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Variation in metamorphic timing can be induced by variation in density without differences in growth rate in the frog, Rana utricularia.(Collegiate Communications--Undergraduate)

Publication: Proceedings of the North Dakota Academy of Science
Publication Date: 01-APR-05
Format: Online
Delivery: Immediate Online Access

Article Excerpt
The standard model for understanding the timing of amphibian metamorphosis provided by Wilbur and Collins predicts that a growing larva will delay metamorphosis in order to take advantage of a good growth opportunity; if a larval habitat deteriorates (e.g., arrival of predators, pond then a...

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...desiccation), reduction in growth rate should be tranduced to an endocrinological response, i.e., the initiation of metamorphosis (1). While this optimality model can provide an intuitive understanding of when metamorphosis can occur, there appears to be little empirical support for it. Most field studies use...

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