Journal ArticleDOI
Adult recruitment in chorus frogs: effects of size and date at metamorphosis'
TLDR
Unless breeding during the Ist yr led to higher mortality of large individuals, survival rate after meetamorphosis was not related to size or date at metamorphosis.Abstract:
A cohort of tadpoles of the chorus frog, Pseudacris triseriata, on Isle Royale, Michigan, was marked to determine the effect of body size and date at metamorphosis on survivorship to maturity. The cohort was classified at metamorphosis into four categories based on size and date of metamorphosis: large-early, small-early, large-late, and small- late. The number of frogs in each category that returned to breed on the study area was monitored for the following 2 yr. Long larval period and small body size at metamorphosis influenced recruitment to the breeding population by delaying maturity. Frogs that meta- morphosed at large size maintained their size advantage at maturity. Large body size and early date at metamorphosis increased survivorship to maturity by enhancing the chance that reproductive size was attained within 1 yr of metamorphosis. Frogs that were recap- tured in the 2nd yr after metamorphosis, when all frogs had attained mature size, were from all four categories in the same proportions marked at metamorphosis, indicating that unless breeding during the Ist yr led to higher mortality of large individuals, survival rate after metamorphosis was not related to size or date at metamorphosis.read more
Citations
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Pesticide mixtures, endocrine disruption, and amphibian declines: are we underestimating the impact?
Tyrone B. Hayes,Paola Case,Sarah Chui,Duc Chung,Cathryn Haeffele,Kelly Haston,Melissa Lee,Vien Phoung Mai,Youssra Marjuoa,John E. Parker,Mable Tsui +10 more
TL;DR: Estimating ecological risk and the impact of pesticides on amphibians using studies that examine only single pesticides at high concentrations may lead to gross underestimations of the role of pesticides in amphibian declines.
Journal ArticleDOI
Size and Timing of Metamorphosis in Complex Life Cycles: Time Constraints and Variation
Locke Rowe,Donald Ludwig +1 more
TL;DR: This work extends earlier theory to include explicit time constraints in three, hypothetical, complex life cycles to lead to optimal sizes for niche shifts that vary with time.
Journal ArticleDOI
Patterns of natural selection on size at metamorphosis in water frogs.
Res Altwegg,Heinz-Ulrich Reyer +1 more
TL;DR: Simple relationships between larval growth and postmetamorphic fitness components, and support for this frequently made assumption about size at metamorphosis are found are found.
Journal ArticleDOI
Predator-induced phenotypic plasticity in organisms with complex life histories
TL;DR: Predator-induced plasticity in metamorphic traits may be related to predator-induced changes in larval morphology and behavior, and future work should incorporate more detailed studies of growth rate, morphology, and behavior during the larval period.
Journal ArticleDOI
Adaptive Plasticity in Amphibian Metamorphosis
TL;DR: The diversity of behavioral, physiological, and life history traits exhibited within the Amphibia, as well as their experimental tractability, makes this group excellent for ecological and evolutionary studies.
References
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Journal Article
A simplified table for staging anuran embryos and larvae with notes on identification
TL;DR: A simplified table adequate for staging "generalized" developmental series will be presented, which is original only to the extent that it is a simplification of those already in existence.
Journal ArticleDOI
Ecological Aspects of Amphibian Metamorphosis: Nonnormal distributions of competitive ability reflect selection for facultative metamorphosis.
Henry M. Wilbur,James P. Collins +1 more
TL;DR: It is proposed that as development proceeds, variation in exponential growth coefficients causes a trend from a normal distribution to a skewed distribution of body sizes, and the relation between the ecological model and the physiological mechanisms that initiate metamorphosis can only be suggested.