Subjects -> BIOLOGY (Total: 3483 journals)
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BIOLOGY (1667 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1720 Journals sorted alphabetically
AAPS Journal     Hybrid Journal   (Followers: 31)
Achievements in the Life Sciences     Open Access   (Followers: 8)
ACS Pharmacology & Translational Science     Hybrid Journal   (Followers: 2)
ACS Synthetic Biology     Hybrid Journal   (Followers: 31)
Acta Biologica Colombiana     Open Access   (Followers: 7)
Acta Biologica Hungarica     Full-text available via subscription   (Followers: 5)
Acta Biologica Sibirica     Open Access   (Followers: 2)
Acta Biologica Turcica     Open Access   (Followers: 1)
Acta Biologica Venezuelica     Open Access  
Acta Biomaterialia     Hybrid Journal   (Followers: 30)
Acta Biotheoretica     Hybrid Journal   (Followers: 3)
Acta Chiropterologica     Full-text available via subscription   (Followers: 6)
acta ethologica     Hybrid Journal   (Followers: 4)
Acta Fytotechnica et Zootechnica     Open Access   (Followers: 1)
Acta Limnologica Brasiliensia     Open Access   (Followers: 4)
Acta Médica Costarricense     Open Access   (Followers: 2)
Acta Musei Silesiae, Scientiae Naturales     Open Access   (Followers: 3)
Acta Neurobiologiae Experimentalis     Open Access  
Acta Parasitologica     Hybrid Journal   (Followers: 12)
Acta Scientiae Biological Research     Open Access   (Followers: 1)
Acta Scientiarum. Biological Sciences     Open Access   (Followers: 2)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis     Open Access   (Followers: 1)
Actualidades Biológicas     Open Access   (Followers: 1)
Advanced Biosystems     Hybrid Journal  
Advanced Health Care Technologies     Open Access   (Followers: 10)
Advanced Journal of Graduate Research     Open Access   (Followers: 1)
Advanced Nonlinear Studies     Hybrid Journal  
Advanced Quantum Technologies     Hybrid Journal  
Advanced Studies in Biology     Open Access   (Followers: 1)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Bioinformatics     Open Access   (Followers: 20)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4)
Advances in Biology     Open Access   (Followers: 12)
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 8)
Advances in Cell Biology/ Medical Journal of Cell Biology     Open Access   (Followers: 30)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 14)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 14)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 7)
Advances in Ecological Research     Full-text available via subscription   (Followers: 44)
Advances in Environmental Sciences - International Journal of the Bioflux Society     Open Access   (Followers: 19)
Advances in Enzyme Research     Open Access   (Followers: 12)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 9)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in High Energy Physics     Open Access   (Followers: 23)
Advances in Human Biology     Open Access   (Followers: 5)
Advances in Life Science and Technology     Open Access   (Followers: 20)
Advances in Life Sciences     Open Access   (Followers: 7)
Advances in Marine Biology     Full-text available via subscription   (Followers: 21)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 26)
Advances in Organ Biology     Full-text available via subscription   (Followers: 2)
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 7)
Advances in Structural Biology     Full-text available via subscription   (Followers: 6)
Advances in Tropical Biodiversity and Environmental Sciences     Open Access   (Followers: 3)
Advances in Virus Research     Full-text available via subscription   (Followers: 6)
Adversity and Resilience Science : Journal of Research and Practice     Hybrid Journal   (Followers: 2)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 12)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
Ageing Research Reviews     Hybrid Journal   (Followers: 12)
Aging Cell     Open Access   (Followers: 26)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat     Open Access  
AJP Cell Physiology     Hybrid Journal   (Followers: 18)
AJP Endocrinology and Metabolism     Hybrid Journal   (Followers: 25)
AJP Lung Cellular and Molecular Physiology     Hybrid Journal   (Followers: 3)
Al-Kauniyah : Jurnal Biologi     Open Access  
Alasbimn Journal     Open Access   (Followers: 2)
Alces : A Journal Devoted to the Biology and Management of Moose     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Biology Teacher     Full-text available via subscription   (Followers: 14)
American Fern Journal     Full-text available via subscription   (Followers: 1)
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 9)
American Journal of Bioethics     Hybrid Journal   (Followers: 16)
American Journal of Human Biology     Hybrid Journal   (Followers: 18)
American Journal of Medical and Biological Research     Open Access   (Followers: 10)
American Journal of Plant Sciences     Open Access   (Followers: 21)
American Journal of Primatology     Hybrid Journal   (Followers: 16)
American Malacological Bulletin     Full-text available via subscription   (Followers: 3)
American Naturalist     Full-text available via subscription   (Followers: 81)
Amphibia-Reptilia     Hybrid Journal   (Followers: 6)
Anadol University Journal of Science and Technology B : Theoritical Sciences     Open Access  
Anadolu University Journal of Science and Technology : C Life Sciences and Biotechnology     Open Access   (Followers: 2)
Anaerobe     Hybrid Journal   (Followers: 4)
Anales de Biología     Open Access   (Followers: 3)
Analytical Methods     Full-text available via subscription   (Followers: 13)
Anatomical Science International     Hybrid Journal   (Followers: 3)
Animal Cells and Systems     Hybrid Journal   (Followers: 5)
Animal Models and Experimental Medicine     Open Access  
Annales de Limnologie - International Journal of Limnology     Hybrid Journal   (Followers: 1)
Annales françaises d'Oto-rhino-laryngologie et de Pathologie Cervico-faciale     Full-text available via subscription   (Followers: 3)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia     Open Access   (Followers: 1)
Annals of Applied Biology     Hybrid Journal   (Followers: 8)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 19)
Annals of Human Biology     Hybrid Journal   (Followers: 6)
Annals of Science and Technology     Open Access  
Annual Research & Review in Biology     Open Access   (Followers: 2)
Annual Review of Biomedical Engineering     Full-text available via subscription   (Followers: 15)
Annual Review of Biophysics     Full-text available via subscription   (Followers: 25)
Annual Review of Cancer Biology     Full-text available via subscription   (Followers: 4)
Annual Review of Cell and Developmental Biology     Full-text available via subscription   (Followers: 42)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 15)
Annual Review of Genomics and Human Genetics     Full-text available via subscription   (Followers: 27)
Annual Review of Phytopathology     Full-text available via subscription   (Followers: 13)
Anthropological Review     Open Access   (Followers: 24)
Antibiotics     Open Access   (Followers: 9)
Antioxidants     Open Access   (Followers: 5)
Antioxidants & Redox Signaling     Hybrid Journal   (Followers: 9)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5)
Anzeiger für Schädlingskunde     Hybrid Journal   (Followers: 1)
Apidologie     Hybrid Journal   (Followers: 5)
Apmis     Hybrid Journal   (Followers: 2)
APOPTOSIS     Hybrid Journal   (Followers: 9)
Applied Biology     Open Access   (Followers: 2)
Applied Bionics and Biomechanics     Open Access   (Followers: 7)
Applied Vegetation Science     Full-text available via subscription   (Followers: 10)
Aquaculture Environment Interactions     Open Access   (Followers: 4)
Aquaculture International     Hybrid Journal   (Followers: 26)
Aquaculture Reports     Open Access   (Followers: 3)
Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society     Open Access   (Followers: 7)
Aquatic Biology     Open Access   (Followers: 8)
Aquatic Ecology     Hybrid Journal   (Followers: 38)
Aquatic Ecosystem Health & Management     Hybrid Journal   (Followers: 16)
Aquatic Science and Technology     Open Access   (Followers: 4)
Aquatic Toxicology     Hybrid Journal   (Followers: 24)
Arabian Journal of Scientific Research / المجلة العربية للبحث العلمي     Open Access   (Followers: 1)
Archaea     Open Access   (Followers: 4)
Archiv für Molluskenkunde: International Journal of Malacology     Full-text available via subscription   (Followers: 3)
Archives of Biological Sciences     Open Access  
Archives of Microbiology     Hybrid Journal   (Followers: 10)
Archives of Natural History     Hybrid Journal   (Followers: 8)
Archives of Oral Biology     Hybrid Journal   (Followers: 3)
Archives of Virology     Hybrid Journal   (Followers: 5)
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2)
Arctic     Open Access   (Followers: 4)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arquivos do Museu Dinâmico Interdisciplinar     Open Access  
Arthropod Structure & Development     Hybrid Journal   (Followers: 2)
Arthropods     Open Access   (Followers: 1)
Artificial DNA: PNA & XNA     Hybrid Journal   (Followers: 3)
Asian Bioethics Review     Full-text available via subscription   (Followers: 4)
Asian Journal of Biodiversity     Open Access   (Followers: 5)
Asian Journal of Biological Sciences     Open Access   (Followers: 3)
Asian Journal of Biology     Open Access   (Followers: 2)
Asian Journal of Biotechnology and Bioresource Technology     Open Access   (Followers: 2)
Asian Journal of Cell Biology     Open Access   (Followers: 6)
Asian Journal of Developmental Biology     Open Access   (Followers: 3)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 5)
Asian Journal of Nematology     Open Access   (Followers: 4)
Asian Journal of Poultry Science     Open Access   (Followers: 5)
Atti della Accademia Peloritana dei Pericolanti - Classe di Scienze Medico-Biologiche     Open Access  
Australian Life Scientist     Full-text available via subscription   (Followers: 2)
Australian Mammalogy     Hybrid Journal   (Followers: 8)
Autophagy     Hybrid Journal   (Followers: 4)
Avian Biology Research     Full-text available via subscription   (Followers: 6)
Avian Conservation and Ecology     Open Access   (Followers: 15)
Bacterial Empire     Open Access   (Followers: 1)
Bacteriology Journal     Open Access   (Followers: 1)
Bacteriophage     Full-text available via subscription   (Followers: 3)
Bangladesh Journal of Bioethics     Open Access  
Bangladesh Journal of Plant Taxonomy     Open Access  
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Batman Üniversitesi Yaşam Bilimleri Dergisi     Open Access  
Berita Biologi     Open Access   (Followers: 1)
Between the Species     Open Access   (Followers: 1)
Bio Tribune Magazine     Hybrid Journal  
BIO Web of Conferences     Open Access  
BIO-Complexity     Open Access  
Bio-Grafía. Escritos sobre la Biología y su enseñanza     Open Access  
Bio-Lectura     Open Access  
BIO-SITE : Biologi dan Sains Terapan     Open Access   (Followers: 1)
Bioanalytical Reviews     Hybrid Journal   (Followers: 2)
Biocatalysis and Biotransformation     Hybrid Journal   (Followers: 6)
BioCentury Innovations     Full-text available via subscription   (Followers: 2)
Biochemistry and Cell Biology     Hybrid Journal   (Followers: 16)
Biochimie     Hybrid Journal   (Followers: 5)
BioControl     Hybrid Journal   (Followers: 5)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 8)
Biodemography and Social Biology     Hybrid Journal  
BIODIK : Jurnal Ilmiah Pendidikan Biologi     Open Access   (Followers: 1)
BioDiscovery     Open Access   (Followers: 2)
Biodiversidade e Conservação Marinha : Revista CEPSUL     Open Access  
Biodiversitas : Journal of Biological Diversity     Open Access  
Biodiversity Data Journal     Open Access   (Followers: 4)
Biodiversity Informatics     Open Access   (Followers: 1)
Biodiversity Information Science and Standards     Open Access   (Followers: 2)
Biodiversity: Research and Conservation     Open Access   (Followers: 27)
Bioedukasi : Jurnal Pendidikan Biologi FKIP UM Metro     Open Access  
Bioeksperimen : Jurnal Penelitian Biologi     Open Access  
Bioelectrochemistry     Hybrid Journal   (Followers: 1)
Bioelectromagnetics     Hybrid Journal   (Followers: 2)
Bioenergy Research     Hybrid Journal   (Followers: 3)
Bioengineering and Bioscience     Open Access   (Followers: 3)
BioEssays     Hybrid Journal   (Followers: 11)
Bioethica     Open Access   (Followers: 3)
Bioethics     Hybrid Journal   (Followers: 18)
BioéthiqueOnline     Open Access  

        1 2 3 4 5 6 7 8 | Last

Similar Journals
Journal Cover
Aquatic Ecology
Journal Prestige (SJR): 0.656
Citation Impact (citeScore): 2
Number of Followers: 38  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-5125 - ISSN (Online) 1386-2588
Published by Springer-Verlag Homepage  [2626 journals]
  • Effect of density and neighbours on interactions between invasive plants
           of similar growth form
    • Abstract: Abstract Invasive aquatic plants constitute a great problem in many freshwater systems. Although many studies have addressed the potential threats of invasion by exotic species in aquatic ecosystems, few studies have considered the interactions (competition, facilitation, coexistence) between exotic aquatic plants of similar growth form in invaded communities. Our aim was to investigate experimentally the effect of density in monocultures and the effect of neighbour identity and plant density on a focal species in mixed cultures. We used Elodea canadensis, Egeria densa and Lagarosiphon major as model species and conducted two experiments, one in a monoculture and another in a mixed culture following an additive design. Individuals were planted in pots with several treatments based on the identity and density of neighbour species. Our results demonstrated that the development of an invasive submerged plant could be influenced either positively (facilitation) or negatively (competition or inhibition) by the presence of more than one neighbour species of different densities. An increase in density significantly stimulated competition intensity, although the effect of density on the performance of the invader also depended on neighbour identity. A facilitative effect of E. canadensis on the apical growth of E. densa was established. However, despite these results, the competitive outcome also depended on other environmental factors (e.g. underwater radiation), not on plant density and neighbour identity alone.
      PubDate: 2020-06-01
       
  • The ecology of the whale shark in Djibouti
    • Abstract: Abstract Within the Gulf of Aden, Djibouti is an important site where whale sharks (Rhincodon typus Smith 1828) aggregate seasonally; however, up to now, only few studies have been carried out in the area (Rowat et al. in Environ Biol Fishes, 2007. https://doi.org/10.1007/s10641-006-9148-7; Mar Freshw Res, 2011. https://doi.org/10.1071/MF10135; Rezzolla and Storai in Cybium 34:195–206, 2010). From 2015 to 2018, whale shark photo-id, skin biopsies, and zooplankton samples were collected to investigate the ecology of this species in Djibouti. Of the 190 photo-identified individuals, the majority were juvenile males, confirming a significant male-based aggregation (X2 = 65, df = 1, p < 0.0001). Within each season, the maximum number of times an individual was re-sighted was 11, while the inter-annual re-sighting rates varied between 11 and 32%. Animals were feeding on surface zooplankton, consisting primarily of copepods (85%); however, Chaetognatha and Ctenophora appeared to be important taxa as well, since the areas most visited were also those with higher concentration of these organisms. Feeding zooplankton patches had a mean biomass of 42.2 ± 31.9 mg m−3, almost 1.5 higher than control stations, indicating that the abundance of this species was positively related to food availability. Furthermore, whale sharks exhibited a clear temporal distribution associated with the variation in zooplankton biomass due to the monsoon winds. Sharks aggregated in October–February, with a peak in sightings in November, and dispersed outside the upwelling season. δ13C values suggested that whale sharks might migrate to other habitats or shift their activities to deeper areas outside the aggregation phase. Little intra-specific variation in δ15N and δ13C was found between animals, suggesting a similar habitat use.
      PubDate: 2020-06-01
       
  • Bottom-up processes control benthic macroinvertebrate communities and food
           web structure of fishless artificial wetlands
    • Abstract: Abstract In freshwater environments, the relative contributions of top-down and bottom-up effects on invertebrate communities in relation to productivity are largely ecosystem dependent. Artificial wetlands are increasingly developed to compensate for the loss of natural wetlands; however, their trophic processes remain poorly studied. The present study aimed to evaluate the respective contributions of bottom-up and top-down processes in structuring benthic food webs of three artificial wetlands with varying levels of benthic primary productivity. We found that phototrophic-based food webs in our artificial wetlands were controlled from the bottom-up by primary productivity and algal biomass developing at the water–sediment interface. No significant top-down control of herbivore species by invertebrate predators was detected even in the wetland with the highest productivity. Increased richness of invertebrate grazers and scrapers with benthic primary productivity and algal biomass might have dampened the trophic cascade from predators to primary producers. In contrast with the phototrophic-based food web, analyses performed on the detritus-based food web showed that deposit-feeder invertebrate abundance was not correlated with the quantity of organic matter in sediments, suggesting no bottom-up effect of sedimentary organic matter content on deposit-feeders. More surprisingly, deposit-feeders, especially aquatic oligochaetes, seemed to influence the detritus-based food webs by stimulating organic matter processing and bacterial growth through bioturbation. The present study highlights the occurrence of contrasting trophic processes between phototrophic-based and detritus-based food webs which can have implications on ecosystem functions, such as nutrient cycling and energy fluxes.
      PubDate: 2020-06-01
       
  • Native Gammarus fossarum affects species composition of macroinvertebrate
           communities: evidence from laboratory, field enclosures, and natural
           habitat
    • Abstract: Abstract Despite the fact that native species of amphipods have been recognized as active predators similarly to invasive species, little is known about their predatory impact on aquatic communities. In this study, we used a laboratory experiment, a field enclosure experiment, and an analysis of natural community data to demonstrate how Gammarus fossarum affects the species composition of benthic communities by imposing survival selection on its prey. Our laboratory single-prey experiment brought a clear evidence that tube-less chironomids are vulnerable prey and that the predation rate on the tube-dwelling chironomids decreases with increasing tube toughness (from the soft tubes made of detritus to the hard tubes made of sand or calcium carbonate grains). We found that the introduction of G. fossarum to field enclosures significantly changed the species composition of a macroinvertebrate community at an experimental spring fen site. The soft-bodied, slow moving, and tube-less taxa were depleted the most. It appears that the observed patterns were a result of predator’s preference rather than encounter rate. Survival selection was detected also in natural communities across a large spatial scale. In accordance with the experiments, high densities of G. fossarum limited the proportion or abundance of vulnerable prey. Our study (1) provides the first convincing evidence that biotic interactions have a structuring effect on the spring fen communities, (2) documents how the predatory effect in a community depends on an interplay between the prey handling behaviour of the predator and species-specific susceptibility of prey, and (3) shows that an omnivorous native amphipod may have a strong impact on aquatic communities despite it is regarded less aggressive than its invasive relatives.
      PubDate: 2020-06-01
       
  • The influence of environmental and spatial factors on benthic invertebrate
           metacommunities differing in size and dispersal mode
    • Abstract: Abstract Understanding the drivers of species distribution is an important topic in conservation biology and ecology, pertaining to species traits like dispersal strategies and species–environment interactions. Here we examined the drivers of benthic species distribution at 20 sections of a second-order stream network. Environmental and spatial factors and the dispersal modes of the organisms were considered. We expected that species with aerial dispersal capabilities like insects would be less restrained by distance between sites and thus mostly affected by environmental factors. In contrast, we hypothesized that completely benthic species would mainly be affected by spatial factors due to limited dispersal. However, microscopic species like nematodes characterized by a high passive dispersal potential may be less limited by spatial factors. When using redundancy analyses and subsequent variance partitioning, the included variables explained 24% (insects), 24% (non-flying macrobenthos), and 32% (nematodes) of the variance in the respective community composition. Spatial factors mainly explained the species composition of all tested groups. In contrast with other larger species, nematodes were characterized by fine-scale patterns that might have been induced by random processes (e.g., random distribution and priority effects). Our study showed that dispersal processes are crucial in shaping benthic communities along streams albeit the relatively small sampling area (max. distance between sampling sites: 2 km). The demonstration of spatial factors as important drivers of the species distribution of passively dispersing benthic organismal groups highlights the role played by connectivity in determining species distribution patterns in river systems.
      PubDate: 2020-06-01
       
  • Non-marine Ostracoda (Crustacea) as indicator species group of habitat
           types
    • Abstract: Abstract To understand interactions between ecological properties of ostracod species and the habitat types, 89 different aquatic bodies with nine different habitat types were randomly visited in Artvin province, Turkey. A total of 24 taxa, all new for the province, were found from 62 sites. Shannon–Weaver alpha diversity of the numbers of species value was higher (3.972) than the mean index value of all samples (2.945) with relatively low standard error (0.264). Six species (Psychrodromus olivaceus, P. fontinalis, Heterocypris incongruens, Potamocypris fulva, P. fallax and Ilyocypris bradyi) encountered most frequently contributed more than 90% of diversity in four different habitat types (lake, creek, trough and canal) of 11 sampling sites. Two positive co-occurrences (p < 0.05) were found for P. olivaceus–I. bradyi, and P. olivaceus–I. inermis. Canonical correspondence analyses explained 60.5% of the variance between 12 asexual species and environmental variables. Water temperature, dissolved oxygen and elevation were the most predictive variables for species found in five different habitats (lake, creek, trough, canal and ditch). Ordination on the first axis of the species negative filter method characterized the sites (samples) by the presence of rare (negative indicators) and common (positive indicator) species in opposite ends. According to TWINSPAN analysis, these species as the key members (indicators) of that particular habitat(s) can be used to distinguish characteristics of habitats. Overall, multiple regression models suggested that rather than focusing on one particular species, two or more ostracod species or the so-called indicator species group can also be used for habitat type(s) and/or aquatic condition(s).
      PubDate: 2020-06-01
       
  • Plant detritus origin and microbial–detritivore interactions affect leaf
           litter breakdown in a Central Apennine (Italy) cold spring
    • Abstract: Abstract The decomposition of dead organic matter is a key process for the metabolism and functioning of lotic ecosystems. Particulate organic matter from fallen leaves is the main source of energy input also in forested springs. However, detritus processing in spring habitats has been rarely investigated. The present paper is aimed to assess, for the first time, the influence of detritus origin on leaf litter breakdown in a hydrologically, thermally and chemically stable cold spring and to evaluate the relative contribution of microorganisms and invertebrate detritivores to the decomposition process. For this purpose, we used leaves of the native black poplar (Populus nigra) and the invasive common reed (Phragmites australis) enclosed in leaf-bags of different mesh sizes. We demonstrated that leaf detritus of native black poplar decomposed twofold faster than the invasive common reed. We also found that the percentage of dry mass loss was significantly higher in medium/coarse litter bags compared to fine ones. However, microorganisms alone in fine mesh bags were able to decompose about 80% (poplar) and 60% (common reed) of the initial dry mass. No substantial differences were detected in structure, composition and functional organization of assemblages colonizing poplar and common reed leaf-bags. Therefore, differences in microbial activity and microbial/detritivore interactions rather than composition, diversity and abundance of the detritivore guild could better explain the faster breakdown of native leaves. Our results suggest that the substitution of natural riparian vegetation with invasive low-quality leaf plant species will have severe impacts on spring ecosystems. Alterations of structural and functional attributes of springs will be strictly related to the specific characteristics of plant invaders and to local conditions which may influence the detritivore/microbial contribution to leaf litter decomposition/breakdown.
      PubDate: 2020-06-01
       
  • The effects of satiation level and competition risk on resource
           acquisition in red swamp crayfish ( Procambarus clarkii )
    • Abstract: Abstract Strategies of resource acquisition are subject to change due to introduced pressures placed upon individual animals. The pressures of food deprivation and competition can lead to a drastic change in previously established strategies of resource acquisition. We conducted a series of trials in which red swamp crayfish (Procambarus clarkii) were either deprived of food or satiated and competition was introduced via a plastic model to necessitate the abandonment of established resource acquisition strategies in favor of risk-insensitive strategies. Crayfish exhibited no difference in behavior when exposed to a singular pressure; however, an interaction between food deprivation and competition was detected and indicates that crayfish responded to food sources more quickly and with more risk-insensitive behavior when a model competitor was present. This combination of factors indicates a complex relationship between resource acquisition strategies and the pressures of acquiring food.
      PubDate: 2020-05-30
       
  • An exploratory study of benthic diatom communities in stormwater ponds of
           different land uses and varying biocide contamination
    • Abstract: Abstract Stormwater retention ponds receive a variety of urban and highway pollutants that may have adverse effects on water-dwelling organisms. In this exploratory study, the benthic diatom community composition at genus level of nine such ponds servicing highway, residential, industrial, and mixed industrial/residential catchments was examined. Thirteen biocides were measured in the pond water as one of the possible explanatory factors for diatom taxonomic variability. The uppermost 1 cm of sediment was sampled, and a total of 50 diatom genera were identified. Moderate to high similarities were found among the diatom communities of the ponds. Two genera, namely Navicula and Nitzschia, were the most abundant and accounted for 19–47% of the relative abundance in the ponds. Estimated relative abundances of diatom genera and measured biocide concentrations in the ponds were grouped according to land use. Highway ponds were found to be significantly different from ponds servicing residential and industrial catchments, while no significant differences were found between residential and industrial ponds. The presence of biocides alone could not explain diatom taxonomic variability, although some evidence was found that communities differed depending on the catchment type of the ponds. The results of this exploratory study are an important contribution to future works investigating stormwater diatom communities, where combined effects of biocides and other stormwater contaminants and community stressors, e.g., metals, PAHs, road salt, should be explicitly looked at.
      PubDate: 2020-05-23
       
  • Age matters: substrate-specific colonization patterns of benthic
           invertebrates on installed large wood
    • Abstract: Abstract Large wood (LW) is an indispensable element in riverine ecosystems, especially in lower river parts. The presence of LW significantly shapes local hydraulics, morphology, the nutrient budget; promotes overall river dynamics; and additionally presents a unique habitat for numerous benthic invertebrate species. Therefore, LW is recognized as valuable asset for river restoration measures. Experiences from previous projects show that ecological responses on LW implementation measures vary greatly. That complicates comparisons and estimations on the success of planned measures. Methodological inconsistencies and thus reduced transferability of the results is one major issue. Additionally, wood quality aspects are suspected to be important factors affecting benthic invertebrate colonization patterns. The focus of this study is therefore to consistently assess the ecological significance of installed LW and concrete samples of similar size and shape in terms of benthic invertebrate colonization and to further test, if the condition of wood affects the benthic invertebrate colonization. Our results show that (1) installed LW serves as an abundantly and heterogeneously colonized habitat, (2) the state of decay of LW pieces significantly affects benthic invertebrate colonization in terms of density and diversity and (3) even rare or threatened taxa closely associated to LW were abundantly present on the installed logs, emphasizing the suitability of the chosen approach.
      PubDate: 2020-05-06
       
  • Current environmental conditions are weak predictors of fish community
           structure compared to community structure of the previous year
    • Abstract: Abstract Predicting fish community structure in streams is a challenge considering the strong dynamics of these environments. In this study, we tested whether using a fish dataset obtained in a previous time was relevant to predict fish community structure in a subsequent time. We also tested whether temporal beta diversity of fish communities was correlated with environmental variability, stream size and order. To test these hypotheses, we collected data on fish communities, environmental and spatial variables from 15 streams in the Rio das Mortes Basin (Mato Grosso State, Brazil) in two consecutive drought periods (in 2016 and 2017). The gradients in fish richness and abundance were correlated between years. The results of a variation partitioning analysis indicated that the fish community structure in 2016 was the main explanatory matrix of the fish community structure in 2017 (when compared to environmental and spatial variables). A variation partitioning analysis, based only on environmental and spatial variables, showed a much higher residual variation. We did not detect significant relationships between fish temporal beta diversity and our explanatory variables. Our results indicate that our predictive power may be substantially increased by using data on past communities as explanatory variables. This is a viable analytical strategy because long-term studies are becoming more frequent. Temporal autocorrelation analyses of community data can also be useful to evaluate priority effects. In addition, these analyses can help plan biomonitoring programs. The second part of the results indicates, however, that our ability to predict temporal beta diversity is still limited.
      PubDate: 2020-05-02
       
  • Shading may alter the colonization pattern and dominance between two
           invasive submerged aquatic plant species
    • Abstract: Abstract Egeria densa and Elodea canadensis are two common invasive submerged macrophytes in streams and rivers worldwide. We conducted a six-week growth experiment with monocultures of E. densa and E. canadensis and mixed communities of the two species under five different shade levels (35%, 63%, 79%, 90% and 95%). Our aim was to test the effect of shade and competition on colonization of vegetative propagules of these species in flowing waters. We found that biomass accrual in both species was greatly reduced at high shade (≥ 79%) and that E. densa individuals accrued more biomass than E. canadensis individuals at all shade levels. At the least shade level (35%), interspecific competition with E. densa stimulated biomass accrual of E. canadensis individuals, compared to those within an E. canadensis monoculture. At higher shade (≥ 63%), this facilitation response disappeared, although E. canadensis plants continued to have longer stem length and a greater degree of branching than E. densa plants at ≤ 79% shade. At the highest shade level, competition with E. canadensis reduced biomass accrual of E. densa. Hence, shade influenced the competitive interactions between these two species. At low shade, the competitiveness of E. canadensis was enhanced, but in the field E. densa appears to be the dominant species in streams, especially those with higher levels of shade and less frequent disturbance by flushing flow events.
      PubDate: 2020-04-19
       
  • Spatial patterns of abundance and shell morphology of two gastropod
           species associated with different morphologies of an intertidal seaweed
    • Abstract: Abstract Patterns of abundance and shell morphology of intertidal gastropods are typically thought to depend on environmental conditions, but ecosystem engineers such as canopy-forming seaweeds can also influence these traits. The intertidal seaweed Hormosira banksii (H. banksii) is an abundant species and important ecosystem engineer on rocky shores and estuaries in south-east Australia, where it creates thick canopies colonized by a range of invertebrates, particularly gastropods. In Tasmania (southern Australia), H. banksii shows large variability in thallus length and structure, with different algal morphologies on coasts and in estuaries. In this study, individuals of two gastropod species were sampled from different habitats (north coast, east coast and northern estuaries) to: (1) describe the spatial variability in their abundance and shell morphology, and (2) understand if any relationship exists between H. banksii morphology and gastropod shell morphology. Gastropod abundance and morphology were variable, but multivariate analysis suggested a marginal influence of H. banksii morphological traits, particularly vesicle size, on the patterns observed. As the two gastropod species use habitat differently and that different H. banksii morphs occur in different locations, our results suggest that both algal morphology and environmental conditions may affect gastropod abundance and shell morphology across the different habitats. Hence, from these results a model can be developed and tested in subsequent experimental work to tease apart the effects of seaweed morphology from environmental conditions.
      PubDate: 2020-03-11
       
  • New climate regime started and further shaped the historic Yellowstone
           Lake cutthroat trout population decline commonly attributed entirely to
           nonnative lake trout predation
    • Abstract: Abstract The storied Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri; YCT) population of Yellowstone Lake, Yellowstone National Park, Wyoming, USA, has shown a profound and mostly continuous decline since the 1970s despite pristine habitat and vanishing angler harvests. An age-structured Leslie model that had a broad climate index as its only driver (regulating age-0 YCT survival) was Bayesian-fitted to data for a key YCT spawning stock from 1977 to 1992, arguably before predation from an introduced lake trout (Salvelinus namaycush) population (1994 discovery) measurably affected YCT population dynamics. The middle 50% of model fits encompassed 12 of 14 observed spawning populations and nominally excluded the others. Forecasting to 2007 (the final empirical data year) showed the new climate regime largely explained declining YCT numbers, but a growing predation effect became evident soon after lake trout discovery and quickly became the major YCT population driver. The climate effect may have involved the fatal blockage of out-emigrating YCT fry by natural alluvial deposits at spawning tributary mouths in warm, dry years. The previously reported Yellowstone Lake ecosystem shift suggested by the YCT population decline actually began with the 1977 North Pacific Basin climate shift and was only later enhanced by lake trout predation. This study showed identifying and accounting for the overarching population drivers is important to structuring statistical models intended to detect and assess the effects of new and emerging population impacts across historic data sets. Management actions intended to protect these YCT must consider climate effects and probable future climates.
      PubDate: 2020-03-07
       
  • Phenotype changes of cyanobacterial and microbial distribution
           characteristics of surface sediments in different periods of
           cyanobacterial blooms in Taihu Lake
    • Abstract: Abstract This study investigates the morphological changes in cyanobacterial and microbial distribution characteristics of surface sediments, throughout different cyanobacterial blooms periods in Zhushan Bay, Taihu Lake. Comparative microscopic analysis of cyanobacterial morphology (n = 36) was performed during the formation period (W1), stationary period (W2), decline period (W3) and decomposition period (W4). Simultaneously, sequence analysis was performed on microbial 16S rRNA genes in sediments (n = 36) by high-throughput sequencing. The coverage of the sequencing library was very high (100%) indicating that the sequencing results well represented the microbes present in samples, among which the species richness in W4 was the highest, while the species distribution uniformity was low. The microbial abundance distribution in all four periods showed that Firmicutes (33.45%), Cyanobacteria (30.44%), Proteobacteria (27.17%) and Bacteroidetes (7.2%) were the dominant flora, with W1 dominated by Cyanobacteria, W2 dominated by Firmicutes, W3 dominated by Proteobacteria and Cyanobacteria, and W4 dominated by Proteobacteria. There were significant differences in microbial species abundance and distribution observed during each cyanobacterial bloom period and synchronous microorganisms in the sediment regulated bacterial abundance and distribution through signal transduction of various proteases. The findings of this study help to establish the impact of cyanobacteria blooms on the sediment environment and benefit the comprehensive assessment of hazard presented by cyanobacteria to the aquatic environment.
      PubDate: 2020-03-06
       
  • Size-fractioned aggregates within phycosphere define functional bacterial
           communities related to Microcystis aeruginosa and Euglena sanguinea blooms
           
    • Abstract: Abstract Phytoplankton growth and degradation are associated with bacterial communities in phycosphere. We compared the bacterial communities in two algal blooms (Microcystis aeruginosa and Euglena sanguinea). In particular, large particle-associated, small particle-associated, and free-living bacteria were collected in succession using membranes with three different pore sizes (10 µm, 1 µm, and 0.22 µm) in this study. The results showed that Proteobacteria and Bacteroidetes were the dominant phyla in both blooms. Significant differences in the structure, function, and assembly were observed between large particle-associated and free-living bacterial community in both blooms. Specifically, relative abundance of Roseomonas was higher in the large-size (> 10 µm) aggregates, while Candidate_division_TM7 and Candidate_division_SR1 were more abundant in the free-living bacterial community (0.22–1 µm). The large particle-associated bacterial community was mainly driven by heterogeneous selection and dispersal limitation, whereas the small particle-associated and free-living bacterial communities were mostly determined by dispersal limitation. Besides, some specific bacterial subgroups were found between M. aeruginosa and E. sanguinea blooms. Chlorobi, Chloroflexi, and Fusobacteria were abundant in the M. aeruginosa blooms, whereas Deinococcus–Thermus was abundant in the E. sanguinea blooms. Those specific bacteria provide competitive advantages for the dominated algae. Altogether, these findings indicate that the phycosphere of bloom-forming algae provides different ecological niches where different functional bacterial groups can adapt.
      PubDate: 2020-03-05
       
  • Cyanobacteria and cyanotoxins in estuarine water and sediment
    • Abstract: Abstract While transfer of freshwater cyanobacteria to estuaries has been observed worldwide, the associated transfer of cyanotoxins is less often reported, in particular the sediment contribution. During fall 2018, we monitored the co-occurrence of cyanobacteria and microcystin (MC) in both the water column and in surface sediments at five stations along a river continuum, from a freshwater reservoir to the coastal area in Brittany, France. Cyanobacteria dominated the phytoplankton community in the water column with high densities at the freshwater sites. Microcystis cells and intracellular MC transfer to estuarine and marine sites were observed with decreasing concentrations in accordance with flow dilution. Extracellular MC showed the opposite trend and increased from upstream to downstream in accordance with the lysing of the cells at elevated salinities. Surface sediment samples contained high densities of colonial Microcystis in freshwater and with decreasing concentrations along the salinity gradient, similar to cells concentrations in the water column. Intracellular MC was detected in sediment at all sites except at the marine outlet suggesting the survival of intact cells. Extracellular MC concentrations in sediment were up to five times higher than intracellular concentrations suggesting incomplete MC degradation. mcyB genes were present at all sites, while mcyA genes were absent at the marine outlet suggesting the presence of toxic strains along the estuary. The high densities of intact colonies of potentially toxic Microcystis in the estuarine sediment strongly suggest that sediments can act as an inoculum of cyanobacteria and cyanotoxins in estuaries.
      PubDate: 2020-03-04
       
  • Cyanobacteria in an urban lake: hidden diversity revealed by metabarcoding
    • Abstract: Abstract The study and monitoring of communities within microbiomes is important as some organisms can synthesize toxic substances, such as cyanotoxins synthesized by cyanobacteria. Cyanobacteria is a large portion of the periphyton biomass and is responsible for toxic blooms in aquatic environments. This makes urban environments an interesting environment for observing cyanobacteria diversity, due to the disturbances from anthropic activities. As many classes of cyanobacteria are difficult to identify using traditional morphology methods, the use of molecular tools could complement periphyton community studies. Herein, we use the hypervariable V4 region of 16S rRNA gene to observe cyanobacteria diversity in the periphyton from an urban lake. After DNA extraction and metabarcoding analyses, the reads were classified according to the SILVA database, and the cyanobacteria operational taxonomic units (OTUs) were separated to compare with the GenBank database. Most of the cyanobacteria OTUs obtained in this study do not correspond to cyanobacteria previously found in this environment by traditional methods, and our GenBank comparison generated significantly improved taxonomic assignments. Metabarcoding is a useful tool and has allowed our first step toward understanding the true cyanobacteria diversity in the periphyton community of urban lakes.
      PubDate: 2020-03-03
       
  • Exploring the distribution patterns of macroinvertebrate signature traits
           and ecological preferences and their responses to urban and agricultural
           pollution in selected rivers in the Niger Delta ecoregion, Nigeria
    • Abstract: Abstract Macroinvertebrate signature traits’ and ecological preferences’ distribution patterns and their responses to urban and agricultural pollution were explored in rivers-draining urban–agricultural catchments within the Niger Delta ecoregion of Nigeria. Physico-chemical variables (water temperature, electrical conductivity, depth, flow velocity, dissolved oxygen, biochemical oxygen demand, nitrates and phosphates) were sampled alongside macroinvertebrates in 17 sites of 11 rivers for a period of five years (2008–2012). Physico-chemically based classification using principal component analysis classify selected sites into least impacted sites (LIS), moderately impacted sites (MIS) and heavily impacted sites (HIS). The results based on RLQ [physico-chemical variables (R), macroinvertebrate taxa (L) and traits and ecological preferences (Q)] and fourth-corner analyses showed that preference for permanent attachment, high sensitivity to oxygen depletion, moderate sensitivity to oxygen depletion and large body size (> 20–40 mm) which were associated with LIS were also positively correlated with DO; thus, they were deemed sensitive to urban–agricultural pollution. Detritus (CPOM) and very small body size (< 5 mm) that were associated with HIS were deemed tolerant to urban–agricultural pollution. Box plots and Kruskal–Wallis test revealed that all sensitive traits and ecological preferences were not significantly different between LIS, MIS and HIS (p > 0.05) except for large body size, while tolerant traits CPOM and very small body size were significantly highest at HIS (p < 0.05). Generally, the study observed differential patterns in the distribution of traits and ecological preferences to urban–agricultural pollution.
      PubDate: 2020-03-03
       
  • Marine soundscape and fish chorus in an archipelago ecosystem comprising
           bio-diverse tropical islands off Goa Coast, India
    • Abstract: Abstract Many biological sources of sound in tropical coastal shallow-water marine environments remain unidentified. Characterizing the soundscape of such environments requires that all sources of biological sound be examined for their distinct patterns and specific frequency ranges. The present study identified soniferous fish in the ecosystem and measured underwater ambient sound in terms of its sound pressure levels (SPL) to quantify and characterize their contribution to the soundscape. Underwater SPLs were measured from 2012 to 2016 at a site near Grande Island Archipelago (15° 18′ N, 73° 41′ E) 18 km off the coast of the state of Goa, which lies along India’s western coast. Acoustic data were recorded using three types of methods for passive acoustic monitoring, namely a hanging hydrophone, five seabed-mounted hydrophones and an autonomous moored vertical hydrophone. Underwater visual census at the site revealed that both species richness and diversity were high indicating the Grande Island Archipelago is a bio-diverse site. The seabed-mounted hydrophones proved to be the best choice for long-term SPL measurements, although the moored arrays were more economical. Ambient sound levels underwater varied markedly over time both within a day and with the season. Long-term SPLs were above 100 dB re 1 μPa over frequencies 62.5–8000 Hz and peaked to 120–130 dB re 1 μPa between frequencies 500 Hz and 1000 Hz, corresponding to the chorus frequencies of soniferous fish at the site. High SPLs and marked temporal variations of the soundscape indicate the abundance, diversity and life activities of fish species and healthy ecological state of the bio-diverse archipelago.
      PubDate: 2020-03-02
       
 
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