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115 results for “brown trout”
Figure 4 in Feeding habit of Brown trout (Salmo trutta fario) in upper parts of river Swat, Pakistan
Figure 4. Full gut weight and gut contents among various length groups.
Size, connectivity and edge effects of stream habitats explain spatiotemporal variation in brown trout (Salmo trutta) density
<p>Ecological theory postulates that size and isolation of habitat patches impact the colonization/extinction dynamics that determine community species richness and population persistence. Given the key role of lotic habitats for life history completion in rheophilic fish, evaluating how the distribution of swift-flowing habitats affects the abundance and dynamics of subpopulations is essential. Using extensive electrofishing data, we show that merging island biogeography with meta-population theory, where lotic habitats are considered as islands in a lentic matrix, can explain spatiotemporal variation in occurrence and density of brown trout (Salmo trutta). Subpopulations in larger and less isolated habitat patches had higher average densities and smaller between-year density fluctuations. Larger habitat patches also had lower predicted risk of excessive zero catches, indicative of lower extinction risk. Trout density further increased with distance from the edge of adjacent lentic habitats with predator (Esox lucius) presence, suggesting that edge- and matrix-related mortality contributes to the observed patterns. These results can help reduce the negative impacts that habitat loss and fragmentation have on biodiversity, by stressing the importance of suitable habitat size and connectivity, and aid in prioritization of habitat restoration, dam removal and reintroduction programs aimed at vitalizing declining and locally extinct riverine fish populations.</p>
Associations between metabolic traits and growth rate in brown trout (Salmo trutta) depend on thermal regime
<p class="academicstyle"><span><span><span><span><span><span><span><span><span><span><span>Metabolism defines the energetic cost of life, yet we still know relatively little about why intraspecific variation in metabolic rate arises and persists. Spatiotemporal variation in selection potentially maintains differences, but relationships between metabolic traits (standard metabolic rate (SMR), maximum metabolic rate (MMR), and aerobic scope) and fitness across contexts are unresolved. We show that associations between SMR, MMR, and growth rate (a key fitness-related trait) vary depending on thermal regime (a potential selective agent) in offspring of wild-sampled brown trout from two populations reared for ~15 months in either a cool or warm (+ 1.8°C) regime.<i> </i>SMR was positively related to growth in the cool, but negatively related in the warm regime. The opposite patterns were found for MMR and growth associations (positive in warm, negative in cool regime). Mean SMR, but not MMR, was lower in warm regimes within both populations (i.e., basal metabolic costs were reduced at higher temperatures), consistent with an adaptive acclimation response that optimises growth. Metabolic phenotypes thus exhibited a thermally sensitive metabolic 'floor' and a less flexible metabolic 'ceiling'. Our findings suggest a role for growth-related fluctuating selection in shaping patterns of metabolic variation that is likely important in adapting to climate change.</span></span></span></span></span></span></span></span></span></span></span></p>
Data from: Carry-over effects of environmental stressors influence the life performance of brown trout
<p>Here, we focused on the carry-over effects of excessive sedimentation on the early life stages of brown trout in a multiphase experiment. First, we experimentally tested the influence of fine sediments (organic matter (OM) and inorganic sand, both <2.0 mm in diameter) on the metabolic rate (MO<sub>2</sub>), size, emergence, escape responses and survival of the relevant brown trout embryonic stage (egg, alevin or fry) in indoor experimental channels. Second, we mimicked the movements of parr to a more suitable habitat if available in natural rivers and transported parr to either their original or different treatments in outdoor experimental channels and remeasured their metabolic rate and size. </p>
SNP genotype dataset from brown and anadromous trout
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Data from: Genetic monitoring of brown trout released into a novel environment: Establishment and genetic impact on natural populations
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Stronger parental than temperature effects on methylation in juvenile brown trout (Salmo trutta)
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Data from: Invasive Eurasian minnow alters the trophic niche and growth of brown trout in high-latitude lakes
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Size, connectivity and edge effects of stream habitats explain spatiotemporal variation in brown trout (Salmo trutta) density
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Data from: Genetic consequences of improved river connectivity in brown trout (Salmo trutta)
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Testing for population differences in evolutionary responses to pesticide pollution in brown trout (Salmo trutta)
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Whole-genome resequencing confirms reproductive isolation between sympatric demes of brown trout (Salmo trutta) detected with allozymes
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Associations between metabolic traits and growth rate in brown trout (Salmo trutta) depend on thermal regime
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Data from: Mitochondrial function predicts dominance status in brown trout
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Brown trout 29-year dataset - Glenariffe Stream, New Zealand
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Supplementary information for: Redundancy analysis, genome-wide association studies, and the pigmentation of brown trout (Salmo trutta L.)
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Archived data for: Balancing selection, genetic drift, and human mediated-introgression interplay to shape MHC (functional) diversity in Mediterranean brown trout
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Data from: Long-term mark-recapture and growth data for large-sized migratory brown trout (Salmo trutta) from Lake Mjøsa, Norway
<p>This data package contains two unique publicly available time series of individual-based data originating from a 51-year mark-recapture study of a land-locked population of large-sized migratory brown trout (<em>Salmo trutta</em>) in Norway: the Hunder trout. In the period 1966-2015, nearly 14,000 adult Hunder trout have been captured and individually marked during their spawning migration from Lake Mjøsa to the river Gubrandsdalslågen. Almost a third of those individuals were later recaptured alive during a later spawning run and/or captured by fishermen and reported dead or alive. This has resulted in the first data series: a mark-recapture-recovery dataset spanning half a century and more than 18,000 capture records. The second data series consists of additional data on juvenile and adult growth and life-history schedules from half of the marked individuals, obtained by means of scale sample analysis. The two datasets offer a rare long-term perspective on individuals and population dynamics and provide unique opportunities to gain insights into questions surrounding management, conservation, and restoration of migratory salmonid populations and freshwater ecosystems.<br> </p>
Oxygen consumption of juvenile brown trout, Salmo trutta, under varying thermal conditions during embryogenesis
<p>Climate change is predicted to increase the future thermal conditions in northern latitudes with the potential effect of altering the metabolic scope and potential fitness of aquatic ectotherms. We experimentally tested the effect of elevated egg incubation temperature on the metabolic scope in juvenile brown trout (<i>Salmo trutta</i>). Brown trout cohorts from anadromous and resident crosses were raised from egg through exogenous feeding of juveniles in either natural river temperatures (cold) or elevated (+ 3 °C, warm) temperatures. In respirometry studies, we measured oxygen consumption rates of juvenile trout from both incubation temperatures and all possible breeding crosses after they were feeding exogenously and at an ambient temperature of 13 °C. These measures were taken over a period where the trout were resting, allowing for the determination of standard metabolic rate (SMR), and followed by a chase to exhaustion allowing for the measure of the maximum metabolic rate (MMR). The aerobic scope (AS) of these juveniles from four anadromous-resident crosses and from both incubation temperatures could then be calculated as AS = MMR – SMR. This dataset represents a key to all respiration trials including: fish embryonic incubation temperature, parental cross, fish total length (mm), calculated mass (g) per fish, ventilation rate (opercular beats/min), and water temperature per respiration trial. For each fish tested, the dissolved oxygen levels in the respirometry chamber were recorded continuously through periods of static respiration and recharge flow in 15 sec intervals for the duration of the trial testing periods (~ 5-7 hrs). These data were evaluated for SMR and MMR using a respiration program (respR) in the R statistical program.</p>
Data from: Hybridization between genetically modified Atlantic salmon and wild brown trout reveals novel ecological interactions
Interspecific hybridization is a route for transgenes from genetically modified (GM) animals to invade wild populations, yet the ecological effects and potential risks that may emerge from such hybridization are unknown. Through experimental crosses, we demonstrate transmission of a growth hormone transgene via hybridization between a candidate for commercial aquaculture production, GM Atlantic salmon (Salmo salar), and closely related wild brown trout (S. trutta). Transgenic hybrids were viable and grew more rapidly than transgenic salmon and other non-transgenic crosses in hatchery-like conditions. In stream mesocosms designed to more closely emulate natural conditions, transgenic hybrids appeared to express competitive dominance and suppressed the growth of transgenic and non-transgenic (wild-type) salmon by 82% and 54%, respectively. To the best of our knowledge, this is the first demonstration of environmental impacts of hybridization between a GM animal and a closely related species. These results provide empirical evidence of the first steps towards introgression of foreign transgenes into the genomes of new species and contribute to the growing evidence that transgenic animals have complex and context-specific interactions with wild populations. We suggest that interspecific hybridization be explicitly considered when assessing the environmental consequences should transgenic animals escape to nature.
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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.