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1,017 results for “freshwater fish”
FIGURE 2 in Environmental correlates of adaptive diversification in postglacial freshwater fishes
FIGURE 2 Legend on next page.
Figure 1 in A histopathological study on the freshwater fish species chub (Squalius cephalus) in the Karasu River, Turkey
Figure 1. Map of Erzurum city and the basin of the Karasu River showing the three sampling sites.
Data From: Fit and fatty freshwater fish: Contrasting polyunsaturated fatty acid phenotypes between hybridizing stickleback lineages
<p>Long-chain polyunsaturated fatty acids are biologically important lipids that are unevenly distributed between and throughout environments. This heterogeneity can affect the evolution of metabolic processes, as populations adapt to the resource landscape that they encounter. Here, we compare fatty acid phenotypes of stickleback over two time scales of evolutionary divergence: between two lineages with different metabolic capacities for fatty acid synthesis (i.e. different copy number of the fatty acid desaturase gene; FADS2) that independently colonized European freshwaters during the Pleistocene and Holocene; and between two ecotypes within each lineage that have diverged more recently (~150 years) in different habitats (i.e. lake and stream). We measured fatty acid profiles of wild-caught and lab-reared fish for each lineage and ecotype combination after rearing lab fish on a diet deficient in omega-3 long-chain polyunsaturated fatty acids. Since these lineages hybridize in nature, we also measured profiles of lab-reared hybrids and backcrosses raised on the same deficient diet. Wild fish showed strong compositional differences in fatty acids between habitats, lineages, and sexes. Common garden fish had generally lower polyunsaturated fatty acid levels than wild fish, and females had lower omega-6:omega-3 than males. Fish from the lineage with fewer FADS2 copies also had lower levels of docosahexaenoic acid. Overall, we document divergence in fatty acid phenotypes between stickleback lineages with different histories of freshwater colonization, and between ecotypes in the early stages of adaptive population divergence.</p>
Fish zeta diversity responses to human pressures and cumulative effects across a freshwater basin
<p><em><u><span>Aim</span></u><u><span>:</span></u> </em><span>Declining biodiversity across ecosystems and myriad human pressures necessitate high-level regional assessments for effective management. Evaluation of biodiversity patterns and stressor accumulation through beta diversity and cumulative effect analyses are two key methods for management prioritization. This study links these concepts to develop a novel cumulative effect metric based on beta diversity responses. </span></p> <p><em><u><span>Location:</span></u></em><em> </em><span>Fraser River basin, British Columbia, Canada.</span></p> <p><em><u><span>Methods:</span></u></em><em> </em><span>Multi-Site Generalized Dissimilarity Models were used to evaluate non-linear relationships between fish species compositional differences (</span><span>ζ<em><sub>n</sub></em>, number of shared species across any number of watersheds compared)</span><span> and human pressure, environmental, and geospatial differences among all watersheds and within low, mid-, and high elevation clusters. A cumulative effect metric was calculated as the sum of response values generated by the model for each human pressure variable specific to each watershed, when evaluated for </span><span>ζ<sub>2 </sub></span><span>(equivalent to pairwise beta diversity). This metric was tested against the Local Contribution of each watershed to Beta Diversity to determine whether watersheds with unique communities had low cumulative effects and are therefore candidates for conservation, and conversely, whether watersheds with non-distinctive communities had high cumulative effects and warrant restoration. Species Contributions to Beta Diversity were also assessed across the basin.</span></p> <p><em><u><span>Results:</span></u></em><em> </em><span>Zeta diversity across low elevation watersheds indicated stronger filtering by human pressures than mid- and high elevations, which showed more stochastic community assembly. The relative importance and response to human pressures varied based on the diversity component (i.e., total diversity including compositional nestedness vs. turnover) and order of zeta (number of watersheds compared). Cumulative effects were negatively related to community uniqueness, supporting the use of these metrics for developing management priorities.</span></p> <p><em><u><span>Main Conclusions:</span></u></em><em> </em><span>This assessment contributes to biodiversity conservation efforts by identifying important watersheds, species, and human pressures to manage, as well as providing a cumulative effect metric directly based on biodiversity responses.</span></p>
Alternative reproductive tactics in male freshwater fish influence the accuracy of species recognition
<p>Sexual conflict can result in coercive mating. Because males bear low costs of heterospecific mating, coercive males may engage in misdirected mating attempts toward heterospecific females. In contrast, sexual selection through consensual mate choice can cause mate recognition cues among species to diverge, leading to more accurate species recognition. Some species show both coercive mating and mate choice–associated courtship behaviors as male alternative reproductive tactics. We hypothesized that<br> if the selection pressures on each tactic differ, then the accuracy of species recognition would also change depending on the mating tactic adopted. We tested this hypothesis in the guppy (<em>Poecilia reticulata</em>) and mosquitofish (<em>Gambusia affinis</em>) by a series of choice experiments. <em>Poecilia reticulata</em> and <em>G. affinis</em> males both showed imperfect species recognition and directed all components of mating behavior towards heterospecific females. They tended to direct courtship displays more frequently towards conspecific than heterospecific females. With male <em>P. reticulata</em>, however, accurate species recognition disappeared when they attempted coercive copulation: they directed coercions more frequently towards heterospecific females. We also found that heterospecific sexual interaction had little effect on the fecundity of gravid females, which suggests that pre-pregnancy interactions likely underpin the exclusion of <em>G. affinis</em> by <em>P. reticulata</em> in our region.</p>
Database of freshwater fish species of the Amazonia Region in Colombia: records from ichthyological collections.
<p>The database corresponds to an exhaustive review of freshwater from the Amazonia Region records from the catalogs of scientific reference collections from different institutions. </p>
Timing and synchrony of migration in a freshwater fish: consequences for survival
<p>Animal migration is one of the most spectacular and visible behavioural phenomena in nature with profound implications for a range of ecological and evolutionary processes. Successful migration hinges on the ability to exploit temporary resources (e.g. food) and evade threats (e.g. predators) as they arise, and thus the timing of migration is often regarded as a dominant predictor of individual migratory success.</p> <p>However, with the exception of intensively studied taxa (mainly birds), relatively few studies have investigated inter-individual annual and seasonal variation in migratory timing and performance, or tested predictions on how migration across high and low predation-risk habitats may exert selection on migratory timing. In particular, studies that assess the survival consequences of variation in migratory timing remain rare, which is most likely due to the logistical challenges associated with monitoring survival success and population-level characteristics simultaneously.</p> <p>Here, we address the above-mentioned questions using roach Rutilus rutilus, a fish that migrates from lakes characterised by high-predation risk into low-risk streams during winter. Specifically, we used individual-based tracking of roach in two European lake systems over multiple migration periods (9 and 7 years, respectively), to obtain highly detailed (year-round scheduling, repeat journeys and the fate of individuals) data on the variability/synchrony of migratory timing in spring and autumn respectively.</p> <p>We report seasonal differences in the variability of migratory timing, with lower variance and higher migration synchrony in spring lake arrival timing as compared to autumn lake departure timing. Furthermore, the timing of autumn migration is more variable across years than the timing of spring migration. Secondly, we find that later arrival to the lake habitat is positively associated with apparent survival from one year to the next, whereas we found no effect of lake departure timing on survival probability.</p> <p>These findings represent rare evidence showing how intraspecific variation in timing in migratory fish differs across years and seasons, and how variation in timing can translate into survival consequences for prey in systems characterised by high predation risk. </p>
A paradoxical bias in knowledge about Norwegian freshwater fishes: Research efforts during 1980–2020
<p><span>Norwegian freshwater systems are in general species-poor. That is particularly the case for freshwater fishes. Only 32 species are considered native, whereas an additional 12 species are non-native. Some of the non-native species are also considered to be invasive and have negative ecosystem effects. Freshwater fishes are exposed to numerous stressors throughout their life cycle, many of which are of anthropogenic origin. In order to manage and conserve the diversity of fish there is a need for basic knowledge and understanding. Here I make an effort to review the published research on all Norwegian freshwater fish species during the 1980–2020 period, based on a standardized search on the Web of Science. Over 2000 relevant articles were retrieved and evaluated following the search. The research activity has been highly biased, with most research activity directed at a few species of high economic and societal value. Most work was directed at Atlantic salmon <em>Salmo</em> <em>salar</em> and brown trout <em>S</em>. <em>trutta</em>, and in general towards species within the salmonid family. Extremely little attention was directed at species such as the lampreys (four species) and sculpins (three species). Also, many species that have been listed on the Norwegian Red List during various time periods have not been given any particular attention. This lack of attention was also evident for most of the non-native species. The strong bias in research activity and lack of attention given to many species will clearly lead to difficulties in making appropriate management decisions. This is unfortunate, in particular at a time when climate change may lead to numerous ecosystem-level changes.</span></p>
Figure 1 in Risk screening of non-native freshwater fishes in Yunnan Province, China
Figure 1. Map of the study (risk screening) area (Yunnan Province in southwest China)
Using eDNA for monitoring fish and invertebrate biodiversity in freshwater ecosystems
<p>Global biodiversity is facing an extinction crisis leading to increasing pressure on industries to monitor their potential environmental impact. Relatedly, there is demand for more efficient biodiversity monitoring methods, resulting in growing interest in the use of environmental DNA (eDNA). Many questions, however, regarding the reliability of this relatively novel method remain, particularly for non-specialist end-users of the technology.</p> <p>Here, the use of commercially available (in the UK) eDNA assays for monitoring freshwater fish and invertebrate biodiversity was compared to conventional surveillance techniques. Samples were collected from different habitats, on varying spatial scales and using multiple sampling regimes to assess how eDNA results were affected.</p> <p>For aquatic macroinvertebrates and fish, more taxa were detected by eDNA than conventional surveys conducted in parallel, and for fish, all taxa detected by conventional monitoring were confirmed by eDNA.</p> <p>For aquatic macroinvertebrates, several species were only detected through conventional methods, and the number of families detected by eDNA was lower than for conventional monitoring at all sites.</p> <p>eDNA results varied significantly between sampling locations within lentic sites and, for lotic sites, with the number of subsamples collected.</p> <p>In terms of practical implications, this study demonstrates the need for bespoke sampling protocols when collecting eDNA samples. This study improves understanding of using eDNA for detecting aquatic taxa that could inform species surveillance protocols. These are essential if eDNA is to be used by practitioners as a regulatory monitoring tool.</p>
Figure 5 in Impact of alien fishes on the distribution pattern of indigenous freshwater fishes of Punjab, Pakistan
Figure 5. Loading of PCA showed that correlation among the four sites.
Figure 3 in Impact of alien fishes on the distribution pattern of indigenous freshwater fishes of Punjab, Pakistan
Figure 3.Families of fish species documented during surveys.
Fig. 1 in Helminth parasites of alien freshwater fishes in Patagonia (Argentina)
Fig. 1. Map of Argentinean Patagonia; the sampling localities of present study are shown.
Figure 1 in Trichodinid fauna of freshwater fishes with infestation indices in the Lower Kızılırmak Delta in Turkey and a checklist of trichodinids (Ciliophora: Trichodinidae) in Turkish waters
Figure 1. Sampling area and all geographical regions of Turkey.
Figure 4 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem
Figure 4. Variation of GSI for females and males of Atherina boyeri in the Hirfanlı Reservoir.
Figure 3 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem
Figure 3. Length frequency of Atherina boyeri in the Hirfanlı Reservoir.
Figure 2 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem
Figure 2. Age frequency of Atherina boyeri in the Hirfanlı Reservoir.
Figure 1 in Investigations of the nervous system biomarkers in the brain and muscle of freshwater fish (Oreochromis niloticus) following accumulation of nanoparticles in the tissues
Figure 1. TEM images of muscle (A) and brain (B) tissue samples of control fish (O. niloticus).
Time-calibrated phylogeny of Neotropical Freshwater Fishes
<p>The Neotropical Freshwater Fish (NFF) fauna exhibits the greatest phenotypic disparity and species richness among all continental aquatic vertebrate faunas, with more than 6,345 species distributed across the mostly tropical regions of Central and South America. The two several decades have seen a proliferation of molecular phylogenies, often at the species level, covering almost all 875 valid NFF genera. This study presents the most comprehensive genome-wide, time-calibrated phylogenetic hypothesis of NFF species to date, based on DNA sequences generated over decades through collaborative efforts of the multinational ichthyological research community. Our purpose is to compile an extensive dataset and organize it systematically, allowing for continuous refinement and expansion, thereby enabling researchers to evaluate macroevolutionary hypotheses in the NFF. Using thousands of DNA sequences from dozens of studies, we compiled a supermatrix of 51 markers across 5,984 taxa, comprising 3,167 species representing 50% of NFF species, and estimating divergence times based on a fossil-calibrated phylogenomic tree of fishes. We used this dataset to infer the most species-rich time-calibrated phylogeny of the NFF taxa to date, summarizing the collective efforts of the ichthyological research community since the midpoint of the last century. We hope this dataset provides a framework for forthcoming evolutionary studies of the NFF fauna, documenting macro-scale patterns in the world's most diverse continental vertebrate fauna.</p>
Figure 9 in Microplastics in commercial fish digestive tracts from freshwater habitats in Northern Thailand
Figure 9. Microplastic type and shape in the GIT of fish samples confirmed by FTIR.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.