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  Subjects -> BIOLOGY (Total: 3308 journals)
    - BIOCHEMISTRY (255 journals)
    - BIOENGINEERING (129 journals)
    - BIOLOGY (1576 journals)
    - BIOPHYSICS (49 journals)
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    - BOTANY (245 journals)
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    - ORNITHOLOGY (28 journals)
    - PHYSIOLOGY (72 journals)
    - ZOOLOGY (143 journals)

BIOLOGY (1576 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1720 Journals sorted alphabetically
AAPS Journal     Hybrid Journal   (Followers: 29)
Achievements in the Life Sciences     Open Access   (Followers: 7)
ACS Pharmacology & Translational Science     Hybrid Journal   (Followers: 1)
ACS Synthetic Biology     Hybrid Journal   (Followers: 25)
Acta Biologica Colombiana     Open Access   (Followers: 7)
Acta Biologica Hungarica     Full-text available via subscription   (Followers: 4)
Acta Biologica Sibirica     Open Access   (Followers: 2)
Acta Biologica Turcica     Open Access  
Acta Biologica Venezuelica     Open Access  
Acta Biomaterialia     Hybrid Journal   (Followers: 29)
Acta Biotheoretica     Hybrid Journal   (Followers: 4)
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: 1)
Acta Neurobiologiae Experimentalis     Open Access  
Acta Parasitologica     Hybrid Journal   (Followers: 11)
Acta Scientiarum. Biological Sciences     Open Access   (Followers: 2)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis     Open Access   (Followers: 1)
Actualidades Biológicas     Open Access   (Followers: 1)
Advanced Health Care Technologies     Open Access   (Followers: 8)
Advanced Journal of Graduate Research     Open Access  
Advanced Nonlinear Studies     Hybrid Journal  
Advanced Studies in Biology     Open Access  
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 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: 13)
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: 17)
Advances in Enzyme Research     Open Access   (Followers: 11)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 8)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in High Energy Physics     Open Access   (Followers: 22)
Advances in Human Biology     Open Access   (Followers: 4)
Advances in Life Science and Technology     Open Access   (Followers: 18)
Advances in Life Sciences     Open Access   (Followers: 6)
Advances in Marine Biology     Full-text available via subscription   (Followers: 21)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 25)
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 Regenerative Biology     Open Access   (Followers: 2)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 6)
Advances in Structural Biology     Full-text available via subscription   (Followers: 5)
Advances in Tropical Biodiversity and Environmental Sciences     Open Access   (Followers: 1)
Advances in Virus Research     Full-text available via subscription   (Followers: 6)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 8)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 2)
Ageing Research Reviews     Hybrid Journal   (Followers: 12)
Aging Cell     Open Access   (Followers: 25)
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: 24)
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 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: 14)
American Journal of Human Biology     Hybrid Journal   (Followers: 16)
American Journal of Medical and Biological Research     Open Access   (Followers: 10)
American Journal of Plant Sciences     Open Access   (Followers: 20)
American Journal of Primatology     Hybrid Journal   (Followers: 17)
American Malacological Bulletin     Full-text available via subscription   (Followers: 3)
American Naturalist     Full-text available via subscription   (Followers: 80)
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)
Analytical Methods     Full-text available via subscription   (Followers: 12)
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: 7)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 19)
Annals of Human Biology     Hybrid Journal   (Followers: 5)
Annals of Science and Technology     Open Access  
Annual Review of Biomedical Engineering     Full-text available via subscription   (Followers: 14)
Annual Review of Biophysics     Full-text available via subscription   (Followers: 25)
Annual Review of Cancer Biology     Full-text available via subscription   (Followers: 3)
Annual Review of Cell and Developmental Biology     Full-text available via subscription   (Followers: 39)
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: 25)
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: 4)
Apmis     Hybrid Journal   (Followers: 1)
APOPTOSIS     Hybrid Journal   (Followers: 9)
Applied Biology     Open Access   (Followers: 1)
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: 6)
Aquatic Ecology     Hybrid Journal   (Followers: 37)
Aquatic Ecosystem Health & Management     Hybrid Journal   (Followers: 15)
Aquatic Science and Technology     Open Access   (Followers: 3)
Aquatic Toxicology     Hybrid Journal   (Followers: 23)
Archaea     Open Access   (Followers: 3)
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: 9)
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)
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: 3)
Asian Journal of Biodiversity     Open Access   (Followers: 5)
Asian Journal of Biological Sciences     Open Access   (Followers: 3)
Asian Journal of Cell Biology     Open Access   (Followers: 5)
Asian Journal of Developmental Biology     Open Access   (Followers: 2)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 4)
Asian Journal of Nematology     Open Access   (Followers: 4)
Asian Journal of Poultry Science     Open Access   (Followers: 4)
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: 7)
Autophagy     Hybrid Journal   (Followers: 4)
Avian Biology Research     Full-text available via subscription   (Followers: 5)
Avian Conservation and Ecology     Open Access   (Followers: 13)
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  
Bioanalytical Reviews     Hybrid Journal   (Followers: 2)
Biocatalysis and Biotransformation     Hybrid Journal   (Followers: 6)
BioCentury Innovations     Full-text available via subscription   (Followers: 1)
Biochemistry and Cell Biology     Hybrid Journal   (Followers: 16)
Biochimie     Hybrid Journal   (Followers: 6)
BioControl     Hybrid Journal   (Followers: 6)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 8)
Biodemography and Social Biology     Hybrid Journal  
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: 26)
Bioedukasi : Jurnal Pendidikan Biologi FKIP UM Metro     Open Access  
Bioeksperimen : Jurnal Penelitian Biologi     Open Access  
Bioelectrochemistry     Hybrid Journal   (Followers: 2)
Bioelectromagnetics     Hybrid Journal   (Followers: 2)
Bioenergy Research     Hybrid Journal   (Followers: 3)
Bioengineering and Bioscience     Open Access   (Followers: 2)
BioEssays     Hybrid Journal   (Followers: 11)
Bioethics     Hybrid Journal   (Followers: 16)
BioéthiqueOnline     Open Access  
Biofabrication     Hybrid Journal   (Followers: 5)
Biofilms     Full-text available via subscription   (Followers: 1)
Biogeosciences (BG)     Open Access   (Followers: 11)
Biogeosciences Discussions (BGD)     Open Access   (Followers: 3)
Bioinformatics     Hybrid Journal   (Followers: 378)
Bioinformatics and Biology Insights     Open Access   (Followers: 12)
Bioinspiration & Biomimetics     Hybrid Journal   (Followers: 7)
Biointerphases     Open Access   (Followers: 1)
Biojournal of Science and Technology     Open Access  
BioLink : Jurnal Biologi Lingkungan, Industri, Kesehatan     Open Access   (Followers: 1)
Biologia     Hybrid Journal  
Biologia on-line : Revista de divulgació de la Facultat de Biologia     Open Access  
Biological Bulletin     Partially Free   (Followers: 6)
Biological Control     Hybrid Journal   (Followers: 8)
Biological Invasions     Hybrid Journal   (Followers: 24)

        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: 37  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-5125 - ISSN (Online) 1386-2588
Published by Springer-Verlag Homepage  [2574 journals]
  • Correction to: Impacts of ocean acidification on hermit crab communities
           through contrasting responses of Pagurus filholi (de Man, 1887) and
           Clibanarius virescens (Krauss, 1843)
    • Abstract: Figure 2 has been published incorrectly in the original publication of the article.
      PubDate: 2019-12-01
       
  • Effects of the exotic rotifer Kellicottia bostoniensis (Rousselet, 1908)
           on the microbial food web components
    • Abstract: Species introduction can alter the structure and dynamics of biological communities and, therefore, understanding their feeding behavior and the effects that an exotic species can cause in the food web configuration is pivotal. We aimed to experimentally investigate the effects of the potential invasive species Kellicottia bostoniensis on different components of the microbial food web and to evaluate if the food preferences of this species change under different conditions of resource availability and interspecific interactions. We tested the hypothesis that the presence of K. bostoniensis would have direct and indirect effects on the different components of the planktonic food web. We designed three different assays (E) using prey size fractionation, being E1 composed of bacteria (HB) and picophytoplankton (PPP), E2 composed of HB, PPP and autotrophic and heterotrophic flagellates and, E3 with the whole planktonic community. Each one composed of a control in the absence of K. bostoniensis and a treatment with the presence of this species. Results showed that K. bostoniensis caused direct effects on its main food items, the heterotrophic and autotrophic flagellates, whereas no evidence of indirect effects was observed on the base components of the microbial web food, such as heterotrophic bacteria and picophytoplankton. In addition, a negative effect of the exotic rotifer on ciliates was observed. Finally, we emphasize that the impact of K. bostoniensis on aquatic ecosystem may be quite harmful, since this specie can act as a sink of matter and energy to higher trophic levels.
      PubDate: 2019-12-01
       
  • Spatial variation in the feeding strategies of Mediterranean fish:
           flatfish and mullet in the Gulf of Gaeta (Italy)
    • Abstract: Marine coastal areas are highly productive due to the presence of various inputs of organic matter, including terrestrial material, which fuels food webs. However, the ecological mechanisms underlying the productivity of benthic and demersal fish species in estuarine areas are poorly understood. By means of C and N stable isotope analysis and Bayesian mixing models, we investigated the trophic niches of three common fish species: Citharus linguatula, Pegusa lascaris (flatfish) and Liza ramada (mullet) in the Gulf of Gaeta (Italy). Fish were collected from the north-western area and the south-eastern area of the Gulf of Gaeta, the latter affected by organic inputs from the Garigliano River. The results highlighted the riverine terrestrial origin of the organic matter at the base of the food web in the south-eastern area and marine autochthonous input in the north-western area. All fish species increased their trophic specialisation in proximity to the river mouth. L. ramada specialised on seston of terrestrial origin, reducing its niche overlap with C. linguatula and P. lascaris. Away from the river mouth, all species were characterised by longer individuals, increased intraspecific diet variability and higher interspecific similarity in resource use. Organic input from the river represented a complementary trophic niche axis that enabled lower interspecific niche overlap in the south-eastern area, where fish populations were found at higher densities. In conclusion, this study provided information about the effects of the flow of material from the basal compartment up to abundant fish species in areas enriched by organic matter of varying origin.
      PubDate: 2019-12-01
       
  • How far may life venture' Observations on the harpacticoid copepod
           Phyllognathopus viguieri under extreme stress conditions
    • Abstract: The authors report the first finding of living specimens of the harpacticoid copepod Phyllognathopus viguieri (Maupas, 1892) in the gut content of the teleost fish Merluccius merluccius (Linnaeus, 1758), and their extraordinary viability after the M. merluccius specimens had been stored at − 20 °C for more than 1 month and their stomachs been preserved in 70% ethanol for a further month. After their survival for such a long time in such harsh conditions, P. viguieri, after a few minutes of total immobilization, began to swim actively and fast, and after being reared in freshwater or seawater in Petri dishes under starvation, these animals reproduced, and the presence of nauplii, copepodids and adults which completed the whole life cycle in 3/5 days was observed in freshwater and seawater, respectively. The occurrence of P. viguieri in the stomach of a true marine demersal fish species enlarges the known habitat types the species may stably colonize. The potential for dormancy in fertilized adult females to escape adverse environmental conditions is hypothesized.
      PubDate: 2019-12-01
       
  • Impacts of ocean acidification on hermit crab communities through
           contrasting responses of Pagurus filholi (de Man, 1887) and Clibanarius
           virescens (Krauss, 1843)
    • Abstract: Ocean acidification (OA) is predicted to decrease the abundance of calcified organisms such as gastropods. Since hermit crabs utilize gastropod shell as mobile shelter, OA has indirect impacts on hermit crab population. To examine the impacts of OA on hermit crab communities, which use calcified shell as the mobile shelter, we conducted field surveys and laboratory experiments using volcanic CO2 seeps in Shikine Island, Japan. By comparing hermit crab community structures and shell availability among five intertidal rocky shores with different degrees of acidification, Paguroidea abundance and species richness were simplified in acidified areas. Rearing experiments comparing survival rates of two Paguroidea species, Pagurus filholi (de Man, 1887) and Clibanarius virescens (Krauss, 1843), at both adult and larval stages, between acidified and ambient aquaria revealed that acidified seawater reduced larval survival rate of C. virescens. Overall, the results indicated that the species-specific direct effect in elevated C. virescens larval mortality could simplify the Paguroidea species composition. In addition, such direct effect would also lead to reduction of Paguroidea abundance, along with indirect effects though a decrease in shell availability.
      PubDate: 2019-12-01
       
  • Trophic ecology of benthic fish assemblages in a lowland river in the
           Brazilian Amazon
    • Abstract: Studies on the trophic ecology of fish have revealed considerable alimentary plasticity for the majority of ichthyofauna in tropical rivers. This leads to the prediction that diet reflects the availability of food in the environment, namely seasonal variation in the abundance and type of food resources. To examine this, we assess: (1) seasonal variation in the diet and trophic structure of assemblages of benthic fish inhabiting the main channel of a large floodplain river in the Brazilian Amazon, (2) seasonal changes in the availability of food resources, (3) the trophic response (food selectivity) of benthic species in relation to food availability and (4) niche overlap among benthic species. Data were collected during 2 rising and 2 receding phases. Aquatic insects, plant matter and detritus were the predominant items in the diet of assemblages of benthic fish. The majority of fish species changed their diet between seasons. The diets of Exallodontus aguanai and Sternarchella calhamazon were studied in detail and showed positive correlation with food resource availability. Feeding selectivity varied among seasons for these two species. Niche overlap between these two species was observed during only one receding season. Our results reveal the importance of aquatic insects in the predominantly omnivorous diet of the benthic fish assemblages. Trophic plasticity was also evident, possibly because of the seasonal availability of food items. These results underline the role that organic matter derived from floodplains plays in this aquatic system which is characterised as having naturally low autochthonous productivity.
      PubDate: 2019-12-01
       
  • On the environmental background of aquatic organisms for ecological niche
           modeling: a call for caution
    • Abstract: Ecological niche modeling (ENM) is a technique widely used in many disciplines of science. Recently, the extent of using the environmental background for ENM calibration has been pointed out as playing a crucial role in determining model outcomes. However, when modeling freshwater species, the need for a background refinement has been ignored and its consideration possesses important implications not taken into account before. Here, using Maxent algorithm and global occurrence data characterizing the distribution of the invasive freshwater turtle, Trachemys scripta, we performed ENM transfer and compared native and invasive niche estimates for the species in the environmental space. We used two environmental backgrounds: (a) a traditional area, based on the current distribution and dispersal capacity of the species, and (b) a more restricted area, which corresponds exclusively to freshwater bodies. Our analysis revealed strong differences between the traditional and the restricted backgrounds in niche transferability, with differences in Maxent probability values ranging from − 0.59 to 0.41. Also, during comparisons between native and invasive niches, the niches were more similar when the traditional approach was used, compared to the restricted approach. Our results highlight the importance of considering the biological restriction of the species when establishing the extent of the background in ecological niche modeling; in this case, a more restricted area represented by freshwater environments.
      PubDate: 2019-12-01
       
  • Water bears dominated cryoconite hole ecosystems: densities, habitat
           preferences and physiological adaptations of Tardigrada on an alpine
           glacier
    • Abstract: We investigated the Forni Glacier and the surrounding area in the Alps in terms of habitat preferences, densities, dispersal and desiccation tolerance of glacier tardigrades, which are one of the most common faunal representatives and top consumers in supraglacial ecosystems. To do so, we sampled supraglacial environments (cryoconite holes, debris from ice surface, dirt cones and moraine, mosses from supraglacial stones) and non-glacial habitats (mosses, freshwater sediments and algae), and we installed air traps on the glacier and the nearby area. We found that cryoconite holes on the Forni Glacier are exclusively dominated by one metazoan group of tardigrades, representing one species, Hypsibius klebelsbergi (identified by morphological and molecular approaches). Tardigrades were found in 100% of cryoconite holes and wet supraglacial sediment samples and reached up to 172 ind./ml. Additionally, we found glacier tardigrades in debris from dirt cones and sparsely in supraglacial mosses. Glacier tardigrades were absent from freshwater and terrestrial samples collected from non-glacial habitats. Despite the fact that H. klebelsbergi is a typical aquatic species, we showed it withstands desiccation in sediments, but in low temperatures only. Treatments conducted in higher temperatures and water only showed low or no recovery. We suspect successful dispersal with wind might have taken place only when tardigrades desiccated in sediments and were passively transported by cold wind. Limited ability to withstand high temperatures and desiccation may be potential barriers preventing glacier tardigrades inhabiting new, even apparently suitable high mountain water bodies like temporary rock pools.
      PubDate: 2019-12-01
       
  • Occurrence and habitat use of European eel ( Anguilla anguilla ) in
           running waters: lessons for improved monitoring, habitat restoration and
           stocking
    • Abstract: To improve the management of the European eel (Anguilla anguilla) in freshwater, it is essential to define important lotic habitats. Electrofishing data from 289 wadeable, hard-bottom sites in 69 Swedish coastal rivers and streams, originally surveyed for salmonid monitoring, were used to evaluate the effects of sampling- and habitat-related factors on eel occurrence. Probability of eel occurrence, as influenced by sampling procedure (sampled area, number of consecutive runs and ambient water temperature) and habitat characteristics (size of catchment, dominating bottom substrate, shade, water velocity, mean depth), was evaluated for small (total length ≤ 150 mm) and large (> 150 mm) yellow eels. Data were analysed in a mixed presence/absence generalized linear model with dispersal (distance to mouth from sampled site), habitat and sampling-related variables as covariates. The two models explained variation in occurrence to 81.5% for small eel and 76.2% for large eel. Probability of eel occurrence decreased with distance from the river mouth, and increased with sampled area, number of runs, water temperature, coarser substrate and size of river. We suggest that future eel habitat restoration should focus on lower reaches of larger rivers with suitable coarse bottom habitats. Stocking of young eel should be carried out in comparable accessible habitats in the upper reaches where eel densities are low. The results also strongly indicate that eel may be sampled together with young salmonids with DC electrofishing in wadeable habitats.
      PubDate: 2019-12-01
       
  • Hierarchy of factors controls denitrification rates in temperate
           intermittently closed and open coastal lakes/lagoons (ICOLLS)
    • Abstract: Intermittently closed and open lakes/lagoons (ICOLLs) can occur in alternate stable states: clear and turbid, with nitrogen inputs from high-intensity agricultural land use often fuelling phytoplankton growth in ICOLLs. Due to their limited water exchange, ICOLLs are particularly susceptible to eutrophication. In these environments, denitrification may remove a substantial proportion of the land-derived nitrogen load, reducing their vulnerability to eutrophication; however, the factors that influence denitrification in ICOLLs are poorly understood. In this study, we addressed the relative importance of physico-chemical and biotic factors related to nitrate-saturated denitrification rates (including temperature, nutrient/organic matter supply, oxygen conditions, sediment type and benthic macroinvertebrates) in two eutrophic ICOLL ecosystems: one supports some submerged macrophytes, while the other is in a persistent, turbid, phytoplankton-dominated system. Flexible in situ enclosures and denitrification enzyme assay measurements were employed to determine denitrification rates in response to new nitrate pulses, which are commonly observed in these systems. In situ denitrification rates were inhibited in both ICOLLs in winter, whereas in summer they were positively correlated with organic matter availability. Denitrification rates were greater in the shallow, marginal sediments of the ICOLLs. Bioturbating macrofauna significantly enhanced in situ sediment oxygenation and probably transported sediment organic carbon and nitrate simultaneously to sites of denitrification at the sediment oxic–anoxic interface. Our study found that nitrate-saturated sediment denitrification rates were controlled by a hierarchy of temporally and spatially structured physico-chemical and biotic factors in the following order of importance: temperature → organic matter availability → water depth → bioturbation.
      PubDate: 2019-12-01
       
  • The status and potential distribution of Hydrocotyle umbellata L. and
           Salvinia auriculata Aubl. under climate change scenarios
    • Abstract: Aquatic ecosystems are susceptible to human-induced disturbance, including climate changes and biological invasions. The aim of this study was to assess the current and future potential distribution of two introduced aquatic species that have become invasive in some places where they were introduced. Hydrocotyle umbellata L. and Salvinia auriculata Aubl. are free-floating macrophytes native to North, Central, and South America. Both can quickly colonize aquatic environments because of their high growth rate and reproductive capacity similar to water hyacinth. Both species were introduced to Egypt for ornamental purposes. We have applied species distribution models using the Maxent approach and bioclimatic variables. Occurrence records from the entire range of the two species were obtained from the Global Biodiversity Information Facility and used for modelling their habitat suitability and assessing the potentiality of their spread in other new habitats. To project future changes in the two macrophytes’ distributions with respect to climate change, we used four representative concentration pathway scenarios (RCP 2.6, 4.5, 6.0 and 8.5) of the IPCC 5th assessment, based on different assumptions of greenhouse gas emissions for the future period of 2050s. The results showed that Maxent approach has successfully predicted the distribution of the two species with test AUC > 0.92. Bioclimatic variables that contributed the most to the prediction of the two species distribution included isothermality, temperature seasonality, mean temperature of the coldest quarter, and minimum temperature of the coldest month. Results showed that the range of S. auriculata is predicted to increase by 2050 under all climatic scenarios. A decline in the current climatically suitable habitats of H. umbellata is projected to occur in its native range, especially in South America, while it is predicted to gain more suitable habitats out of its native range in Europe and Africa. Both species are predicted to gain habitats outside their native range, while their ranges are expected to face a decline in their native region. The study can help in the identification of areas with high potential vulnerability to future invasions by the two studied aquatic macrophytes and thus can assist in prioritization of monitoring actions and management plans. This can reduce any ecological and socio-economic consequences due to invasion by these two aquatic plants.
      PubDate: 2019-12-01
       
  • Mesohabitat current velocity effects on Didymosphenia geminata and
           macroinvertebrates in a SE USA hypolimnetic tailwater
    • Abstract: The diatom Didymosphenia geminata is known to alter benthic habitat and macroinvertebrate diversity and community structure. Associations between macroinvertebrate communities and D. geminata biomass in riffle and run mesohabitats were investigated in the South Fork Holston River in Tennessee and Virginia, USA. We found that low current velocity, low turbidity, and high dissolved oxygen (DO) were strong predictors of D. geminata mat presence. Didymosphenia geminata ash-free dry mass was significantly higher in run mesohabitats with low current velocity (CV) than in riffle mesohabitats with higher CV. Macroinvertebrate alpha diversity (Shannon Diversity H’) was only marginally significantly different between riffle and runs, while beta diversity (community composition) was highly significantly different between these mesohabitats. NMDS analyses found that D. geminata was a relatively unimportant predictor of changes in community structure relative to specific conductance, CV, DO, and turbidity. However, effects of D. geminata on macroinvertebrates appear to be very taxon specific with effects on individual taxa potentially masked by tailwater effects on general macroinvertebrate diversity in global analyses. We observed that taxon-specific effects include, but are not limited to, (1) reduction of bryophyte microhabitat utilized by dominant ephemeropterans, trichopterans, amphipods, coleopterans, and some chironomid genera in run mesohabitats from competition with D. geminata for substrate attachment space; and (2) differences in utilization of D. geminata mat biomass as a food resource and microhabitat for chironomids. Our insights into taxon-specific effects of D. geminata on macroinvertebrates open up multiple avenues for experimentation in which to validate our observational findings.
      PubDate: 2019-12-01
       
  • Influence of abiotic factors on the composition and abundance of aquatic
           ferns occurring in the state of Paraíba, Brazil
    • Abstract: Aquatic ecosystems are influenced by water quality and the surrounding environment, and changes to such ecosystems exert an effect on species. The aim of the present study was to relate the composition/abundance of species of aquatic ferns to both abiotic factors of water quality (total phosphorus and chlorophyll a) and the characteristics of the surrounding environment (rural, urban and vegetation). We analyzed 53 aquatic ecosystems in the state of Paraíba with lentic characteristics, considering total phosphorus and chlorophyll a as well as the classification of land use and occupation in the surrounding areas. We recorded nine species of aquatic ferns, which demonstrated a preference for environments with good water quality (low concentration of chlorophyll a) as well as sensitivity to rural and urban activities. The individual analysis of the species revealed that abiotic factors exerted an influence on the occurrence and abundance of the species. Cyclosorus interruptus (Willd.) H. Ito proved to be resistant to impacted environments, whereas Marsilea sp. and Ceratopteris thalictroides (L.) Brongn proved to be bioindicators of water quality. Our study revealed species considered bioindicators of good water quality and identified changes in the composition/abundance of the species in relation to different land uses.
      PubDate: 2019-12-01
       
  • Allelopathic effects and potential active substances of Ceratophyllum
           demersum L. on Chlorella vulgaris Beij.
    • Abstract: Morphological responses of green algae to submerged macrophytes were rarely studied, and the potential active substances played roles in the interaction were little known previously. In the current work, according to acetone extract experiments, it was demonstrated that submerged macrophytes (Ceratophyllum demersum L.) could allelopathically inhibit the growth of Chlorella vulgaris Beij. and induce its colony formation, the effects of which were concentration dependent. Gas chromatography–mass spectrometry analysis revealed eight kinds of active substances from the C. demersum extracts, namely hexanoic acid, phthalic acid, octanedioic acid, butenoic acid, azelaic acid, palmitic acid, alpha linolenic acid and pentanedioic acid. Standard compound addition test indicated that palmitic acid and alpha linolenic acid might play important roles in the induction of colony formation and growth inhibition of C. vulgaris. This study provided some more new insights into the photosynthetic organism interaction between submerged macrophytes and green algae, in terms of not only growth but also morphological responses.
      PubDate: 2019-12-01
       
  • Viability of pico- and nanophytoplankton in the Baltic Sea during spring
    • Abstract: Phytoplankton cell death is an important process in marine food webs, but the viability of natural phytoplankton communities remains unexplored in many ecosystems. In this study, we measured the viability of natural pico- and nanophytoplankton communities in the central and southern parts of the Baltic Sea (55°21′ N, 17°06′ E–60°18′ N, 19°14′ E) during spring (4th–15th April 2016) to assess differences among phytoplankton groups and the potential relationship between cell death and temperature, and inorganic nutrient availability. Cell viability was determined by SYTOX Green cell staining and flow cytometry at a total of 27 stations representing differing hydrographic regimes. Three general groups of phytoplankton (picocyanobacteria, picoeukaryotes, and nanophytoplankton) were identified by cytometry using pigment fluorescence and light scatter characteristics. The picocyanobacteria and picoeukaryotes had significantly higher cell viability than the nanophytoplankton population at all depths throughout the study area. Viability correlated positively with the photosynthetic efficiency (Fv/Fm, maximum quantum yield of photosystem II) as measured on the total phytoplankton community. However, an anticipated correlation with dissolved organic carbon was not observed. We found that the abiotic factors suggested to affect phytoplankton viability in other marine ecosystems were not as important in the Baltic Sea, and other biotic processes, e.g. processes related to species succession could have a more pronounced role.
      PubDate: 2019-11-11
       
  • An empirical test of the impact of drying events and physical disturbance
           on wind erosion of zooplankton egg banks in temporary ponds
    • Abstract: Most temporary pond zooplankton species produce drought-resistant eggs that accumulate in the sediment and form an egg bank. When a pond dries and the egg bank is exposed, wind erodes eggs and wind action has been suggested as an important determinant of population demographics. While field observations suggest that egg bank erosion may be highest shortly after pond drying and physical disturbance of the sediment crust, this remains to be tested empirically. We performed a laboratory wind tunnel experiment to assess the effects of wind speed and sediment characteristics on egg pickup rates over time in a controlled environment. We used sediment samples in which an egg bank of the fairy shrimp Branchipodopsis wolfi was embedded and compared the number of eggs that blew away from dry, drying and disturbed egg banks as a function of time. Few eggs were picked up when the egg bank was dry prior to exposure, even at winds of 70 km h−1. Most eggs were eroded when the egg bank was exposed to wind before it dried out, after the last water evaporated. Likewise, physical disturbance resulted in strong erosion fluxes. Overall, our results suggest that the state of the egg bank may be more important for egg bank erosion rates than the prevailing wind speed or the wind exposure time. Also, our findings are worrying in the context of climate change since they imply that predicted increases in drying events and reduced inundation lengths may compromise egg bank persistence in temporary ponds.
      PubDate: 2019-11-05
       
  • Temporal–spatial variations and source identification of dissolved
           nitrate in the upper Han River basin, China
    • Abstract: Human activities have greatly increased the nitrogen (N) loading in rivers over the past century, and consequently, N pollution has become a severe problem in aquatic systems. Nitrate (NO3−) is the predominant form of dissolved N in aquatic environments. In the present study, we evaluated N pollution characteristics and identified N sources using an isotope tracing technique in the upper Han River, a tributary of the Yangtze River with a length of 925 km in China. The objectives of this study were to evaluate the variations of N concentrations and explore the N sources in different time periods and areas. The results revealed that NO3− had significantly higher concentrations in July (22.75 ± 17.75 mg L−1) than that in other sampling months (14.00 ± 10.85 mg L−1 in November, 13.70 ± 11.55 mg L−1 in January, 4.99 ± 6.10 mg L−1 in April), and it also presented significant spatial variations (p < 0.05) along the riverine network. Isotope analysis indicated a rather large range of isotope values, implying that the NO3− in the upper Han River originated from different sources, primarily from sewage. There was a large overlap of δ15NO3− values between different sources during the growing season (April/July), demonstrating the various inputs of N sources. Our results revealed the degraded water quality and poor control of N run off into the river. With the assessment of temporal–spatial variation and sources of N, improved management practices can be implemented to protect water resource and avoid further water quality deterioration in the upper Han River.
      PubDate: 2019-11-04
       
  • Strategies of phosphorus utilization in an astaxanthin-producing green
           alga Haematococcus pluvialis , a comparison with a bloom-forming
           cyanobacterium Microcystis wesenbergii
    • Abstract: Haematococcus pluvialis is a unicellular green alga with great commercial value, due to its synthesis of powerful antioxidant astaxanthin. H. pluvialis was mainly distributed in small water bodies but was also observed in eutrophicated lakes, and even coexisted with Microcystis. However, Haematococcus cells never prevail in eutrophicated water bodies. Phosphorus is the main limiting factor in most aquatic ecosystems and may have a role in the distribution of H. pluvialis. Here, we focused on the physiological responses of H. pluvialis to various phosphorus conditions (0.002, 0.02, 0.2, and 2 mM), and compared with a bloom-forming cyanobacterium Microcystis wesenbergii. Growth determination suggested that high phosphorus conditions (0.2 mM and 2 mM) favor the growth of H. pluvialis cells, but H. pluvialis cells have a shorter duration of log phase than M. wesenbergii cells. Growth determination also indicated H. pluvialis cells had lower tolerability to low phosphorus (0.002 mM). Qualitative comparisons from long-term and short-term phosphorus uptake experiments, polyphosphate accumulation and extracellular alkaline phosphatase expression analysis suggested two different phosphorus utilization strategies in the two species. H. pluvialis cells were characterized with the induction of extracellular alkaline phosphatase to survive phosphorus-deficient condition, while M. wesenbergii cells were characterized with quick uptake of phosphorus and accumulation more of polyphosphate in phosphorus-replete conditions. To our knowledge, this is the first study to demonstrate features of phosphorus uptake and utilization in H. pluvialis, which will increase our understanding in the distribution of H. pluvialis.
      PubDate: 2019-09-05
       
  • Growth and age of the midget octopus, Octopus huttoni
    • Abstract: The midget octopus Octopus huttoni is an important link between trophic levels as a food source and a predator, but little is known about its life history or growth. This is the first study to age and quantify growth in O. huttoni from three populations in Southern New Zealand, namely Foveaux Strait, Otago Harbour, and the Otago continental shelf. Morphometries were measured for 121 individuals, ages were estimated for 109 individuals using beak and stylet increment analysis, and lipofuscin quantity was analysed for 106 individuals. Assuming that one increment equals 1 day, beaks provided the highest age estimate (up to 250 days), but are suspected to be an underestimate (40–70 days) because increments were not found on laboratory-reared paralarval beaks, suggesting that the first increment may form after settlement. Daily growth rings in stylets were validated by tetracycline marking, but low estimates of age were attributed to poor visualisation of the stylet nucleus. The relationships between lipofuscin volume ratio and age or size of the individual were not significant, lipofuscin density was low, and individual variation was high. Results indicated that this species displays indeterminate growth until death, with a maximum mantle length of 50–60 mm at an age of 200–250 days. Further, individuals from Foveaux Strait were smaller and younger than those found in the Otago Harbour, supporting an hypothesis of an ontogenetic migration onshore.
      PubDate: 2019-09-05
       
  • Molecular characterization and phylogenetics of Indian polychaete fauna:
           scope for implementation in ecological monitoring
    • Abstract: DNA barcodes are increasingly applied to ascertain the taxonomic identification to improve the speed and accuracy of ecological monitoring programmes. The success of integrating molecular approach in routine surveys ultimately depends on the coverage of reference libraries that require constant upgradation. The present molecular study was aimed at strengthening the genetic database of Polychaeta, which at present is poorly constructed. The current effort is first of its kind that covered a large geographical area along the northwest India. The study has contributed in building a comprehensive COI database of polychaete taxocene that included new records of one family, four genera and six species. The phylogenetic analysis revealed presence of 19 distinct clades, each comprising of individual family with studied polychaete species and conspecific/congeneric reference sequences. This is the first analysis that revealed a close relationship between Longosomatidae and Cirratulidae, rather than Spioniform polychaetes. Thus, the phylogenetic information was useful in distinguishing the polychaete species in the study region. Molecular analysis also facilitated the identification of potentially new Streblospio sp. that displayed close morphological as well as genetic affinity with S. gynobranchiata, with an inter-specific distance of 0.11. The present study proves the effectiveness of molecular characterization and phylogenetics in delineating the Indian polychaete species complex for ecological monitoring. The reference database can aid the high-throughput biomonitoring programmes in future.
      PubDate: 2019-09-04
       
 
 
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