Abstract
Eucidaris tribuloides is eurythermal and able to withstand acute exposure to a temperature range of 10 to 30°C. However, if these extremes persist, significant mortality results. Eucidaris tribuloides shows the ability to adjust righting activity, rates of feeding and fecal production, absorption efficiencies, and gut passage times to high temperature (30°C) during a two month exposure. Spermatogenesis is inhibited at this temperature. Individuals exposed to prolonged low temperature (10°C) remain inactive and do not survive past 30 days. Exposure to 18°C for a seven month period causes decreased rates of feeding and fecal production, low growth and delayed gametic development, as compared to exposure to 27°C. The acclimatory response exhibited by E. tribuloides to changes in temperature can best be described as partial acclimation.
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