The Effect of Water Temperature and Dissolved Oxygen Content on the Rate of Gill Movement of the Hellgrammite Corydalus Cornutus
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Citation:The Ohio Journal of Science. v65 n3 (May, 1965), 137-141
The rate of gill movement of the Hellgrammite Corydalus cornutus as a function of water temperature and dissolved oxygen content has been measured. The specimens were introduced into open, water-filled vessels subsequent to partial removal of dissolved oxygen from the water. Measurements of gill-movement rate were made with a hand tally counter and electric timer, while dissolved oxygen content determinations were accomplished by the Winkler technique. Gill movements increased 0.026±0.018 beats per second with each parts per million decrease in dissolved oxygen content. Gill movements increased 0.188±0.081 beats per second with each degree Centigrade increase in temperature. This latter value is consistent with van't Hoff's rule. Observations of the specimens showed that there was a strict sequence to gill movement and that, under certain conditions, bubbles formed at the presumably inoperative spiracles. Dissections were performed to investigate the cause of this bubble formation and gas was found to fill the major portion of the closed tracheal system.
Author Institution: Department of Zoology and Entomology, The Ohio State University, Columbus, Ohio 43210
Rights:Reproduction of articles for non-commercial educational or research use granted without request if credit to The Ohio State University and The Ohio Academy of Science is given.
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