ACCLIMATION TO TEMPERATURE IN THE MARINE COPEPOD, CALANUS FINMARCHICUS (GUNNER.)

• Main Author: K. Hahow
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1963
• Subjects: Gunner; Calanus finmarchicus; Copepods
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.9938; http://www.aslo.org/lo/toc/vol_8/issue_1/0001.pdf

Acclimation of oxygen consumption to three experimental temperatures (4, 10, and 20°C) was studied in the pelagic copepod, Calanus finmarchicus ( Gunner.). Oxygen consumption, when corrected for dry weight differences, reached minimal levels at the three temperatures after the unfed animals had been kept in the laboratory for periods up to three days. Those maintained at 4°C achieved their lowest rate in the shortest time. ’ C&-shoot of oxygen uptake was demonstrated when copepods were exposed to sudden temperature change. Oxygen consumption fell to a steady rate 6-8 hr after an increase of \ 5°C. Acclimated curves of respiration with superimposed acutely determined curves were con-structed for Calanus collected in the spring and in the summer. From these curves it appears that the copepods do not acclimate to temperatures outside their seasonal tempera-ture range but are able to compensate for temperature changes in the vicinity of the temperature of the water from which they are collected.