Campus Units

Zoology

Document Type

Article

Publication Version

Published Version

Publication Date

1996

Journal or Book Title

Transactions of the Illinois State Academy of Science

Volume

89

Issue

3-4

First Page

225

Last Page

231

Abstract

Many aquatic snails occupy ephemeral habitats that are occasionally subjected to severe environmental conditions. To investigate the physiological capacity of these animals to resist extreme environmental changes, we aerially exposed aquatic pond snails (Physella integra) to temperatures of 5°C and 20°C for 6, 8, 12, 24, 36, 48, and 60 hours. Survivorship varied with temperature and exposure times. At 20°C, survivorship was 0% for snails aerially exposed for 24 hours or longer. At 5°C, 0% survivorship was attained at 60 hours exposure. Sensitivity to aerial exposure was related to shell size of individuals, with larger specimens (shell length greater than 7 mm) significantly more likely to survive exposure than smaller specimens at temperatures and intervals with incomplete mortality. These results suggest that epiphragm development and size-specific survivorship predispose these animals to rapid population recovery following severe, short-term environmental fluctuations.

Comments

This article is from Transactions of the Illinois State Academy of Science 89 (1996): 225. Posted with permission.

Copyright Owner

Illinois State Academy of Science

Language

en

File Format

application/pdf

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