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228 results for “Guppy”
Data from: Study of regional differences in GC content values in chromosomes of the guppy and related fish species
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Data from: Mating preference for novel phenotypes can be explained by general neophilia in female guppies
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Data from: Quick-change artists: male guppies pay no cost to repeatedly adjust their sexual strategies
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Data from: Shoaling in the Trinidadian guppy: Costs, benefits, and plasticity in response to an ambush predator
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Data from: Demasculinization of male guppies increases resistance to a common and harmful ectoparasite
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Data from: Male mate choice in the Trinidadian guppy is influenced by the phenotype of audience sexual rivals
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Data from: Female sperm storage mediates postcopulatory costs and benefits of ejaculate anticipatory plasticity in the guppy
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Predation risk shapes the use of conflicting personal risk and social safety information in guppies
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Data from: Predation-associated differences in sex-linkage of wild guppy coloration
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Data from: Population genomics of natural and experimental populations of guppies (Poecilia reticulata)
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The role of boundary length and adjacent patch contrast in guppy mate choice: Dataset, Matlab and R codes
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Data from: Competitive asymmetry and local adaptation in Trinidadian guppies
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Data from: how to generate and test hypotheses about colour: insights from half a century of guppy research
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Data from: Gene flow from an adaptively divergent source causes rescue through genetic and demographic factors in two wild populations of Trinidadian guppies
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Data from: Beauty in the eyes of the beholders: color vision is tuned to mate preference in the Trinidadian guppy (Poecilia reticulata)
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A test of the role of associative learning in originating sexual preferences in the guppy
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Data from: Replicated origin of female biased adult sex ratio in introduced populations of the Trinidadian guppy (Poecilia reticulata).
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Data from: Temporally-variable predation risk and fear retention in Trinidadian guppies
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Novel parasite invasion leads to rapid demographic compensation and recovery in an experimental population of guppies
<p><a name="_Hlk35864018">The global movement of pathogens is altering populations and communities through a variety of direct and indirect ecological pathways. The direct effect of a pathogen on a host is reduced survival, which can lead to decreased population densities. However, theory also suggests that increased mortality can lead to no change or even increases in the density of the host. </a>This paradoxical result can occur in a regulated population when the pathogen's negative effect on survival is countered by increased reproduction at the lower density. Here we analyze data from a long-term capture-mark-recapture experiment of Trinidadian guppies (<i>Poecilia reticulata</i>) that was recently infected with a nematode parasite (<i>Camallanus cotti</i>). By comparing the newly infected population with a control population that was not infected we show that decreases in the density of the infected guppy population were transient. The guppy population compensated for the decreased survival by a density-dependent increase in recruitment of new individuals into the population, without any change in the underlying recruitment function. Increased recruitment was related to an increase in the somatic growth of uninfected fish. Twenty months into the new invasion, the population had fully recovered to pre-invasion densities even though the prevalence of infection of fish in the population remained high (72%). These results show that density-mediated indirect effects of novel parasites can be positive, not negative, which makes it difficult to extrapolate to how pathogens will affect species interactions in communities. We discuss possible hypotheses for the rapid recovery.</p>
Genetic and phenotypic diversity of guppy population pre- and post-flood disturbance
<p class="paragraph"><span>Rare extreme "black swan" disturbances can impact ecosystems in many ways, such as destroying habitats, depleting resources, and causing high mortality. In rivers, for instance, exceptional floods that occur infrequently (e.g., so-called "50-year floods") can strongly impact the abundance of fishes and other aquatic organisms. Beyond such ecological effects, these floods could also impact intraspecific diversity by elevating genetic drift or dispersal and by imposing strong selection, which could then influence the population's ability to recover from disturbance. And yet, natural systems might be resistant (show little change) or resilient (show rapid recovery) even to rare extreme events – perhaps as a result of selection due to past events. We considered these possibilities in two rivers where native guppies experienced two extreme floods - one in 2005 and another in 2016. For each river, we selected four sites and used archived "historical" samples to compare levels of genetic diversity and phenotypic mean traits before versus after floods. Genetic diversity was represented by 33 neutral microsatellite markers, and phenotypic diversity was represented by body length and male melanic (black) color. We found that genetic diversity and population structure was mostly <i>resistant</i> to even these extreme floods; whereas the larger impacts on phenotypic diversity were short-lived, suggesting additional <i>resilience</i>. We discuss the determinants of these two outcomes for guppies facing floods, and then consider the general implications for the resistance and resilience of intraspecific variation to black swan disturbances. </span></p>
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International Brain Laboratory public data
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OpenNeuro
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