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8 results for “Poecilia vivipara”
Data from: Body size and allometric shape variation in the molly Poecilia vivipara along a gradient of salinity and predation
Background: Phenotypic diversity among populations may result from divergent natural selection acting directly on traits or via correlated responses to changes in other traits. One of the most frequent patterns of correlated response is the proportional change in the dimensions of anatomical traits associated with changes in growth or absolute size, known as allometry. Livebearing fishes subject to predation gradients have been shown to repeatedly evolve larger caudal peduncles and smaller cranial regions under high predation regimes. Poecilia vivipara is a livebearing fish commonly found in coastal lagoons in the north of the state of Rio de Janeiro, Brazil. Similar to what is observed in other predation gradients, lagoons inhabited by P. vivipara vary in the presence of piscivorous fishes; contrary to other poeciliid systems, populations of P. vivipara vary greatly in body size, which opens the possibility of strong allometric effects on shape variation. Here we investigated body shape diversification among six populations of P. vivipara along a predation gradient and its relationship with allometric trajectories within and among populations.ResultsWe found substantial body size variation and correlated shape changes among populations. Multivariate regression analysis showed that size variation among populations accounted for 66% of shape variation in females and 38% in males, suggesting that size is the most important dimension underlying shape variation among populations of P. vivipara in this system. Changes in the relative sizes of the caudal peduncle and cranial regions were only partly in line with predictions from divergent natural selection associated with predation regime.ConclusionsOur results suggest the possibility that adaptive shape variation among populations has been partly constrained by allometry in P. vivipara. Processes governing body size changes are therefore important in the diversification of this species. We conclude that in species characterized by substantial among-population differences in body size, ignoring allometric effects when investigating divergent natural selection?s role in phenotypic diversification might not be warranted.
Data from: Body size and allometric shape variation in the molly Poecilia vivipara along a gradient of salinity and predation
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Figure 3 from: Berbel-Filho WM, Barros-Neto LF, Dias RM, Mendes LF, Figueiredo CAA, Torres RA, Lima SMQ (2018) Poecilia vivipara Bloch & Schneider, 1801 (Cyprinodontiformes, Poeciliidae), a guppy in an oceanic archipelago: from where did it come? ZooKeys 746: 91-104. https://doi.org/10.3897/zookeys.746.20960
Figure 3 Map with the sampling sites of individuals used on genetic analyses. Circles represent sampled sites. Squares represent sequences retrieved from GenBank. An asterisk represents the type locality of Poecilia vivipara. Different colours represent different phylogenetic clades. Sampling sites: 1 Margarita island 2 Maceió 3 Jaguaribe 4 Piranhas-Açu 5 Potengi 6 Paraíba do Norte 7 Ipojuca 8 São Francisco 9 Piauí 10 São João 11 Paraná.
Figure 2 from: Berbel-Filho WM, Barros-Neto LF, Dias RM, Mendes LF, Figueiredo CAA, Torres RA, Lima SMQ (2018) Poecilia vivipara Bloch & Schneider, 1801 (Cyprinodontiformes, Poeciliidae), a guppy in an oceanic archipelago: from where did it come? ZooKeys 746: 91-104. https://doi.org/10.3897/zookeys.746.20960
Figure 2 Sampling site of Poecilia vivipara in the border of the mangrove at Maceió River microbasin, Fernando de Noronha Archipelago, Pernambuco, Brazil.
Figure 1 from: Berbel-Filho WM, Barros-Neto LF, Dias RM, Mendes LF, Figueiredo CAA, Torres RA, Lima SMQ (2018) Poecilia vivipara Bloch & Schneider, 1801 (Cyprinodontiformes, Poeciliidae), a guppy in an oceanic archipelago: from where did it come? ZooKeys 746: 91-104. https://doi.org/10.3897/zookeys.746.20960
Figure 1 Live male of Poecilia vivipara, UFRN 0225, 25.2 mm SL. Maceió River microbasin, Fernando de Noronha Archipelago, Pernambuco, Brazil.
Figure 5 from: Berbel-Filho WM, Barros-Neto LF, Dias RM, Mendes LF, Figueiredo CAA, Torres RA, Lima SMQ (2018) Poecilia vivipara Bloch & Schneider, 1801 (Cyprinodontiformes, Poeciliidae), a guppy in an oceanic archipelago: from where did it come? ZooKeys 746: 91-104. https://doi.org/10.3897/zookeys.746.20960
Figure 5 Haplotype network showing intraspecific relationships among Poecilia vivipara haplotypes. Empty circles represent non-sampled haplotypes. Thin bars on branches represent mutational steps.
Figure 4 from: Berbel-Filho WM, Barros-Neto LF, Dias RM, Mendes LF, Figueiredo CAA, Torres RA, Lima SMQ (2018) Poecilia vivipara Bloch & Schneider, 1801 (Cyprinodontiformes, Poeciliidae), a guppy in an oceanic archipelago: from where did it come? ZooKeys 746: 91-104. https://doi.org/10.3897/zookeys.746.20960
Figure 4 Rooted Bayesian phylogenetic reconstruction tree of Cytochrome Oxidase I mitochondrial gene of Poecilia vivipara. Number in nodes represents the value of posterior probability.
FIGURE 30. Poecilia vivipara, ROM 61654, 42 in Annotated list and key to the stream fishes of Trinidad & Tobago
FIGURE 30. Poecilia vivipara, ROM 61654, 42 mm SL, Cocorite Swamp, Trinidad.
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