Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

EARTH SCIENCES (527 journals)                  1 2 3 | Last

Showing 1 - 200 of 371 Journals sorted alphabetically
ACS Earth and Space Chemistry     Free   (Followers: 6)
Acta Brasiliensis     Open Access  
Acta Geochimica     Hybrid Journal   (Followers: 6)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 2)
Acta Geológica Lilloana     Open Access  
Acta Geophysica     Hybrid Journal   (Followers: 9)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 4)
Advances in High Energy Physics     Open Access   (Followers: 23)
Advances in Limnology     Full-text available via subscription   (Followers: 2)
Advances In Physics     Hybrid Journal   (Followers: 29)
Aeolian Research     Hybrid Journal   (Followers: 7)
African Journal of Aquatic Science     Hybrid Journal   (Followers: 17)
AGU Advances     Open Access  
Algological Studies     Full-text available via subscription   (Followers: 1)
All Earth     Open Access   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 4)
AMBIO     Hybrid Journal   (Followers: 11)
Anales del Instituto de la Patagonia     Open Access  
Andean geology     Open Access   (Followers: 10)
Annales Henri Poincaré     Hybrid Journal   (Followers: 2)
Annals of Geophysics     Open Access   (Followers: 12)
Annals of GIS     Open Access   (Followers: 30)
Annual Review of Marine Science     Full-text available via subscription   (Followers: 12)
Anthropocene     Hybrid Journal   (Followers: 6)
Anthropocene Review     Hybrid Journal   (Followers: 9)
Anuário do Instituto de Geociências     Open Access  
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computing and Geosciences     Open Access   (Followers: 3)
Applied Geochemistry     Hybrid Journal   (Followers: 14)
Applied Geomatics     Hybrid Journal   (Followers: 4)
Applied Geophysics     Hybrid Journal   (Followers: 11)
Applied Ocean Research     Hybrid Journal   (Followers: 6)
Applied Petrochemical Research     Open Access   (Followers: 2)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (Followers: 44)
Arctic Science     Open Access   (Followers: 7)
Arctic, Antarctic, and Alpine Research     Open Access   (Followers: 12)
arktos : The Journal of Arctic Geosciences     Hybrid Journal  
Artificial Intelligence in Geosciences     Open Access   (Followers: 6)
Artificial Satellites     Open Access   (Followers: 21)
Asia-Pacific Journal of Atmospheric Sciences     Hybrid Journal   (Followers: 21)
Asian Journal of Earth Sciences     Open Access   (Followers: 16)
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Asian Review of Environmental and Earth Sciences     Open Access   (Followers: 1)
Atlantic Geology : Journal of the Atlantic Geoscience Society / Atlantic Geology : revue de la Société Géoscientifique de l'Atlantique     Open Access   (Followers: 10)
Atmosphere-Ocean     Full-text available via subscription   (Followers: 16)
Atmospheric and Climate Sciences     Open Access   (Followers: 30)
Australian Journal of Earth Sciences: An International Geoscience Journal of the Geological Society of Australia     Hybrid Journal   (Followers: 10)
Austrian Journal of Earth Sciences     Open Access   (Followers: 1)
AWWA Water Science     Hybrid Journal   (Followers: 1)
Bonorowo Wetlands     Open Access  
Boreas: An International Journal of Quaternary Research     Hybrid Journal   (Followers: 13)
Brill Research Perspectives in Map History     Full-text available via subscription   (Followers: 1)
Bulletin of Earthquake Engineering     Hybrid Journal   (Followers: 10)
Bulletin of Geosciences     Open Access   (Followers: 11)
Bulletin of the Lebedev Physics Institute     Hybrid Journal  
Bulletin of the Seismological Society of America     Full-text available via subscription   (Followers: 26)
Bulletin of Volcanology     Hybrid Journal   (Followers: 22)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 18)
Carbonates and Evaporites     Hybrid Journal   (Followers: 1)
CATENA     Hybrid Journal   (Followers: 11)
Chemical Geology     Hybrid Journal   (Followers: 31)
Chinese Geographical Science     Hybrid Journal   (Followers: 6)
Ciencia del suelo     Open Access   (Followers: 1)
Ciencias Espaciales     Open Access  
Climate and Development     Hybrid Journal   (Followers: 32)
Coastal Management     Hybrid Journal   (Followers: 29)
Cogent Geoscience     Open Access  
Communications Earth & Environment     Open Access   (Followers: 2)
Comptes Rendus : Geoscience     Open Access   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 12)
Continental Shelf Research     Hybrid Journal   (Followers: 12)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 11)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
Coral Reefs     Hybrid Journal   (Followers: 22)
Cretaceous Research     Hybrid Journal   (Followers: 10)
Depositional Record     Open Access  
Développement durable et territoires     Open Access   (Followers: 2)
Diatom Research     Hybrid Journal   (Followers: 3)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamics of Atmospheres and Oceans     Hybrid Journal   (Followers: 19)
E&S Engineering and Science     Open Access  
E3S Web of Conferences     Open Access  
Earth and Planetary Physics     Open Access   (Followers: 2)
Earth and Planetary Science Letters     Hybrid Journal   (Followers: 142)
Earth and Space Science     Open Access   (Followers: 26)
Earth Interactions     Open Access   (Followers: 10)
Earth Science Malaysia     Open Access  
Earth Science Research     Open Access   (Followers: 9)
Earth Sciences Pakistan     Open Access  
Earth Sciences Research Journal     Open Access  
Earth Surface Dynamics (ESurf)     Open Access   (Followers: 10)
Earth Surface Dynamics Discussions (ESurfD)     Open Access   (Followers: 1)
Earth Surface Processes and Landforms     Hybrid Journal   (Followers: 25)
Earth System Dynamics     Open Access   (Followers: 6)
Earth System Dynamics Discussions     Open Access   (Followers: 3)
Earth Systems and Environment     Hybrid Journal   (Followers: 3)
Earth's Future     Open Access   (Followers: 6)
Earth, Planets and Space     Open Access   (Followers: 77)
Earthquake Engineering and Engineering Vibration     Hybrid Journal   (Followers: 8)
Earthquake Research Advances     Open Access   (Followers: 1)
Earthquake Spectra     Hybrid Journal   (Followers: 20)
Ecohydrology     Hybrid Journal   (Followers: 9)
Ecological Questions     Open Access   (Followers: 5)
Electromagnetics     Hybrid Journal   (Followers: 13)
Energy Efficiency     Hybrid Journal   (Followers: 9)
Energy Exploration & Exploitation     Open Access   (Followers: 4)
Energy Geoscience     Open Access  
Environmental Earth Sciences     Hybrid Journal   (Followers: 29)
Environmental Geology     Hybrid Journal   (Followers: 25)
Environmental Geosciences     Full-text available via subscription   (Followers: 6)
Environmental Geotechnics     Hybrid Journal   (Followers: 6)
Environmental Processes : An International Journal     Hybrid Journal  
Erwerbs-Obstbau     Hybrid Journal  
Estuaries and Coasts     Hybrid Journal   (Followers: 22)
Estuarine, Coastal and Shelf Science     Hybrid Journal   (Followers: 41)
Estudios Geográficos     Open Access   (Followers: 1)
European Journal of Mineralogy     Hybrid Journal   (Followers: 12)
European Journal of Remote Sensing     Open Access   (Followers: 18)
Exploration Geophysics     Hybrid Journal   (Followers: 4)
Facies     Hybrid Journal   (Followers: 9)
FIGEMPA : Investigación y Desarrollo     Open Access   (Followers: 1)
Física de la Tierra     Open Access  
Folia Musei rerum naturalium Bohemiae occidentalis. Geologica et Paleobiologica     Open Access  
Forestry Chronicle     Full-text available via subscription   (Followers: 9)
Frontiers in Earth Science     Open Access   (Followers: 8)
Frontiers in Soil Science     Open Access  
Frontiers of Earth Science     Hybrid Journal   (Followers: 12)
Fundamental and Applied Limnology / Archiv für Hydrobiologie     Full-text available via subscription   (Followers: 3)
GEM - International Journal on Geomathematics     Hybrid Journal   (Followers: 1)
Geo-Marine Letters     Hybrid Journal   (Followers: 6)
Geoacta     Open Access   (Followers: 2)
GeoArabia     Hybrid Journal  
Geobiology     Hybrid Journal   (Followers: 8)
Geocarto International     Hybrid Journal   (Followers: 23)
Geochemical Perspectives     Hybrid Journal   (Followers: 2)
Geochemistry     Hybrid Journal   (Followers: 5)
Geochemistry : Exploration, Environment, Analysis     Hybrid Journal   (Followers: 6)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 35)
Geochimica et Cosmochimica Acta     Hybrid Journal   (Followers: 54)
Geochronology (GChron)     Open Access  
Geochronometria     Open Access   (Followers: 1)
Geoderma Regional : The International Journal for Regional Soil Research     Full-text available via subscription   (Followers: 4)
Geodynamics & Tectonophysics     Open Access   (Followers: 3)
Geoenvironmental Disasters     Open Access   (Followers: 3)
Geofluids     Open Access   (Followers: 5)
Geoforum     Hybrid Journal   (Followers: 25)
Geography and Natural Resources     Hybrid Journal   (Followers: 8)
GeoHazards     Open Access   (Followers: 2)
GeoHealth     Open Access  
Geoheritage     Hybrid Journal   (Followers: 1)
Geoinformatics & Geostatistics     Hybrid Journal   (Followers: 14)
Geologia USP : Série Científica     Open Access   (Followers: 1)
Geological Journal     Hybrid Journal   (Followers: 19)
Geological Magazine     Hybrid Journal   (Followers: 16)
Geology Today     Hybrid Journal   (Followers: 31)
Geology, Geophysics and Environment     Open Access   (Followers: 2)
Geomagnetism and Aeronomy     Hybrid Journal   (Followers: 3)
Geomatics, Natural Hazards and Risk     Open Access   (Followers: 13)
Geomechanics and Geophysics for Geo-Energy and Geo-Resources     Hybrid Journal  
Geomechanics for Energy and the Environment     Full-text available via subscription  
GEOmedia     Open Access   (Followers: 1)
Geomorphology     Hybrid Journal   (Followers: 33)
Geophysical & Astrophysical Fluid Dynamics     Hybrid Journal   (Followers: 8)
Geophysical Journal International     Hybrid Journal   (Followers: 40)
Geophysical Prospecting     Hybrid Journal   (Followers: 7)
Geophysics     Full-text available via subscription   (Followers: 19)
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards     Hybrid Journal   (Followers: 8)
Geoscience Canada : Journal of the Geological Association of Canada / Geoscience Canada : journal de l'Association Géologique du Canada     Full-text available via subscription   (Followers: 6)
Geoscience Communication     Open Access  
Geoscience Data Journal     Open Access   (Followers: 5)
Geoscience Frontiers     Open Access   (Followers: 10)
Geoscience Letters     Open Access  
Geosciences     Open Access   (Followers: 3)
Geosciences Journal     Hybrid Journal   (Followers: 10)
Geoscientific Instrumentation, Methods and Data Systems     Open Access   (Followers: 2)
Geoscientific Instrumentation, Methods and Data Systems Discussions     Open Access   (Followers: 1)
Geoscientific Model Development     Open Access   (Followers: 8)
Geoscientific Model Development Discussions     Open Access  
Geostandards and Geoanalytical Research     Hybrid Journal   (Followers: 3)
Geosystem Engineering     Hybrid Journal  
Geosystems and Geoenvironment     Open Access  
Geotectonic Research     Full-text available via subscription   (Followers: 5)
Geotectonics     Hybrid Journal   (Followers: 9)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 1)
Global and Planetary Change     Hybrid Journal   (Followers: 18)
Global Biogeochemical Cycles     Full-text available via subscription   (Followers: 17)
Gondwana Research     Hybrid Journal   (Followers: 10)
GPS Solutions     Hybrid Journal   (Followers: 28)
Grassland Science     Hybrid Journal  
Ground Water Monitoring & Remediation     Hybrid Journal   (Followers: 25)
Groundwater     Hybrid Journal   (Followers: 37)
Groundwater for Sustainable Development     Full-text available via subscription   (Followers: 5)
Helgoland Marine Research     Open Access   (Followers: 2)
History of Geo- and Space Sciences     Open Access   (Followers: 1)
Hydrobiologia     Hybrid Journal   (Followers: 21)
Hydrogeology Journal     Hybrid Journal   (Followers: 21)

        1 2 3 | Last

Similar Journals
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Hydrobiologia
Journal Prestige (SJR): 0.896
Citation Impact (citeScore): 2
Number of Followers: 21  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-5117 - ISSN (Online) 0018-8158
Published by Springer-Verlag Homepage  [2469 journals]
  • Molecular testing of the São Francisco River as an ecological filter for
           the Brazilian large-eyed stingray Hypanus marianae (Dasyatidae,
           Myliobatiformes)

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      Abstract: Abstract Ecological niche modeling (ENM) provides information on the potential environmental barriers to a species that can be tested in phylogeographic studies. A previous ENM analysis of the benthic coastal stingray Hypanus marianae revealed a low suitability area for its occurrence at the São Francisco River (SFR) mouth, the fourth largest river flowing into Southwestern Atlantic. Hence, phylogeographic analyses were used to test the hypothesis of two populations: one north and another south of SFR outflow. We sampled 109 specimens in six localities throughout the species’ geographic distribution and sequenced mitochondrial (cytb) and nuclear (rag1) markers. Our analyses corroborated the existence of two groups (ΦST = 0.68, P < 0.0001) within H. marianae, partially agreeing with the ENM results. The commonest mitochondrial haplotype (H2) was shared among almost all localities, except Salvador, where all individuals shared the same and unique haplotype. This group is restricted to a shallow bay area close to SFR, as predicted by the ENM. However, its plume was not effective in isolating a continental island 55 km off the Brazilian coast. While the broad north group is protected in a few Marine Protected Areas, our results suggest that the restricted southern one deserves to be managed specifically.
      PubDate: 2022-06-01
       
  • Spatially varying trophic effects of reservoir-derived plankton on stream
           macroinvertebrates among heterogeneous habitats within reaches

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      Abstract: Abstract Using a stable isotope two- and three-source mixing model, we evaluated trophic contributions of reservoir-derived plankton, epilithon, and terrestrial leaves to stream macroinvertebrates at two dam upstream and four dam outlet reaches. We compared four different habitat types co-occurring within the reaches: lotic habitat, bar-head lentic habitat, bar-tail lentic habitat, and isolated pond on sandy bars. Filter-feeders, which provide the highest trophic contributions of reservoir-derived plankton, did not significantly differ among habitats, whereas collector-gatherers and predators differed significantly. Thus, the three-source model analysis for collector-gatherers and predators indicated a lower proportion of reservoir-derived plankton in lentic habitat than in lotic habitat. This difference in food source composition was reflected in the lower trophic contribution of plankton to lentic species. Macroinvertebrates in lentic habitats fed on sources less mixed with reservoir-derived plankton; therefore, the trophic impact of reservoirs was indistinctive at the community level, indicating that lentic habitats can function as trophic refugia to mitigate the trophic impact of reservoirs. Our findings demonstrate that habitat heterogeneity potentially provides a foundation for determining the trophic contribution of food webs while affecting communities when there is anthropogenic input of food resources to the habitat.
      PubDate: 2022-06-01
       
  • Early development of the threatened coral Acropora cervicornis

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      Abstract: Abstract Acropora cervicornis underwent massive mortalities in the Caribbean Sea and its populations have failed to recover after several decades. This study aimed to document the early life history of A. cervicornis from embryogenesis to symbiotic dinoflagellates acquisition. Gametes were collected in Islas del Rosario (Colombia) and a cross-fertilization was performed ex situ. A settlement experiment was performed including two treatments: smooth surfaces and rugose surfaces. Embryogenesis lasted for 63 h and larvae began to settle 8 days after fertilization. There were no significant differences in settlement between rugose (32% ± 16.59) and smooth (21% ± 11.45) surfaces. Survival on rugose surfaces was significantly lower (29% ± 11.71) compared to smooth surfaces (47% ± 35.02), due to the negative effect of sediment accumulation and turf algae. Seventeen days after fertilization 54% ± 4.13 of polyps acquired symbiotic dinoflagellates. This study contributes to the knowledge of early development of A. cervicornis in laboratory conditions, which complements restoration methods based on asexual reproduction.
      PubDate: 2022-06-01
       
  • Influence of anthropogenic pressure on the genetic diversity and
           chromosomal instability of an endangered forest-specialist anuran

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      Abstract: Abstract Deforestation leads to changes in the landscape, which can isolate and decrease the size of populations affecting their structure and genetic variability. Additionally, it can increase the frequency of chromosomal damage due to exposure to genotoxic agents present in the environment. Among vertebrates, amphibians are the most threatened taxonomic group, especially forest-specialist species. Our work aimed to assess the impact of deforestation on landscape, as well as in the genetic diversity and genomic instability of populations of the amphibian species Crossodactylus schmidti Gallardo, 1961, which is restricted to well-preserved stream environments in the Atlantic rainforest in southern Brazil. Sampling of oral mucosa cells was carried out in four different forest areas. We analyzed a total of 200 sequences of two mitochondrial (COI and 16S) and one nuclear gene (Tyrosinase), as well as 1000 oral mucosa cells per individual through cytogenetic analyses. Our results clearly indicate that all forest areas analyzed in this work are important for the genetic diversity and maintenance of these populations in the landscape, regardless of size. However, the largest area has the major role as disperser of genetic diversity, highlighting the importance of conservation units and large forest areas for the persistence of endangered forest-specialist amphibian species.
      PubDate: 2022-06-01
       
  • Secondary contact, hybridization, and diversification in Arctic charr
           (Salvelinus alpinus (L.) species complex) from lakes of the
           Norilo-Pyasinskaya water system, Taimyr: how many forms exist there'

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      Abstract: Abstract Arctic charr Salvelinus alpinus (L.) complex has two or more sympatric forms in many lakes representing a subject for discussions on the mechanisms of their origin and taxonomic status. To determine the number of sympatric forms in three large lakes of the Norilo-Pyasinskaya water system (Taimyr) and their reproductive and phylogenetic relationships, 17 microsatellite loci, sequences of the mtDNA control region, and several morphological characteristics were analyzed. Our data indicate that eight reproductively isolated forms inhabit lakes Lama and Kapchuk, and at least three forms are distributed in Lake Sobach’e. The origin of the forms is associated with the secondary contact and hybridization of the European and Siberian phylogenetic lineages. The same names of the forms from different lakes of Taimyr and Chukotka, for example, Boganida charr and Dryagin’s charr, may reflect their certain morphological similarity, but rarely close relationships. Our data indirectly indicate that introgressive hybridization and biogeographical changes of the lakes within the region in the last glacial and post-glacial periods played a significant role in the formation of a high Arctic charr biodiversity. The problem associated with systematics, taxonomy, and conservation of the forms in Taimyr lakes is complex and should be solved gradually.
      PubDate: 2022-06-01
       
  • Geometric morphometrics shows a close relationship between the shape
           features, position on thalli, and CaCO3 content of segments in Halimeda
           tuna (Bryopsidales, Ulvophyceae)

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      Abstract: Abstract Calcifying green algae of the genus Halimeda J.V. Lamouroux are typical for the modular thalli composed of serial segments. Their CaCO3 content gradually increases with age due to calcification, the intensity of which is largely linked to photosynthesis. The dynamics of segment phenotypic plasticity at different scales and its relation to CaCO3 content is not well known. We investigated the populations of Halimeda tuna in the upper sublittoral of four regions on the Adriatic Sea coast. Using geometric morphometrics, we explored the patterns of segment shape plasticity, their relationships with the spatial factors and CaCO3 content. The results showed that segment position on thalli was the main determinant of their shape features. This effect was considerably more prominent than the differences among plants, populations, or regions. Likewise, the segment shape proved to be a significant predictor of their CaCO3 content. Segments with inversely conical shapes, typical for the lower parts of branches, contained significantly less CaCO3 than the reniform and oval segments that probably contribute most to the overall carbonate budget of the Mediterranean Halimeda draperies.
      PubDate: 2022-06-01
       
  • Efficiency of aquatic PIT-tag telemetry, a powerful tool to improve
           monitoring and detection of marked individuals in pond environments

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      Abstract: Abstract Identifying and tracking individuals across time are a prerequisite to uncover key traits of their ecology and behavior. However, obtaining fine-grain individual data at multiple locations, especially in aquatic environments, is challenging due to trade-offs between time constraints and detection probabilities. Aquatic telemetry of passive integrated transponder (PIT)-tagged organisms has been proposed to cope with detectability issues, but its efficiency has not been tested in stagnant waters. This technology was evaluated in ponds by monitoring marsh frogs (Pelophylax ridibundus). Multivariate survival models were fitted to quantify the success of detection rates over detection times and across ponds characterized by different habitat features. An average detection rate of 81% was obtained in less than 18 min on average, whereas a maximum detection rate was achieved in almost a quarter of the surveys. The detection rates were lower in the deeper and larger ponds but increasing detection times improved detection probabilities. Altogether, these results show that PIT-tag telemetry is a powerful tool to survey aquatic organisms, such as pond-breeding amphibians. The generalization of the use of this monitoring technique in ponds can therefore encompass fine-grain analyses over numerous sites and fill the gap between studies at local and landscape scales.
      PubDate: 2022-06-01
       
  • The influence of light and nutrient availability on floating plant
           dominance in forested temporary and semipermanent wetlands

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      Abstract: Abstract Nutrient availability is well documented to control floating plant dominance, but the role of secondary drivers in mediating this relationship is less understood. Light may act as an important secondary driver in aquatic plant communities, particularly with tree canopies in forested wetlands. I explored the dual roles of light and nutrients (nitrogen and phosphorus) in affecting abundances of free-floating duckweeds (Lemnoideae and Wolffioideae) in isolated wetlands. I surveyed producers and abiotic conditions in 35 temporary and semipermanent wetlands with differing forest canopy openness in southwest Michigan, USA. Also, I manipulated nutrient supply, light levels, and initial densities of floating plants factorially in outdoor mesocosms. In the survey, duckweeds could dominate wetlands at nearly the entire range of light conditions, and in lower light and higher nitrogen duckweeds dominated frequently. However, emergent and submerged plants only dominated wetlands at high light levels, and duckweed abundances had no clear relationship with nitrogen levels under those conditions. In the experiment, I found a light × nutrient interaction in the initial response of duckweeds, although this pattern dissipated later in the experiment as variability increased. These data suggest that light availability may be an important secondary driver to determine floating plant dominance in forested wetlands.
      PubDate: 2022-06-01
       
  • Landscape associations with native and invasive freshwater mussels

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      Abstract: Abstract Landscape impacts on aquatic organisms can play important roles in community structure and distributions, and landscape alteration can present unique challenges for organisms like freshwater mussels (Bivalvia: Unionidae) that can be compounded by the presence of invasive species. This study examined the impacts of landscape variables on native freshwater mussel and invasive Corbicula spp. distributions and densities in the Kalamazoo River watershed, MI, USA. Landscape impacts were analyzed at three spatial scales using GIS and regression tree analyses to determine factors influencing unionid and corbiculid densities. Results indicated that land use, geology, and longitudinal position in the watershed influence densities of unionids and corbiculids. In addition, corbiculid density was found to be important in determining unionid density and distribution at the reach scale. Results showed that landscape variables can influence invasive and native mussel species and emphasize the need to incorporate spatial information into our understanding of the relationships among organisms and their environments. The knowledge gained here contributes to evidence of the impacts that landscape can have on the abundance and distribution of both native and invasive organisms and provides insight into the associations of invasive Corbicula spp. with landscape variables and native unionids at multiple spatial scales.
      PubDate: 2022-06-01
       
  • Assessing methods for mitigating fungal contamination in freshwater mussel
           in vitro propagation

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      Abstract: Abstract Many freshwater mussel species are critically imperiled, and propagation is essential for species ‘recovery.’ Fungal contamination can negatively affect in vitro propagation of freshwater mussels; thus, we investigated methods of mitigating fungal contamination. Specifically, we tested the effect of medium replacement frequency and antifungal (Amphotericin B) concentrations on risk of fungal contamination and transformation success of two species, Alasmidonta heterodon and congener, Alasmidonta undulata. We observed a trend of increased contamination risk in treatment groups that received medium replacements every 1 or 2 days (vs. every 3 days), but this trend was not statistically significant. We found that contamination risk differed significantly across Amphotericin B concentrations. Although contamination severity reduced transformation success, we found no significant difference in transformation success based on medium replacement frequency. Amphotericin B concentration was negatively correlated with transformation success, suggesting toxicity at higher concentrations. Additionally, we identified the fungal pathogen (Candida parapsilosis), the first knowledge of this fungus during mussel culture. Our findings suggest that low contamination results in high probability for transformation success; however, there is a tradeoff in higher concentrations of Amphotericin B. This study offers new ideas for improving mussel propagation techniques that may better control fungal contamination and increase transformation success.
      PubDate: 2022-06-01
       
  • Ecological niche models reveal the potential zones of invasion of the
           cobia (Rachycentron canadum) in the Eastern Pacific Ocean

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      Abstract: Cobias (Rachycentron canadum) are large fish that live in all the tropical oceans of the world, except for the Eastern Pacific Ocean (EPO). During 2015, a cobia cage culture was initiated in the EPO off Ecuador. Thousands of cobia individuals escaped from the culture, and the location of the escapees is unknown. In this paper, we used a Maximum Entropy (MaxEnt) model to assess the preferential habitat of cobia in a portion of its natural occurrence range and used the model to predict the potential invasion zones of cobia in the EPO. The model performance was satisfactory (75–93% accuracy). Mixed Layer Depth (MLD) was the most important environmental variable. Cobia inhabits waters near the continental shelf, with a shallow MLD. Five important zones of high probability of invasion were detected in the EPO: one in the southern California Current, one in the Central Mexican Pacific, one off Guatemala/El Salvador, one in a latitudinal band that detaches from the coastline of Central America, and one off Northern Chile. There is an important seasonal variation of the zones of high probability of cobia invasion, variation that is apparently related to the seasonal cycle of different large-scale and mesoscale systems.
      PubDate: 2022-06-01
       
  • Size matters: variations in seagrass seed size at local scales affects
           seed performance

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      Abstract: Seed size can have an impact on angiosperm reproductive fitness. Ecological theory predicts plants that will produce larger seeds in stressful environments to increase the chances of seedling survival and numerous small seeds in favourable conditions to increase the number of recruits. We measured seed morphology of the seagrass Heterozostera nigricaulis from four populations under differing environmental conditions in South East Australia. Seed size and mass among sites showed consistent differences over four flowering seasons. Seeds from exposed, ephemeral meadows (Blairgowrie, Edwards Point) were 19%–53% heavier than those from larger, stable meadows at more sheltered sites (Swan Bay, Point Henry). Overall, heavier seeds from exposed sites performed better in germination experiments and persisted (remained viable) longer compared to small seeds from sheltered sites. Seeds from sheltered sites showed contrasting levels of seed performance. Small seeds from Swan Bay had the lowest germination but the proportion of viable seeds after 12 months were much higher (41%) than similar sized seeds from Point Henry (0%). There are clear life history benefits of large seeds that facilitate seed persistence and germination at exposed sites; however, the performance of smaller seeds varied between sites and may be a function of other site-specific advantages.
      PubDate: 2022-06-01
       
  • Identifying high-risk areas for introduction of new alien species: the
           case of the invasive round goby, a door-knocker for Norway

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      Abstract: Identifying new areas of colonisation by alien species is important for early detection and management. Door-knocker species pose problems for traditional predictive models because of lacking presence–absence data, but habitat suitability modelling might overcome this. We here identify the most likely areas for introduction and first establishment of the invasive round goby Neogobius melanostomus to Norway, where it has not yet been registered. We implemented knowledge on dispersal pathways and the species’ biology in a simplified suitability model based on spatial data representing the most relevant environmental variables: distance to international harbours in Norway, distance to the closest population in neighbouring country, salinity, wave exposure, depth and water temperature. The results suggest that there are many potential localities for introduction and first establishment and reveal several hotspots of such areas, especially in less-exposed coastal brackish areas of southern Norway. Especially the region around the Oslo Fjord stands out as being associated with higher risk. Our results could guide future monitoring programmes and increase the chance of early detection of this potential new invader. The study illustrates how spatial analyses can be used to identify the most likely areas for future invasion by an aquatic door-knocker species despite lacking presence–absence data.
      PubDate: 2022-06-01
       
  • Dietary contributions of the alien zebra mussel Dreissena polymorpha in
           British freshwater fish suggest low biological resistance to their
           invasion

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      Abstract: Native communities can resist the establishment and invasion of alien species through consumptive and/or competitive interactions. The extent of consumptive resistance from freshwater fish to the invasion of zebra mussels Dreissena polymorpha, a globally invasive Ponto-Caspian species, was assessed in two areas in Britain using stable isotope analysis, where mixing models predicted the contribution of putative prey resources (including zebra mussel) to fish diet. Across the sites and species, only roach Rutilus rutilus were predicted to have a diet where zebra mussels contributed highly (predicted contribution: 44%), with literature suggesting that their functional morphology would have facilitated their consumption of this prey item. Predicted contributions of zebra mussels to common bream Abramis brama diet was comparatively low (29%), despite them being present to much larger sizes than roach, and with pike Esox lucius, perch Perca fluviatilis and pikeperch Sander lucioperca also predicted to have low dietary contributions of zebra mussels (0.08%, 24% and 24%, respectively). These results suggest the consumptive resistance to its invasion in Britain has been low and, correspondingly, if there is a management desire to further limit the invasion of zebra mussels then relying on biological resistance to limit their invasion appears to be insufficient.
      PubDate: 2022-06-01
       
  • Effects of the analysed variable set composition on the results of
           distance-based morphometric surveys

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      Abstract: Distance-based morphometry is still widely used in ichthyology. Beside others, this methodology is often used to characterise species or to compare intraspecific group (i.e. population level) differences. However, scarce information is available about: (a) which are the most widely used variables for these purposes, (b) how certain variables are selected for the morphometric analyses, and (c) how variable set compositions and the number of variables affect the results. To answer these questions, a literature review was compiled and our own three datasets were analysed. The results showed that although a high number of variables can be used, previous authors have measured “common” ones most often, regardless of the taxonomic position of the studied group and the goal of the survey. Additionally, our review showed that authors rarely made a variable selection and often did not standardise their datasets; these are methodical problems that make the accuracy and usability of the results questionable. Analyses of our own three datasets showed that the number of variables and the variable set compositions in most cases strongly influenced stock subdivision and the percentage of correctly classified individuals. It was also shown that the most useable variable sets for morphometric purposes can differ considerably depending on the taxon and goal of the survey.
      PubDate: 2022-06-01
       
  • Feeding and trophic ecology of Antarctic toothfish Dissostichus mawsoni
           in the Amundsen and Dumont D’Urville Seas (Antarctica)

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      Abstract: Fisheries ecosystem-based management is an important tool for sustainable harvesting of fisheries worldwide. Knowledge of trophic interactions is crucial since changes in trophic balances can induce severe changes in the structure of marine communities. While advocated for deep-sea fisheries, a lack of studies in the benthopelagic area persist. The Antarctic toothfish, Dissostichus mawsoni, is a top predator inhabiting the Southern Ocean deep-sea and a high-value species in a fishery managed by CCAMLR (Commission for the Conservation of Antarctic Marine Living Resources). Previous studies suggested a geographical variability in its diet, but never studying it in the same year. We analysed stomach contents and stable isotopes of δ15N and δ13C in the muscle of D. mawsoni captured in three fishing areas from the Amundsen and Dumont D’Urville Seas, during the 2016/17 fishing season. Although significant spatial differences were found, five taxa were found in all sites, Antimora rostrata, Macrourus spp., Muraenolepis spp., Moroteuthopsis longimana and Psychroteuthis glacialis. High diversity of prey confirms D. mawsoni as a generalist feeder. Values of δ15N showed similar trophic position across areas, in contrast to the differences found in δ13C values. GLM showed that δ15N and δ13C values varied with otolith length, latitude and the opposite isotope, i.e. δ13C and δ15N respectively. Implications for D. mawsoni fisheries management are discussed considering different predation release scenarios.
      PubDate: 2022-06-01
       
  • Phytoplankton dynamics and bloom events in oligotrophic Mediterranean
           lagoons: seasonal patterns but hazardous trends

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      Abstract: Detailed seasonal analyses of phytoplankton assemblages’ composition were performed on long-term datasets (20 years) of two oligotrophic Mediterranean lagoons (Diana and Urbino), in order to test if phytoplankton community and bloom events patterns rely on a seasonal basis. Our results highlight a similar phytoplankton composition between the lagoons, but different patterns in terms of phytoplankton abundances, of timing, magnitude and occurrence of Taxonomic Units, and of bloom events occurrence. Dominant diatoms group showed a seasonal repartition, with highest contribution of Skeletonema sp. during winter and spring, some other groups emerging in warmer seasons (e.g. Chaetoceros spp.), or not showing marked seasonality (e.g. Pseudo-nitzschia spp.). Dinoflagellates’ abundances were higher during autumn, besides exhibiting punctual proliferations over the year. Salinity was the strongest environmental parameter in controlling Diana lagoon phytoplankton community, while Urbino community was mostly controlled by turbidity. A worrying evolution of the toxic diatom Pseudo-nitzschia spp., linked to salinity and temperature changes, was detected in both lagoons. We further demonstrated changes in the phytoplankton community are ongoing in these lagoons, despite their contrasting human pressure contexts, indicating that serious impacts on phytoplankton dynamics and blooms triggering in Mediterranean lagoons shall be foreseen within the current and forecasted climate change scenarios.
      PubDate: 2022-06-01
       
  • Congruence and responsiveness in the taxonomic compositions of Amazonian
           aquatic macroinvertebrate and fish assemblages

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      Abstract: Stream degradation in Amazonia is outpacing our ability to effectively monitor it for three key reasons: (1) Many changes are cumulative and occur gradually; (2) Scientists have failed to clearly link anthropogenic disturbances with ecological and economic indicators of concern to decision makers and the public; (3) There are too many potential indicators to assess in a cost-effective manner. Therefore, we sought to assess congruency at three taxonomic resolutions (species, genus and family) and between assemblages (fish species and macroinvertebrate genera) and groups of taxa (fish: Characiformes and Siluriformes; macroinvertebrates: Anisoptera, Heteroptera, Odonata, Trichoptera, Zygoptera, EPT [Ephemeroptera, Plecoptera and Trichoptera] and THZ [Trichoptera, Heteroptera and Zygoptera]). To do so, we assessed taxonomic, land-use and habitat data from 92 stream sites in the eastern Amazonian state of Pará. We found that anthropogenic disturbances of our sites influenced abundance and incidence of macroinvertebrate and fish taxa, but the two assemblages responded to slightly different stressors. Family and genera levels were suitable substitutes for similarity patterns measured at the macroinvertebrate genera and fish species levels, respectively. Odonata, Trichoptera, EPT and THZ were highly congruent with whole macroinvertebrate assemblage (genus level) variation. Characiformes was also congruent with whole fish assemblage (species level) variation. Congruence among macroinvertebrates and fish was intermediate (55% to 79%) and related to differing responses to environmental variables. Our results suggest that some groups (e.g., Odonata, Trichoptera and Characiformes) are useful surrogates of macroinvertebrate or fish assemblages to evaluate anthropogenic disturbance in Amazonian streams.
      PubDate: 2022-06-01
       
  • Likely year-round presence of beaked whales in the Bay of Biscay

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      Abstract: Beaked whales are cryptic and difficult to study species, often distributed in deep offshore waters and only briefly visible at the surface. A diverse range of cetacean species has been documented in the Bay of Biscay, including several species of beaked whales. However, little is known about how persistent their presence is. Citizen science data collected during ferry-based surveys between 2006 and 2018 were analysed to investigate how encounter rates varied across space and time, and their drivers for beaked whale species. Approximately 244,400 km were surveyed, and there were 419 encounters with beaked whales recorded including Cuvier’s beaked whales, (n = 260), Northern bottlenose whales (n = 19), Sowerby’s beaked whales (n = 13), and True’s beaked whales (n = 1). Generalized Additive Models revealed that encounters were generally more frequent in the southern bay, on northern facing slopes, with all species except Sowerby’s showing a preference for both deep waters and shallow shelf waters. Animals were recorded in each of the eight surveyed months, suggesting that beaked whales may be present year-round, with increased encounter rates in summer months. This study is the first to indicate that beaked whales may persist in this area throughout the year, which is key information for appropriate management.
      PubDate: 2022-06-01
       
  • Unravelling chironomid biodiversity response to climate change in
           subarctic lakes across temporal and spatial scales

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      Abstract: We combined paleolimnological reconstructions and space-for-time substitutions to unravel chironomid biodiversity responses to climate change in subarctic mountains across temporal and spatial scales. Using sediment records, we found that long-term temporal changes in chironomid taxonomic diversity were mainly induced by the temperature tolerance/optimum of species, while little changes in functional diversity were found due to the replacement of similar functional-type taxa within the community. Overall, paleolimnological reconstructions suggested the selection of larger chironomid species by long-term climate cooling and little changes in trophic guilds. Space-for-time substitutions showed, however that low-elevation lakes with forested have more sediment-feeding taxa and larger larvae than high-elevation lakes, thus, suggesting the selection of large chironomid morphotypes with a sediment-feeding mode under warmer climate. Space-for-time substitutions and paleolimnological reconstructions, therefore, gave contrasting results for the link between climate and functional diversity of chironomid communities, likely because space-for-time substitutions failed to match the extent of both spatial and temporal climatic gradients. We suggest that future studies must address biodiversity issues across both temporal and spatial scales as an improved understanding of biodiversity responses to climate change may help us to understand how biodiversity will be affected by ongoing and future change.
      PubDate: 2022-05-11
       
 
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