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Comparative Respiratory Physiology and Ecology of Phyllopod Crustacea. Ii. Anostraca 1 )

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[The relations between sex, body size, dissolved O2, temperature and the oxygen consumption of the anostracan, Branchinecta mackini, from different habitats and different seasons were studied. Salinity tolerance was also determined. A regression of V O2 on weight of 0.65 suggests V O2 is related to surface area. Male and female VO2's did not differ if the animals were the same weight. Respiratory responses of the three populations to decreased D.O. were similar except that critical points differed in direct correlation with the minimum levels of oxygen in the habitat, suggesting acclimatization. Thermal acclimatization to different pond conditions had no significant effect at temperatures less than 13° C but marked differences between populations did appear over the remainder of the experimental range. Sag pond animals have significantly lower V O2 at 20° perhaps demonstrating temperature acclimatization is attained by shifting or rotating the RT curve to the right. In contrast to May individuals, June Alkali Lake animals had significantly higher VO2 only above 26-27° and could survive 35°, suggesting acclimatization is attained by reaching a critical temperature later along a line of otherwise similar response. B. mackini shows normal temperature sensitivity with averaged Q10's of about 2.2 over most of the temperature range tested. Among Anostraca, B. mackini should be considered eurythermal. Survival data suggest that B. mackini is relatively tolerant of transfer to either hypo- or hyper-osmotic media., The relations between sex, body size, dissolved O2, temperature and the oxygen consumption of the anostracan, Branchinecta mackini, from different habitats and different seasons were studied. Salinity tolerance was also determined. A regression of V O2 on weight of 0.65 suggests V O2 is related to surface area. Male and female VO2's did not differ if the animals were the same weight. Respiratory responses of the three populations to decreased D.O. were similar except that critical points differed in direct correlation with the minimum levels of oxygen in the habitat, suggesting acclimatization. Thermal acclimatization to different pond conditions had no significant effect at temperatures less than 13° C but marked differences between populations did appear over the remainder of the experimental range. Sag pond animals have significantly lower V O2 at 20° perhaps demonstrating temperature acclimatization is attained by shifting or rotating the RT curve to the right. In contrast to May individuals, June Alkali Lake animals had significantly higher VO2 only above 26-27° and could survive 35°, suggesting acclimatization is attained by reaching a critical temperature later along a line of otherwise similar response. B. mackini shows normal temperature sensitivity with averaged Q10's of about 2.2 over most of the temperature range tested. Among Anostraca, B. mackini should be considered eurythermal. Survival data suggest that B. mackini is relatively tolerant of transfer to either hypo- or hyper-osmotic media.]

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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