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37 results for “river migration”
Figure 1 in Detailed analysis of beluga sturgeon (Huso huso) and stellate sturgeon (Acipenser stellatus) migration in the Lower Danube River
Figure 1. Locations with installed VR2W acoustic receivers 2011–2015.
Output and data used in publication "Glacial isostatic adjustment modulates lateral migration rate and morphology of the Red River (North Dakota, USA, and Manitoba Canada)" in GRL
<p>Here we provide the output sea level used to calculate change in slope along studied rivers as well as locations of meanders and cutoffs. Please see the read.me file and publication for details. </p>
Genetic monitoring of steelhead in the Klickitat River to estimate productivity, straying, and migration timing
<div> <p>Salmonids with complex life history variation present challenges for conservation management, but genetic approaches alongside fisheries monitoring can address questions regarding viability of natural populations. We genotyped adult (n=3,108) and juvenile (n=2,624) samples of anadromous <em>Oncorhynchus</em> <em>mykiss</em> that were collected in the Klickitat River, WA, USA at traps in the lower drainage to examine tributary level productivity, straying from outside sources and variation in adult migration timing. Genetic assignment of steelhead from this system indicated that the majority were produced within or near tributaries of the middle Klickitat River (juvenile mean = 72.8%; adult mean = 87.3%). Analyses with parentage-based tagging identified that most hatchery-origin adults were assigned to the Skamania Hatchery (80.8%) as expected since this has been the release stock for decades within the Klickitat River drainage. Hatchery-origin adults were also identified from programs operating outside the Klickitat River, which were primarily strays from Snake River hatcheries. Most natural-origin steelhead were assigned to the Klickitat River, but there were also natural-origin fish identified as strays from other regions of the Columbia River (22.3% of natural returns). We also examined genes known to be associated with migration timing in adult steelhead observed at the trap and observed a strong relationship between migration date and alleles for early and late migration, but individual outliers were detected across seasons. Our results indicate that genetic variation of steelhead in the Klickitat River has been influenced by hatchery programs as well as natural-origin straying from other sub-basins, but genetic diversity remains high throughout the sub-basin, and both early and late migration alleles are maintained. The genetic diversity present in Klickitat River steelhead may enable this Endangered Species Act listed (threatened) species to better adapt to stochastic environmental conditions compared to less diverse populations. </p> </div>
Data from: Bayesian species recognition and abundance estimation: Unravelling the mysteries of salmonid migration in the Teno River
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Monitoring Atlantic salmon (Salmo salar) smolt migration in a large river system using environmental DNA
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Genetic monitoring of steelhead in the Klickitat River to estimate productivity, straying, and migration timing
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Data from: Distribution of genetic variation underlying adult migration timing in steelhead of the Columbia River basin
<p>Fish migrations are energetically costly, especially when moving between fresh and saltwater, but are a viable strategy for Pacific salmon and trout (<i>Oncorhynchus </i>spp<i>.</i>) due to the advantageous resources available at various life stages. Anadromous steelhead (<i>O. mykiss</i>) migrate vast distances and exhibit variation for migration phenotypes that have a genetic basis at candidate genes known as <i>greb1L</i> and <i>rock1</i>. We examined the distribution of genetic variation at 13 candidate markers spanning <i>greb1L</i>, intergenic, and<i> rock1</i> regions versus 246 neutral markers for 113 populations (n = 9,471) of steelhead from inland and coastal lineages in the Columbia River. Patterns of population structure with neutral markers reflected genetic similarity by geographic region as demonstrated in previous studies, but candidate markers clustered populations by predominate genetic variation associated with migration timing. Mature alleles for late migration had the highest frequency overall in steelhead populations throughout the Columbia River, with only 9 of 113 populations that had a higher frequency of premature alleles for early migration. While a single haplotype block was evident for the coastal lineage, we identified multiple haplotype blocks for the inland lineage. The inland lineage had one haplotype block that corresponded to candidate markers within the <i>greb1L</i> gene and immediately upstream in the intergenic region, and the second block only contained candidate markers from the intergenic region. Haplotype frequencies had similar patterns of geographic distribution as single markers, but there were distinct differences in frequency between the two haplotype blocks for the inland lineage. Redundancy analyses were used to model environmental effects on allelic frequencies of candidate markers and significant variables were migration distance, temperature, isothermality, and annual precipitation. This study improves our understanding of the spatial distribution of genetic variation underlying migration timing in steelhead as well as associated environmental factors and has direct conservation and management implications.</p>
Data from: Environmental DNA analysis as a non-invasive quantitative tool for reproductive migration of a threatened endemic fish in rivers
Quantitative information regarding reproduction is essential for conserving endangered animals; however, some conventional quantitative methods can be damaging to the target population and their habitats. In the present study, the reproductive migration of a threatened endemic fish, three-lips (Opsariichthys uncirostris uncirostris), was non-invasively monitored by quantitative PCR of species-specific environmental DNA (eDNA), the usefulness of which has been under-studied. Water sampling and from-shore visual inspection were performed weekly along a tributary of Lake Biwa (Japan), where adult fish seasonally migrate upstream to reproduce as well as at lake sites near the river mouth. Species-specific eDNA was collected at all locations at times when the fish were visually observed and at certain sites where the fish were not observed. Log-transformed individual counts from visual inspection were positively correlated with log-transformed eDNA concentration in the river sites, indicating that eDNA analysis can be a reliable quantitative tool for fish abundance in rivers. Furthermore, distance from the lake did not influence eDNA concentration, suggesting that eDNA transport by river flow had a negligible effect on eDNA quantification. eDNA concentration and individual counts both gradually increased from May–July, then both decreased in August. Importantly, eDNA analysis showed that the fish occupied more habitats in the peak reproductive season and stayed for longer time at any given site. An additional underwater survey confirmed unexpected eDNA detections as true positives. eDNA analysis has great potential to quantitatively monitor reproductive fish migrations under certain conditions.
Sequential migrations of diverse fish community provide seasonally prolonged and stable nutrient inputs to a river
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Data and code for 'Transient knickpoint migrating modulated by fault activities on the Northeastern Tibetan Plateau margin: A case from the Yellow River '
<p> </p> <p>Kindly feel free to reach out to me (<a href="mailto:lizhch@smail.nju.edu.cn">lizhch@smail.nju.edu.cn</a>) if you have any queries or encounter issues with the 'codes'.</p>
Data from: Environmental DNA analysis as a non-invasive quantitative tool for reproductive migration of a threatened endemic fish in rivers
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Data from: Distribution of genetic variation underlying adult migration timing in steelhead of the Columbia River basin
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The Colorado River Delta and California's Central Valley are critical regions for many migrating North American landbirds
<p>Migration is an important component of some species full annual cycle. California's Central Valley and the Colorado River Delta provide important riparian and wetland habitats for migrating waterbirds in the arid west of North America, but little is known about whether these locations are important at the population level to migrating landbirds. We used eBird Status and Trends abundance data to quantify the importance of the Central Valley and Colorado River Delta to landbirds by estimating the proportion of the breeding population of 112 species that use each site during migration. We found that ~17 million landbirds use the Colorado River Delta in the spring and ~14 million in the fall. Across four study regions in the Central Valley, up to ~65 million landbirds migrate through in the spring and up to ~48 million in the fall. In the spring and fall, respectively, up to 37 and up to 30 species had at least 1% of their continental population migrate through the study regions. We also quantified the spatial concentration of each species across latitudinal transects to determine the extent to which study regions were acting as migratory bottlenecks. Landbird abundances were spatially concentrated in study regions 29.4% of all migration weeks, indicating that each study region acts as a migratory bottleneck. This application of eBird data is a powerful approach to quantifying the importance of sites to migrating birds. Our results provide evidence of population-level importance of the Central Valley and Colorado River Delta for many migratory landbirds.</p>
The Colorado River Delta and California’s Central Valley are critical regions for many migrating North American landbirds
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Genomic structure of the Sicklefin Barb, Puntioplites falcifer (Cyprinidae), in the lower Mekong River basin reveals patterns of both migration and population partitioning
<p>Effective management of the Sicklefin Barb, <i>Puntioplites falcifer</i>, with the planned construction of several dams in the Mekong River Basin depends upon disentangling conflicting reports of isolated populations and highly migratory behavior. We investigated patterns of population genomic structure, relatedness, and inferred connectivity among three locations on the Mekong and a fourth at Attapeu on the Sekong tributary. The results supported both isolation of populations and migratory behavior. STRUCTURE, AMOVA, and PCA revealed three distinct nDNA clusters. The most divergent nDNA cluster (pairwise <i>F</i><sub>ST</sub> ≥ 0.43, <i>p < </i>0.0001) exhibited negligible inferred relative migration rates with the other samples (<i>m</i> ≤ 0.02), including those from common sampling locations, and was likely a different species - putatively <i>P. proctozysron </i>(Ppr). However, mtDNA barcoding suggested differentiation between Ppr and a published mtDNA genome for this species. Most of the fish from the Sekong tributary belonged to a second distinct nDNA cluster and the sample from that location was differentiated from the Mekong sites (pairwise <i>F</i><sub>ST</sub> = 0.02 - 0.03, <i>p</i> < 0.0001). Supporting migration, a third nDNA cluster exhibited high rates of migration among the Mekong locations (<i>m</i> = 0.6 - 1) and was found in small numbers at the Sekong location which was characterized by intermediate migration rates with the Mekong (<i>m</i> = 0.3 - 0.4). Mitochondrial DNA barcoding indicated that the fish comprising the Mekong and Sekong nDNA clusters were differentiated from a <i>P. falcifer </i>mtDNA genome sampled well upstream of the Mekong locations in this study. Estimates of <i>N</i><sub>e</sub> by both location and nDNA cluster were near or below the minimal sustainable size (173-1651), suggesting susceptibility to over-exploitation or population fragmentation. Together, these results suggest that proposed hydropower dams could subdivide connected Mekong populations, isolate and split the Sekong population, and further drive down <i>N</i><sub>e</sub> if accommodations are not made to facilitate connectivity. Additionally, the combined pattern of nDNA and mtDNA diversity is consistent with substantial cryptic diversity and a <i>P. falcifer</i> – <i>P. proctozysron</i> species complex that could be further described with rigorous population genomic surveys and expanded geographic sampling.</p>
Genomic structure of the Sicklefin Barb, Puntioplites falcifer (Cyprinidae), in the lower Mekong River basin reveals patterns of both migration and population partitioning
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Southward retreat of the Keriya River drove human migration in the Taklimakan Desert during the late Holocene
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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.