Effects of temperature-induced variation in anuran larval growth rate on head width and leg length at metamorphosis.

Abstract:

:We tested whether temperature-induced variation in the growth rate of Rana cascadae tadpoles caused any variation in head width or leg length at metamorphosis, independent of the effects of temperature on body size. Body-size-adjusted head width appears to be insensitive to even large variations in tadpole growth rate. This result mirrors previous observations on the effects of variation in food level and temperature on metric shape in frogs and other ectothermic vertebrates. Leg length, on the other hand, showed a small but statistically significant response to the temperature treatment. Fast-growing tadpoles attained slightly longer legs than slowly growing tadpoles at a common metamorphic body size. This example is the first to show that variation in growth rate per se can influence metric shape (i.e., the rate at which individuals reach a common body size determines their shape at that size). Nevertheless, the induced effects were small, and our results taken together with those of previous studies suggest that environmentally induced variation in growth rate is not a major source of variation in metric shape of skeletal characters in ectothermic vertebrates.

journal_name

Oecologia

journal_title

Oecologia

authors

Blouin MS,Brown ST

doi

10.1007/s004420000458

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

358-361

issue

3

eissn

0029-8549

issn

1432-1939

pii

10.1007/s004420000458

journal_volume

125

pub_type

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