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A Morphological and Ecological Comparison of Two Populations of the Tailed Frog, Ascaphus truei Stejneger
Dean E. Metter
Vol. 1964, No. 1 (Mar. 26, 1964), pp. 181-195
Stable URL: http://www.jstor.org/stable/1440849
Page Count: 15
You can always find the topics here!Topics: Larvae, Creeks, Female animals, Animals, Tadpoles, Ova, Insect larvae, Vegetation, Population ecology, Larval development
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Two populations of Ascaphus truei from northern Idaho and southeastern Washington show numerous differences in body proportions and conform poorly with named subspecies. The coloration and pattern of adults and tadpoles from the two areas are distinctive. The life history is similar in the two areas, but differs from that described for populations on the Olympic Peninsula. Breeding occurs in early fall. Male secondary sexual characteristics are highly developed only during the breeding season. The egg-laying season extends from late June to early August; sperm are evidently retained by the female from breeding the previous fall. Eggs hatch in August and September. Larvae possess hind legs at the age of two years, but transformation is not completed until 3 years after hatching. The distribution of Ascaphus is restricted in the two areas but shows no apparent correlation with changes in habitat or predators.