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6,771 results for “freshwater”
Riverine flow rate drives widespread convergence in the shell morphology of imperiled freshwater mussels
<p>Frequent and strong morphological convergence suggests that determinism tends to supercede historical contingencies in evolutionary radiations. For many lineages living within the water-column of rivers and streams, hydrodynamic forces drive widespread morphological convergence. Living below the sediment-water interface may release organisms from these hydrodynamic pressures, permitting a broad array of morphologies and thus less convergence. However, here, we show that the semi-infaunal freshwater mussels have environmentally determined convergence in shell morphology. Using 3D morphometric data from 715 individuals among 164 Nearctic species, we find that species occurring in rivers with high flow rates have evolved traits that resist dislodgement from their burrowed position in the streambed: thicker shells for their body size, with the thickest sector of the shell being the most deeply buried. Species occurring in low-flow environments have evolved thinner and more uniformly thickened shells, corresponding to an alternative adaptation to dislodgement: increased burrowing efficiency. Within species, individuals also show increased shell thickness for their body size at higher flow rates, suggesting that ecophenotypy may, in part, be an important mechanism for establishing populations in new environments and thus evolutionary divergence in this highly imperiled invertebrate group.</p>
A key evolutionary step determining osmoregulatory ability for freshwater colonisation in early life stages of fish
<div class="page"> <div class="layoutArea"> <div class="column"> <p>Colonisation of freshwater habitats by marine animals is a remarkable evolutionary event that has enriched biodiversity in freshwater ecosystems. The acquisition of tolerance to hypotonic stress during early life stages is presumed to be essential for their successful freshwater colonisation, but very little empirical evidence has been obtained to support this idea. This study aimed to comprehend the evolutionary changes in osmoregulatory mechanisms that enhance larval freshwater tolerance in amphidromous fishes, which typically spend their larval period in marine (ancestral) habitats and the rest of their life history stages in freshwater (derived) habitats. We compared the life history patterns and changes in larval survivorship and gene expression depending on salinity among three congeneric marine-originated amphidromous goby species (<em>Gymnogobius</em>), which had been suggested to differ in their larval dependence on freshwater habitats. An otolith microchemical analysis and laboratory-rearing experiment confirmed the presence of freshwater residents only in <em>G. urotaenia</em> and higher larval survivorship of this species in the freshwater condition than in the obligate amphidromous <em>G. petschiliensis</em> and <em>G. opperiens</em>. Larval whole-body transcriptome analysis revealed that <em>G. urotaenia</em> from both amphidromous and freshwater-resident populations exhibited the greatest differences in expression levels of several osmoregulatory genes, including <em>aqp3</em>, which is critical for water discharge from their body during early fish development. The present results consistently support the importance of enhanced freshwater tolerance and osmoregulatory plasticity in larval fish to establish freshwater forms, and further identify key candidate genes for larval freshwater adaptation and colonisation in the goby group.</p> </div> </div> </div>
Figure 1 in A review of amphidromous freshwater fishes of the Chocó biogeographical region (Colombia and Ecuador): diversity, ecology, fisheries and conservation
Figure 1. – Map of the Chocó Biogeographical Region in the Pacific of Colombia and Ecuador.
Figure 2 in Growth, maximum daily ration and intraspecific cohabitation of the moray Gymnothorax polyuranodon (Muraenidae) in a freshwater aquarium
Figure 2. – Mean (± standard error) monthly water temperature in the aquarium in 2010.
Supplementary Files: processed model results for freshwater tracer concentration and filling/flushing time
<p>FWdye_avg_241yr_300yr: monthly and inter-annual mean tracer concentrations for model years 241 to 300.</p> <p>FWdye_outflux_avg_271yr_300yr: freshwater tracer sinks fluxes averaged for model years 271 to 300.</p> <p>FW_flux_avg_001yr_060yr: monthly averaged freshwater fluxes with seasonal and inter-annual variability for one cycle of COREII.</p> <p>filltime_basinWE_001yr_300yr: processed river water tracer filling time on shelf seas for model years 1 to 300.</p> <p>filltime_basinWE_01yr_60yr_1yrimpulse: processed flushing time for one year released impulse test for model years 1 to 60.</p>
Cryptic species of freshwater sculpin (Cottidae: Cottus) in California
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Divergent processes drive parallel evolution in marine and freshwater fishes
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Shell shape does not accurately predict self-righting ability in hatchling freshwater turtles
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Data from: Maternal diet influences fecundity in a freshwater turtle undergoing population decline
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Seasonal variation of behavior and brain size in a freshwater fish
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Data from: Landscape evolution drives continental diversification in Neotropical freshwater fishes of the family Erythrinidae (Teleostei, Characiformes)
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Data from: "Transcriptome resources for two non-model freshwater crustacean species" in Genomic Resources Notes accepted 1 October 2014 to 30 November 2014
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Variable freshwater influences on the abundance of vibrio vulnificus in a tropical urban estuary
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The population genomics of repeated freshwater colonizations by Gulf Pipefish
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Data from: Integrating ecological niche and hydrological connectivity models to assess the impacts of hydropower plants on an endemic and imperiled freshwater turtle
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Data from: Environmental DNA metabarcoding elucidates freshwater mussel diversity and occupancy to facilitate improved management and conservation
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Using eDNA for monitoring fish and invertebrate biodiversity in freshwater ecosystems
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Personality does not predict individual niche variation in a freshwater fish
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Ecological performance of native and invasive benthic freshwater fishes under elevated temperature
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Data from: Parasite resistance predicts fitness better than fecundity in a natural population of the freshwater snail Potamopyrgus antipodarum
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.