Body size and allometric shape variation in the molly Poecilia vivipara along a gradient of salinity and predation

BMC Evolutionary Biology

Ana C Petry¹  Maria Julia C Magazoni²  S Ivan Perez³  Márcio S Araújo² 

[1] Núcleo em Ecologia e Desenvolvimento Socioambiental de Macaé – NUPEM, Universidade Federal do Rio de Janeiro – UFRJ, Macaé, RJ, Brazil;Departamento de Ecologia, Universidade Estadual Paulista, Rio Claro, SP, Brazil;División Antropología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, CONICET, La Plata, Argentina

关键词: Poeciliidae;    Morphometrics;    Hoplias malabaricus;    Ecological gradients;    Divergent natural selection;   

Others  :  1121779
DOI  :  10.1186/s12862-014-0251-7

 received in 2014-10-21, accepted in 2014-11-20,  发布年份 2014

【 摘 要 】

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.

Results

We 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.

Conclusions

Our 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.

【 授权许可】

   
2014 Araújo et al.; licensee BioMed Central Ltd.

【 图 表 】

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