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497 results for “stickleback”
Genome-phenotype-environment associations identify signatures of selection in a panmictic population of threespine stickleback
<p>Adaptive genetic divergence occurs when selection imposed by the environment causes the genomic component of the phenotype to differentiate. However, genomic signatures of natural selection are usually identified without information on which trait is responding to selection by which selective agent(s). Here we integrate whole-genome-sequencing with phenomics and measures of putative selective agents to assess the extent of adaptive divergence in threespine stickleback occupying the highly heterogeneous lake Mývatn, NE Iceland. We find negligible genome-wide divergence, yet multiple traits (body size, gill raker structure and defence traits) were divergent along known ecological gradients (temperature, predatory bird densities and water depth). SNP-based heritability of all measured traits was high (h<sup>2</sup> = 0.42 – 0.65), indicating adaptive potential for all traits. Whilst environment-association analyses identified thousands of loci putatively involved in selection, related to genes linked to neuron development and protein phosphorylation, only loci linked to pelvic spine length were concurrently linked to environmental variation (water depth) – supporting the conclusion that divergence in pelvic spine length occurred in face of gene flow. Our results suggest that whilst there is substantial genetic variation in the traits measured, phenotypic divergence of Mývatn stickleback is mostly weakly associated with environmental gradients, potentially as a result of substantial gene flow. Our study illustrates the value of integrative studies that combine genomic assays of multivariate trait variation with landscape genomics.</p>
Going, going, gone: evidence for loss of an endemic species pair of threespine sticklebacks (Gasterosteus aculeatus) with implications for protection under species-at-risk legislation
<p>Genomic extinction occurs when the unique combination of genetic traits that characterize distinct phenotypes is eliminated by introgressive hybridization even if population size is greater than zero. Benthic and limnetic threespine sticklebacks (<em>Gasterosteus aculeatus</em>) constitute reproductively isolated undescribed biological species that have evolved independently in several lakes in southwestern British Columbia, Canada (known as "species pairs" in each lake). Here we investigated whether the two species that comprise the pair from Enos Lake, southeastern Vancouver Island, remain as two distinct gene pools. Multi-season samples (>1200 fish) obtained over two years from throughout the lake and assayed for variation in morphological traits characteristic of the two species (i.e., body depth, dorsal spine count, gill raker counts) and at 12 microsatellite DNA loci consistently indicated the existence of only a single group of sticklebacks. There was no consistent evidence of two groups in any morphological trait, and mean gill raker counts were consistently intermediate (20–21) to those of known benthics (~18) and limnetics (~24) which together comprised strikingly bimodal distributions in historical samples. Genetic analyses employing model-based clustering also consistently indicated the presence of only a single genetic group of sticklebacks. Compared to historical samples and to benthics and limnetics from other lakes, no Enos Lake fish could be identified confidently as a pure benthic or limnetic. Our results provide the strongest evidence yet that the Enos Lake sticklebacks now consist of a single morphological and genetic population of sticklebacks, that the unique combination of genetic and morphological traits that characterized benthic and limnetic sticklebacks no longer exist, and that their current status under Canada's <em>Species-at Risk Act</em> as Endangered should be re-evaluated.</p>
Effects of early predation and social cues on the relationship between laterality and personality in the Threespined stickleback
<p>Individual differences in laterality and personality are expected to covary, as emotions are processed differently by the two hemispheres and personality involves emotional behavior. Fish species are often used to investigate this topic due to the large variability in personality and laterality patterns. While some species show a positive relationship between lateralization strength and boldness, others show a negative relationship, and some show no relationship. To investigate whether this relationship follows changes in laterality and personality, we conducted a fully factorial design experiment manipulating predation and group size during early development. Results showed that the strength of laterality was influenced by predation threat, while social tendency and boldness were influenced by group size. These findings suggest that early life conditions can have an impact on laterality and social behavior. The relationship between laterality and personality traits, while present, was heavily influenced by the specific trial conditions, but not by the different developmental conditions.</p>
Inferred genetic architecture underlying evolution in a fossil stickleback lineage
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Data to: Carotenoids-based reddish pelvic spines in non-reproducing female and male sticklebacks (Gasterosteus aculeatus) – signalling social dominance?
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Data from: Attractive male sticklebacks carry more oxidative DNA damage in the soma and germline
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Microhabitat contributes to microgeographic divergence in threespine stickleback
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Data from: Genetic divergence outpaces phenotypic evolution among threespine stickleback populations in old freshwater habitats
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Data from: Plasticity contributes to a fine-scale depth gradient in sticklebacks’ visual system
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Data from: A phylogenomic perspective to diversity, hybridization and evolutionary affinities in the stickleback genus Pungitius
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Shedding light on the threespine stickleback circadian clock
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Scripts from: Ancient stickleback genomes reveal the early stages of parallel adaptation
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Multi-generation selective landscapes and sub-lethal injuries in stickleback
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Data for: Repeated genetic divergence plays a minor role in repeated phenotypic divergence of lake-stream stickleback
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Data from: Phenotypic flexibility in background-mediated color change in sticklebacks
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Pelvic spine reduction affects diet but not gill raker morphology in two polymorphic brook stickleback (Culaea inconstans) populations
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Data from: The genomic signature of ecological divergence along the benthic-limnetic axis in allopatric and sympatric threespine stickleback
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Genetics of mercury accumulation in Stickleback, genotypes and metal accumulation phenotypes
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Effects of early predation and social cues on the relationship between laterality and personality in the Threespined stickleback
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Evolution of thermal physiology alters the projected range of threespine stickleback under climate change
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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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.