The adaptive significance of an environmentally-cued developmental switch in an anuran tadpole

@article{Pfennig2004TheAS,
  title={The adaptive significance of an environmentally-cued developmental switch in an anuran tadpole},
  author={David W. Pfennig},
  journal={Oecologia},
  year={2004},
  volume={85},
  pages={101-107}
}
  • D. Pfennig
  • Published 1 November 1990
  • Biology, Environmental Science
  • Oecologia
SummaryThis study investigated the proximate basis of bimodally-distributed, environmentally-induced variation that occurs in natural populations of spade-foot toad tadpoles (Scaphiopus multiplicatus). Most individuals in most populations occur as a small, slowly-developing omnivore morph. In some of these same populations, a varying number of individuals occur as a large, rapidly-developing carnivore morph (Pfennig 1989). Censuses of 37 different natural ponds revealed that the frequency of… 

Growth and foraging consequences of facultative paedomorphosis in the tiger salamander,Ambystoma tigrinum nebulosum

Students of a montane population of the tiger salamander studied the adult growth rate and body condition across three growing seasons to assess the relative costs and benefits of each morph, suggesting that paedomorphs should have decreased fitness relative to metamorphs.

Adaptive value of a predatory mouth-form in a dimorphic nematode

This study provides the first functional context for dimorphism in a model for the genetics of plasticity and shows that the complex Eu form confers a greater ability to kill prey than the more rapidly developing St form.

Developmental mechanisms of threshold evolution in a polyphenic beetle

Larval larvae of populations that have evolved a larger threshold body size have to accumulate greater mass to become competent to express the horned morph, are less sensitive to the juvenile hormone (JH) analogue methoprene, and exhibit a delay in the sensitive period for meethoprene relative to other developmental events.

Reassessment of the environmental model of developmental polyphenism in spadefoot toad tadpoles

The results indicate that carnivore induction can occur through different cues and that the current model for carnivore development is too limited, and argue that the carnivore/omnivore spadefoot system is neither a polyphenism nor a polymorphism but is a continuously distributed plasticity.

Evolutionary and developmental considerations of the diet and gut morphology in ceratophryid tadpoles (Anura)

The larval development of the gastrointestinal tract of Lepidobatrachus is unique compared with that of other free-living anuran larvae, and patterns seem to be influenced by food quantity/quality, and most predominant by animal protein.

A TADPOLE‐INDUCED POLYPHENISM IN THE SALAMANDER HYNOBIUS RETARDATUS

  • H. MichimaeM. Wakahara
  • Environmental Science, Biology
    Evolution; international journal of organic evolution
  • 2002
The results do not support the hypotheses that the broad‐headed morph evolved for consuming conspecifics because of their better balance of nutrients or for excluding strong competitors for food or space, and it is tentatively concluded that the morph evolved to eat large, tough prey, including both conspecies and heterospecific tadpoles.

Morphological variation in a larval salamander: dietary induction of plasticity in head shape

The results illustrate that ingestion of different types of prey contributes to plasticity in head shape, but that some other proximate cue(s), either alone or in combination with diet variation, is essential to induce the extremes of trophic polymorphism in this species.

Dead Spadefoot Tadpoles Adaptively Modify Development in Future Generations: A Novel Form of Nongenetic Inheritance?

A possible novel form of nongenetic inheritance in the tadpoles of the Mexican Spadefoot is described: the transmission of information about the environment from dead individuals to living individuals of a later cohort or generation to mediate adaptive evolution when populations experience different environmental conditions.

Threshold evolution in exotic populations of a polyphenic beetle

The phenotypic divergence observed between field populations was maintained in laboratory populations after two generations under identical environmental conditions, suggesting a genetic basis to allometric divergence in these populations.

Antipredator behavior promotes diversification of feeding strategies.

It is hypothesized that the recurrent expression of such behaviors in sympatric populations of Sc.
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