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Document Type

Research

Abstract

During the summers of 1961, 1962, and 1963, mass emigrations of Rana pipiens pipiens Schreber occurred at the end of the first week in July. The intensity of the movement varied in the three years. Environmental causes for this movement were considered; temperature changes, precipitation or crowding do not seem to be operating. Samples of the tadpole populations were examined and the metamorphic changes prior to emigration are rapid and regular. With final metamorphosis into juvenile frogs, the emigration suddenly begins. It appears to be triggered by internal events related to maturation.

Publication Date

1964

Journal Title

Proceedings of the Iowa Academy of Science

Volume

71

Issue

1

First Page

511

Last Page

518

Copyright

© Copyright 1964 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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