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2 resultados encontrados para: AUTOR: Plath, Martin
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*En hemeroteca, SIBE-Chetumal
The offspring size fecundity trade off and female fitness in the Atlantic molly (Poecilia mexicana, Poeciliidae)
Riesch, Rüdiger (autor) ; Plath, Martin (autor) ; Schlupp, Ingo (autor) ;
Contenido en: Environmental Biology of Fishes Vol. 94, no. 2 (June 2012), p. 457-463 ISSN: 0378-1909
Bibliotecas: Chetumal
SIBE Chetumal
60523-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Chetumal
Resumen en: Inglés |
Resumen en inglés

Across a variety of taxa, large offspring have been demonstrated to have a fitness advantage over smaller offspring of the same species. However, producing large offspring often comes at the cost of having to produce fewer young, and the payoff (and thus, evolutionary outcome) of this trade-off is expected to vary between environments. Atlantic mollies (Poecilia mexicana: Poeciliidae, Teleostei), inhabiting a sulfidic cave and various non-sulfidic surface habitats in Tabasco (Mexico), are reproductively isolated and evolved divergent female lifehistory traits: females of the cave ecotype produce considerably fewer, but larger offspring. Stressful (sulfidic) environments may favor the production of larger offspring, as they are better able to cope with chemical stressors. It remains to be determined

though if increased offspring survival outweighs the fitness cost of producing fewer but larger offspring even under benign laboratory conditions. We tested 30-day newborn survival of offspring from wildcaught P. mexicana females from diverging populations in a low-density, no predation, no cannibalism, and ad-libitum-food, benign laboratory environment. Survival rates were highly skewed towards larger cave molly offspring; however, surface molly females still had a higher fitness than cave molly females in terms of higher total numbers of surviving offspring. Our study provides evidence for an innate fitness advantage of larger cave molly offspring. Furthermore, the observed differences in life-history strategies could promote further divergence and reproductive isolation among these ecotypes of P. mexicana, because cave molly females immigrating into the adjacent surface habitats would most likely be selected against.

*En hemeroteca, SIBE-Campeche
Predation on a cave fish by the freshwater crab Avotrichodactylus bidens (Bott, 1969) (Brachyura, Trichodactylidae) in a mexican sulfur cave
Klaus, Sebastian ; Plath, Martin (coaut.) ;
Contenido en: Crustaceana Vol. 84, no. 4 (2011), p. 411-418 ISSN: 0011-216X
Bibliotecas: Campeche
SIBE Campeche
54474-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Campeche
Resumen en: Inglés |
Resumen en inglés

Using prey-choice experiments, we demonstrate that the freshwater crab Avotrichodactylus bidens (Bott, 1969) preys on cave-dwelling fish (Poecilia mexicana Steindachner, 1863) in a sulfidic southern Mexican cave, the Cueva del Azufre, and thus may be one of the top predators in this subterranean ecosystem.