| geographic and seasonal variation in alkaloid-based chemical defenses of dendrobates pumilio from bocas del toro, panama. | poison frogs contain an alkaloid-based chemical defense that is derived from a diet of certain alkaloid-containing arthropods, which include mites, ants, beetles, and millipedes. variation in population-level alkaloid profiles among species has been documented, and more than 800 different alkaloids have been identified. in the present study, we examine individual alkaloid variation in the dendrobatid poison frog dendrobates pumilio among seven populations and between two seasons on isla bastimen ... | 2006 | 16718571 |
| non-gradual variation in colour morphs of the strawberry poison frog dendrobates pumilio: genetic and geographical isolation suggest a role for selection in maintaining polymorphism. | the relative roles that geographical isolation and selection play in driving population divergence remain one of the central questions in evolutionary biology. we approached this question by investigating genetic and morphological variation among populations of the strawberry poison frog, dendrobates pumilio, in the bocas del toro archipelago, panama. we found significant population genetic structure and isolation by distance based on amplified fragment length polymorphism markers. snout vent le ... | 2007 | 17868297 |
| sex-related differences in alkaloid chemical defenses of the dendrobatid frog oophaga pumilio from cayo nancy, bocas del toro, panama. | poison frogs contain an alkaloid-based chemical defense that is sequestered directly from a diet of alkaloid-containing arthropods. geographic and temporal variation in alkaloid defense is common in poison frogs and is generally attributed to differences in the availability of alkaloid-containing arthropods. variable chemical defense in poison frogs may have important consequences for predator-prey interactions, requiring a full understanding of the factors involved in explaining such variation. ... | 2010 | 20030363 |
| intraspecific reproductive character displacement in a polymorphic poison dart frog, dendrobates pumilio. | divergence in male mating signals and associated female preferences is often an important step in the process of speciation. reproductive character displacement, the pattern of greater divergence of male signals and/or female preference in sympatry than in allopatry, has been observed in a variety of taxa with different degrees of postzygotic isolation. a number of selective processes, including reinforcement, have been proposed to cause such a pattern. cases in which reproductive character disp ... | 2011 | 20825478 |
| sexual dimorphism and directional sexual selection on aposematic signals in a poison frog. | it is commonly assumed that natural selection imposed by predators is the prevailing force driving the evolution of aposematic traits. here, we demonstrate that aposematic signals are shaped by sexual selection as well. we evaluated sexual selection for coloration brightness in populations of the poison frog oophaga [dendrobates] pumilio in panama's bocas del toro archipelago. we assessed female preferences for brighter males by manipulating the perceived brightness of spectrally matched males i ... | 2009 | 19858491 |