| Autor: |
John Gatz, A., Kennedy, Victor, Mihursky, Joseph |
| Zdroj: |
Chesapeake Science; 1973, Vol. 14 Issue 3, p171-180, 10p |
| Abstrakt: |
Pulsation rate of Chrysaora quinquecirrha medusae was inversely and linearly related to bell diameter over the natural temperature range (15-32 C) of this life history stage of the sea nettle in the upper Chesapeake Bay. At unnatural, elevated temperatures this relationship was disrupted. Pulsation rates generally increased with temperature increase from 15 C to 30 C and then decreased at higher temperatures. The rate-temperature curve for acclimated medusae was similar in shape (increase and decrease in pulsation rate with temperature change) to rate-temperature curves reported for warm water medusae; its shape was different from those reported for cold water medusae. Acclimation of pulsation rate to changed temperature was faster than acclimation of upper lethal temperature, although both were measured in hours. Upper lethal temperatures measured over 20-30 C were directly related to acclimation temperature and were similar to those reported for sea nettle polyps (34-35 C). Medusae were more sensitive than polyps to cold, with death occurring at 10 C. Thermal discharges into the upper Chesapeake Bay which raise water temperature above 30 C are probably stressful to sea nettle medusae. Temperatures above 38 C could be lethal in a few minutes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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