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Comparative Respiratory Physiology and Ecology of Phyllopod Crustacea. III. Notostraca 1* )

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[The relations among sex, body size, dissolved O2, temperature and the metabolic rate of the notostracan, Lepidurus lemmoni, were studied. Salinity tolerance was also determined. Finally, comparisons are made between the three phyllopods considered. L. lemmoni demonstrates a regression of O2 uptake on weight of 0.68 suggesting VO2 is related to surface area. Animals of similar weight demonstrated no significant effect of sex on V O2. VO2 was reasonably regulated to a critical point of 1.2-1.3 cm3 O2/1. Both sexes show considerable temperature sensitivity over a range of 3-28° C (Q10's vary between 2.1 and 5.1). Above 28° C, VO2 drops sharply and no animals could be acclimated to 35° C. The success of Lepidurus in temporary ponds with wide diurnal temperature changes is not due to an insensitivity to fluctuations in water temperature. Percentage survival after 48 hours was greatest between 3.5 and 7.0 ppt SW, suggesting that Lepidurus is able to tolerate only a narrow salinity range., The relations among sex, body size, dissolved O2, temperature and the metabolic rate of the notostracan, Lepidurus lemmoni, were studied. Salinity tolerance was also determined. Finally, comparisons are made between the three phyllopods considered. L. lemmoni demonstrates a regression of O2 uptake on weight of 0.68 suggesting VO2 is related to surface area. Animals of similar weight demonstrated no significant effect of sex on V O2. VO2 was reasonably regulated to a critical point of 1.2-1.3 cm3 O2/1. Both sexes show considerable temperature sensitivity over a range of 3-28° C (Q10's vary between 2.1 and 5.1). Above 28° C, VO2 drops sharply and no animals could be acclimated to 35° C. The success of Lepidurus in temporary ponds with wide diurnal temperature changes is not due to an insensitivity to fluctuations in water temperature. Percentage survival after 48 hours was greatest between 3.5 and 7.0 ppt SW, suggesting that Lepidurus is able to tolerate only a narrow salinity range.]

Affiliations: 1: Joint Science Department, The Claremont Colleges, Claremont, Ca., U.S.A.; 2: Biological Sciences, California Polytechnic State University, San Luis Obispo, Ca., U.S.A.

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