Foraging tactics in alternative heterochronic salamander morphs: trophic quality of ponds matters more than water permanency
نویسندگان
چکیده
MATHIEU DENOEL* , § , HOWARD H. WHITEMAN †, § AND SCOTT A. WISSINGER ‡, § *Laboratory of Fish and Amphibian Ethology, Behavioural Biology Unit, Department of Environmental Sciences, University of Liège, Liège, Belgium Department of Biological Sciences, Murray State University, Murray, KY, U.S.A. Biology Department, Allegheny College, Meadville, PA, U.S.A. Rocky Mountain Biological Laboratory, Crested Butte, CO, U.S.A.
منابع مشابه
Temporal shift of diet in alternative cannibalistic morphs of the tiger salamander
Evolutionary theory predicts that alternative trophic morphologies are adaptive because they allow a broad use of resources in heterogeneous environments. The development of a cannibal morphology is expected to result in cannibalism and high individual fitness, but conflicting results show that the situation is more complex. The goal of the present study was to increase our understanding of the...
متن کاملFeeding Performance in Heterochronic Alpine Newts is Consistent with Trophic Niche and Maintenance of Polymorphism
The feeding performances of two heterochronic morphs of the Alpine newt Triturus alpestris were investigated in laboratory experiments. Although both morphs are able to feed in the aquatic habitat, the hydrodynamics of prey capture differ between morphs. In paedomorphs water sucked with prey is expelled behind the mouth through gill bars. In metamorphs, water is expelled by the mouth as gill sl...
متن کاملTrophic niche divergence among colour morphs that exhibit alternative mating tactics.
Discrete colour morphs associated with alternative mating tactics are assumed to be ecologically equivalent. Yet suites of behaviours linked with reproduction can also favour habitat segregation and exploitation of different prey among morphs. By contrast, trophic polymorphisms are usually attributed to morphs exhibiting habitat or prey selectivity. An alternative hypothesis is that habitat var...
متن کاملCorrelated evolution of phenotypic plasticity in metamorphic timing.
Phenotypic plasticity has long been a focus of research, but the mechanisms of its evolution remain controversial. Many amphibian species exhibit a similar plastic response in metamorphic timing in response to multiple environmental factors; therefore, more than one environmental factor has likely influenced the evolution of plasticity. However, it is unclear whether the plastic responses to di...
متن کاملMarine trophic diversity in an anadromous fish is linked to its life-history variation in fresh water.
We used carbon and nitrogen stable isotopes from muscle tissues accrued in the ocean to examine whether marine foraging tactics in anadromous sockeye salmon (Oncorhynchus nerka) are linked to their ultimate freshwater life history as adults. Adults from large-bodied populations spawning in deep freshwater habitats had more enriched δ(15)N than individuals from small-bodied populations from shal...
متن کامل