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115 results for “brown trout”
Data from: Long-term mark-recapture and growth data for large-sized migratory brown trout (Salmo trutta) from Lake Mjøsa, Norway
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Repeated elevational clines of early life-history traits and their proximate mechanisms in brown trout
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Data from: The effects of Medieval dams on genetic divergence and demographic history in brown trout populations
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Data from: Potential of a no-take marine reserve to protect home ranges of anadromous brown trout (Salmo trutta)
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Oxygen consumption of juvenile brown trout, Salmo trutta, under varying thermal conditions during embryogenesis
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Temperature regime during embryogenesis alters subsequent behavioural phenotypes of juvenile brown trout
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Data from: Effects of host genetics and environment on egg-associated microbiotas in brown trout (Salmo trutta)
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Data from: Hybridization between genetically modified Atlantic salmon and wild brown trout reveals novel ecological interactions
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Data from: Consumption of carotenoids not increased by bacterial infection in brown trout embryos (Salmo trutta)
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Data from: Melanin in a changing world: brown trout coloration reflects alternative reproductive strategies in variable environments
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Data from: No additive genetic variance for tolerance to ethynylestradiol exposure in natural populations of brown trout (Salmo trutta)
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Data from: Maternal allocation of carotenoids increases tolerance to bacterial infection in brown trout
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F I G U R E 3 in Differences in growth between offspring of anadromous and freshwater brown trout Salmo trutta
F I G U R E 3 Temperature from fertilization on 9 November 2018 to hatching (1) and start of feeding (2) of Salmo trutta eggs incubated in cold (solid line) and hot (broken line) water
STR data from: Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population
<p><span>Maintaining standing genetic variation is a challenge in human-dominated landscapes. We used genetic (i.e., 16 short tandem repeats) and morphological (i.e., length and weight) measurements of 593 contemporary and historical brown trout (<i>Salmo trutta</i>) samples to study fine-scale and short-term impacts of different management practices. These had changed from traditional breeding practices, using the same broodstock for several years, to modern breeding practices, including annual broodstock replacement, in the transnational subarctic Pasvik River. Using population genetic structure analyses (i.e., Bayesian assignment tests, DAPCs, and PCAs), four historical genetic clusters (E2001A-D), likely representing family lineages resulting from different crosses, were found in zone E. These groups were characterized by consistently lower genetic diversity, higher within-group relatedness, lower effective population size, and significantly smaller body size than contemporary stocked (E2001E) and wild fish (E2001F). However, even current breeding practices are insufficient to prevent genetic diversity loss and morphological changes as demonstrated by on average smaller body sizes and recent genetic bottleneck signatures in the modern breeding stock compared to wild fish. Conservation management must evaluate breeding protocols for stocking programs and assess if these can preserve remaining natural genetic diversity and morphology in brown trout for long-term preservation of freshwater fauna. </span></p>
FIGURE 2 in A new perspective on the molecular dating of the brown trout complex with an extended phylogeographic information on the species in Serbia
FIGURE 2 Median-joining network of CR mtDNA sequences. Haplotypes are represented by colored circles (supplementary table S1), with individual colors corresponding to the different lineages. The haplotypes found in the present study are framed, and for those, the size of the circles is proportional to the haplotype frequencies in the sample. Mutations are represented by hatch marks on the lines connecting the haplotypes. Missing or theoretical haplotypes are shown as black dots.
FIGURE 1 in A new perspective on the molecular dating of the brown trout complex with an extended phylogeographic information on the species in Serbia
FIGURE 1 Map of sampling locations. The names and codes of the sampling sites are listed in table 1. Dots on the map represent sampling locations, while river drainages are indicated by different colors, as in the legend. Colored pie charts around the map represent the distribution and frequencies of mitochondrial DNA control region haplotypes per site.
Data from: Strong divergence in trait means but not in plasticity across hatchery and wild populations of sea-run brown trout Salmo trutta
There is ample evidence that organisms adapt to their native environment when gene flow is restricted. However, evolution of plastic responses across discrete environments is less well examined. We studied divergence in means and plasticity across wild and hatchery populations of sea-run brown trout (Salmo trutta) in a common garden experiment with two rearing environments (hatchery and a nearly natural experimental stream). Since natural and hatchery environments differ, this arrangement provides an experiment in contemporary adaptation across the two environments. A QST-FST approach was used to investigate local adaptation in survival and growth over the first summer. We found evidence for divergent selection in survival in one year and in body length in both years and rearing environments. In general, the hatchery populations had higher survival and larger body size in both environments. QST in body size did not differ between the rearing environments and constitutive divergence in the means was in all cases stronger than divergence in the plastic responses. These results suggest that in this system constitutive changes in mean trait values are more important for local adaptation than increased plasticity. In addition, ex-situ rearing conditions induce changes in trait means that are adaptive in the hatchery, but potentially harmful in the wild, suggesting that hatchery rearing is likely to be a sub-optimal management strategy for trout populations facing selection in the stream environment.
Data from: Acclimation temperature changes spermatozoa flagella length relative to head size in brown trout
Temperature is a ubiquitous environmental factor affecting physiological processes of ectotherms. Due to the effects of climate change on global air and water temperatures, predicting the impacts of changes in environmental thermal conditions on ecosystems is becoming increasingly important. This is especially crucial for migratory fish, such as the ecologically and economically vital salmonids, because their complex life histories make them particularly vulnerable. Here, we addressed the question whether temperature affects the morphology of brown trout, Salmo trutta L. spermatozoa. The fertilising ability of spermatozoa is commonly attributed to their morphological dimensions, thus implying direct impacts on the reproductive success of the male producing the cells. We show that absolute lengths of spermatozoa are not affected by temperature, but spermatozoa from warm acclimated S. trutta males have longer flagella relative to their head size compared to their cold acclimated counterparts. This did not directly affect sperm swimming speed, although spermatozoa from warm acclimated males may have experienced a hydrodynamic advantage at warmer temperatures, as suggested by our calculations of drag based on head size and sperm swimming speed. The results presented here highlight the importance of increasing our knowledge of the effects of temperature on all aspects of salmonid reproduction in order to secure their continued abundance.
Dendritic prioritization through spatial stream network modeling informs targeted management of Himalayan riverscapes under brown trout invasion
<p>With the concept of 'riverscapes' long pending to be acknowledged in the 'landscape-centric' legislative framework of Himalayan nations, conservation of native riverine species stays practically unheeded. This necessitates urgent prioritization of stream networks to conserve the lotic taxa under invasion pressures. Himalayan riverscapes are pervaded with the invasive-exotic brown trout <i>Salmo trutta</i>,<i> </i>posing serious threats to the co-occurring native, the snow trout <i>Schizothorax richardsonii</i>. Using intensive surveys (218.7km) and geostatistical stream network models (n=537), we contrasted snow trout in two stream networks with and without invasives, for assessing differences in their spatial distribution. Our models indicate invasion-induced relegations of natives from the river mainstem into headwaters, with large sections of mainstem occupied by invasives. Furthermore, a concerningly small percentage of potential habitat left for natives to occupy in the mainstem is threatened, where a 100% overlap of native and invasive trout distributions is predicted. With a higher presence probability for the natives in headwaters of invaded watershed as compared to the non-invaded watershed, we highlight the headwater streams as<b> </b>potential refugia for the natives under invasion.</p> <p><i>Synthesis and Applications: </i>Our approach of basin-scale dendritic prioritization provides immediate management solutions to tackle brown trout invasion threats in Himalaya. We inform decisions on delineation of headwaters as invasion refugia for native fish, with assisted recovery of their fragmented populations in the river mainstems through targeted management of invasives</p>
Data from: Acclimation temperature changes spermatozoa flagella length relative to head size in brown trout
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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.