Tester, P.A. (1982). The effects of the temperature acclimation of parental generations and incubation temperature on lability of egg hatching time in the copepod Acartia tonsa Dana. Ph.D. Dissertation, Oregon State University, Corvallis, Oregon, U.S.A. 53 pp.

117010

Tester, P.A.

1982

53 pp.

Publication

Available in Wilson Copepod Library (non-digital)

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Experimental results indicate that both parental acclimation temperature and egg incubation temperature have significant effects on the egg hatching time of Acartia tonsa between the temperatures of 15°C and 25°C. The effects of parental acclimation temperature and egg incubation temperature are additive if the long-term parental acclimation temperature is constant. A. tonsa eggs are labile to temperature during development and after they are laid up to the time of hatching. Egg hatching times acclimate to changes in parental culture temperatures from 2 C and 25°C within 86 hours and to teperature changes from 15°C withiTh 8 days. Hatching times of eggs From field collected A. tonsa demonstrate that acclimation of hatching times occurs in the field and responds to time periods of less than one generation. Results from feeding studies using 14C labeled algae indicate that eggs are labeled within 24 hours and that the 0 activity is reduced t.o a base level 48 hours after substitution of unlabeled food. The lability of A. tonsa eggs to temperature and the acclimation of egg hatching times to temperature changes suggests that any predictions of egg hatching times for this species should be accompanied by a statement of the environmental conditions under which the values are determined and any population parameters based on birth rates for this species should be calculated carefully from emprically derived data using acclimated artimals.

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