Effects of Constant and Fluctuating Temperatures on Reproductive Performance of a Desert Pupfish, Cyprinodon n. nevadensis

1 January 1977

journal article
Published by University of Chicago Press in Physiological Zoology

Vol. 50 (1) , 1-10
https://doi.org/10.1086/physzool.50.1.30155710

Abstract

Reproductive temperature tolerance tests were performed in the laboratory on an inbred stock of Amargosa pupfish, Cyprinodon n. nevadensis. Egg production was optimal at constant temperatures 24 through 32 C and at fluctuating temperatures 32-28 and 36-28 C. The reproductive tolerance range, defined as the range of optimal egg production with at least 50 percent hatchability, was 24 through 30 C, which is one-fifth of the range for normal activity and one-seventh of the critical thermal tolerance range. Temperature also affected the quality of eggs produced; temperature and yolk diameter were inversely related. The tolerance limits for oogenesis were narrower than the limits for successful hatching of healthy eggs exposed to temperature stress after spawning.

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