Effects of temperature and water on critical oxygen tension of turtle embryos

Wiley - Tập 268 Số 1 - Trang 1-8 - 1994
Yeong‐Choy Kam1, Harvey B. Lillywhite1
1Department of Zoology, University of Florida, Gainesville, Florida, 32611

Tóm tắt

AbstractThe influences of temperature and water on the ability of turtle embryos to tolerate hypoxia were investigated by measuring critical oxygen tension, Pc, at different levels of temperature (22, 27, and 32°C) and hydric conditions (3 and 13% gravimetric water content). Eggs were half‐buried in sand with 3 or 13% gravimetric water content and incubated at a constant 30°C. Using a closed metabolic chamber, oxygen consumption, \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\rm V}\limits^{\rm .} $\end{document}, was measured at decreasing oxygen tensions. Embryonic \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\rm V}\limits^{\rm .} $\end{document} varied as a function of incubation day and temperature, whereas the Pc differed among temperatures but not among incubation days. At a given incubation day, the Pc increased in direct proportion to temperature. Eggs incubated in sand with 13% gravimetric water content achieved greater mass at days 30 and 39 than did those in sand with 3% gravimetric water content. However, \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\rm V}\limits^{\rm .} $\end{document}, Pc, and masses of yolk‐free hatchlings were similar in the two hydric conditions, indicating that hypoxic tolerance of turtle eggs is not curtailed by excessive water absorption. The similarity in Pc is likely attributable to the small \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\rm V}\limits^{\rm .} $\end{document}/surface area ratio of turtle eggs. Within the range of parameters studied, temperature, but not water, can modify the Pc of turtle embryos. © 1994 Wiley‐Liss, Inc.

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Wiley

Tập 268 Số 1

1-8

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