The Response of the Corbiculidae (Mollusca: Bivalvia) to Osmotic Stress: The Organismal Response
- 1 January 1978
- journal article
- research article
- Published by University of Chicago Press in Physiological Zoology
- Vol. 51 (1) , 68-78
- https://doi.org/10.1086/physzool.51.1.30158666
Abstract
There was no difference in the pattern of valve movements when Polymesoda was transferred from 10‰ to fresh water and vice versa. Transfer from 5‰ to fresh water had no effect on valve movements in Corbicula, but a transfer from fresh water to 5‰ depressed activity. When Polymesoda was transferred from fresh water to 10‰, the osmotic pressure of the blood increased exponentially toward an asymptote with a half time of 2.61 h; upon transfer from 10‰ to fresh water, the osmotic pressure decreased exponentially toward an asymptote with a half time of 4.25 h. In Corbicula, the half time for hyperosmotic stress (fresh water to 5‰) was 2.56 h while that for hypoosmotic stress (5‰ to fresh water) was 2.30 h. In Polymesoda, volume regulation in response to hypoosmotic stress (10‰ to fresh water) was complete in 6 h; volume regulation in response to hyperosmotic stress (fresh water to 10‰) was complete in 36 h. In Corbicula, volume regulation in response to hypoosmotic stress (5‰ to fresh water) was, as in Polymesoda, complete in 6 h; volume regulation in response to hyperosmotic stress (fresh water to 5‰) was incomplete.This publication has 0 references indexed in Scilit: