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228 results for “Guppy”
The evolution of plasticity in brain morphology following colonization of an ecologically divergent habitat in Trinidadian guppies
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Data from: Developmental temperature, not inbreeding, shapes life history and locomotor behaviors in juvenile guppies (Poecilia reticulata)
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Compiling forty years of guppy research to investigate the factors contributing to (non)parallel evolution
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Adult predation shapes the evolution of swimming performance in guppies (Poecilia reticulata)
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Data from: Shoaling guppies evade predation but have deadlier parasites
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Data from: Morphological and functional maturity of the oral jaws covary with offspring size in Trinidadian guppies
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Data from: The quest for good genes: epigamic traits, fitness, MHC and multilocus heterozygosity in the guppy
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Data from: Integration between swimming and feeding evolves repeatedly in Trinidadian guppies and aligns with suction-feeding fishes
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Pace-of-life syndrome: linking personality, metabolism and colour ornamentation in male guppies
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Selection experiment on guppy ornamental traits
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Alarm cues and alarmed conspecifics: Neural activity during social learning from different cues in Trinidadian guppies
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Population regulation and density‐dependent demography in the Trinidadian guppy
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Datasets and scripts from: Sensory-based quantification of male colour patterns in Trinidadian guppies reveals no support for parallel phenotypic evolution in multivariate trait space
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Rapid neural DNA methylation responses to predation stress in Trinidadian guppies
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Immune challenge changes social behaviour in the Guppy (Poecilia reticulata)
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Data from: Female sperm storage mediates postcopulatory costs and benefits of ejaculate anticipatory plasticity in the guppy
<p>Males of many species evolved the capability of adjusting their ejaculate phenotype in response to social cues to match the expected mating conditions. When females store sperm for prolonged time, the expected fitness return of plastic adjustments of ejaculate phenotype may depend on the interval between mating and fertilization. While, prolonged female sperm storage (FSS) increases the opportunity for sperm competition, as a consequence of the longer temporal overlapping of ejaculates from several males, it may also create variable selective forces on ejaculate phenotype, for example by exposing trade-offs between sperm velocity and sperm survival. We evaluated the relationship between the plasticity of ejaculate quality and FSS in the guppy, <i>Poecilia reticulata</i>, a polyandrous livebearing fish in which females store sperm for several months and where stored sperm contribute significantly to a male's lifelong reproductive success. In this species, males respond to the perception of future mating opportunities by increasing the quantity (number) and quality (swimming velocity) of ready-to-use sperm (an anticipatory response called 'sperm priming'). Here we investigated 1) the effect of sperm priming on <i>in-vitro</i> sperm viability at stripping and its temporal decline (as estimate of sperm survival), and, 2) the <i>in-vitro</i> competitive fertilization success in relation to female sperm storage using artificial insemination. As expected, sperm-primed males produced more numerous and faster sperm, but with a reduced <i>in-vitro</i> sperm viability at stripping and after 4 hours, compared to their counterparts. Artificial insemination revealed that the small (non-significant) advantage of primed sperm when fertilization immediately follows insemination, is reversed when eggs are fertilized by female-stored sperm, weeks after insemination. By suggesting a plastic trade-off between sperm velocity and viability, these results demonstrate that prolonged female sperm storage generates divergent selection pressures on ejaculate phenotype.</p>
Data from: Study of regional differences in GC content values in chromosomes of the guppy and related fish species
<p><span><span><span><span><span><span><span><span><span><span><span>Genetic and physical mapping of the guppy (<i>P. reticulata</i>) have shown that recombination patterns differ greatly between males and females. Crossover events occur evenly across the chromosomes in females, but in male meiosis they are restricted to the tip furthest from the centromere of each chromosome, creating very high recombination rates per megabase, similar to the high rates in of pseudo-autosomal regions (PARs) of mammalian sex chromosomes. We here used the intronic GC content to indirectly infer the recombination patterns on guppy chromosomes. This is based on evidence that recombination is associated with GC-biased gene conversion, so that genome regions with high recombination rates should be detectable by high GC content. We used intron sequences and 3<sup>rd</sup> positions of codons, in order to make comparisons between sequences that are matched, as far as possible, with respect to selective constraints. Both these types of sites are likely to be under weak selection. Almost all guppy chromosomes, including the sex chromosome (LG12), prove to have very high GC values near their assembly ends, suggesting high recombination rates due to strong crossover localisation in male meiosis. Our test does not suggest that the guppy XY pair has stronger crossover localisation than the autosomes, or than the homologous chromosome in a closely related fish, the platyfish (<i>Xiphophorus maculatus</i>). We therefore conclude that the guppy XY pair has not recently undergone an evolutionary change to a different recombination pattern, or reduced its crossover rate, but that the guppy evolved Y-linkage due to acquiring a male-determining factor that also conferred the male crossover pattern. The results also identify the centromere ends of guppy chromosomes, which were not determined in the guppy genome assembly. </span></span></span></span></span></span></span></span></span></span></span></p>
Data from: Kin recognition in guppies uses self-referencing on olfactory cues
<p>Kin recognition plays an important role in social behavior and evolution, but the proximate mechanisms by which individuals recognize kin remain poorly understood. In many species, individuals form a "kin template" that they compare against conspecifics' phenotypes to assess phenotypic similarity–and by association, relatedness. Individuals may form a kin template through self-inspection (i.e. self-referencing) and/or by observing their rearing associates (i.e. family-referencing). However, despite much interest, few empirical studies have successfully disentangled self- and family-referencing. Here, we employ a novel set of breeding crosses using the Trinidadian guppy (<i>Poecilia reticulata</i>)<i> </i>to disentangle referencing systems by manipulating exposure to kin from conception onwards. We show that guppies discriminate among their full- and maternal half-siblings, which can only be explained by self-referencing. Additional behavioral experiments revealed no evidence that guppies incorporate the phenotypes of their broodmates or mother into the kin template. Finally, by manipulating the format of our behavioral tests, we show that olfactory communication is both necessary and sufficient for kin discrimination. These results provide robust evidence that individuals recognize kin by comparing the olfactory phenotypes of conspecifics against their own. This study resolves key questions about the proximate mechanisms underpinning kin recognition, with implications for the ontogeny and evolution of social behavior.</p>
The role of boundary length and adjacent patch contrast in guppy mate choice: Dataset, Matlab and R codes
<p>The presence of various combinations of adjacent colours within polymorphic species' colour pattern could have a major impact on mate choice. We studied the role of pattern geometry in predicting mate choice in guppies using boundary strength analysis (BSA). BSA estimates the visual contrast intensity between two adjacent colour patches (<i>ΔS</i>) weighted by the lengths of the boundaries between these adjacent colour patches. We measured both the chromatic (hue and saturation) and achromatic (luminance) <i>ΔS</i> for each pair of adjacent patches. For each male's colour pattern, we measured BSA as both mean (<i>mΔS</i>)<i> </i>and coefficient of variation (<i>cvΔS</i>) of all <i>ΔS</i> weighted by their corresponding boundary lengths. We also determined if specific colour patch boundaries had an impact on female preferences and whether these predicted overall male contrast (<i>mΔS</i>). We found that males with a higher <i>mΔS</i> were more attractive to females and that six boundaries containing either fuzzy black or black as one of the pair colours significantly affected female preferences, indicating that (1) females favoured highly conspicuous males and (2) melanin-based patches could be used as a signal amplifier, not only for orange but for other colours.</p>
Data from: Beauty in the eyes of the beholders: color vision is tuned to mate preference in the Trinidadian guppy (Poecilia reticulata)
A broad range of animals use visual signals to assess potential mates, and the theory of sensory exploitation suggests variation in visual systems drives mate preference variation due to sensory bias. Trinidadian guppies (Poecilia reticulata), a classic system for studies of the evolution of female mate choice, provide a unique opportunity to test this theory by looking for co-variation in visual tuning, light environment, and mate preferences. Female preference co-evolves with male coloration, such that guppy females from 'low predation' environments have stronger preferences for males with more orange/red coloration than do females from 'high predation' environments. Here we show that color vision also varies across populations, with 'low' predation guppies investing more of their color vision to detect red/orange coloration. In independently colonized watersheds, guppies expressed higher levels of both LWS-1 and LWS-3 (the most abundant LWS opsins) in 'low predation' populations than 'high predation' populations at a time that corresponds to differences in cone cell abundance. We also observed that the frequency of a coding polymorphism differed between high and low predation populations. Together this shows that the variation underlying preference could be explained by simple changes in expression and coding of opsins, providing important candidate genes to investigate the genetic basis of variation in this model system.
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International Brain Laboratory public data
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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.