Journal Title
Title of Journal: J Comp Physiol B
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Abbravation: Journal of Comparative Physiology B
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Publisher
Springer-Verlag
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Authors: Daniel L Curtis Iain J McGaw
Publish Date: 2009/08/28
Volume: 180, Issue: 2, Pages: 189-198
Abstract
Respiratory responses and gastric processing were examined during hyposaline exposure in two crab species of differing osmoregulatory ability The efficient osmoregulator Callinectes sapidus displayed an immediate increase in oxygen uptake when exposed to low salinity in isolation In contrast the weak osmoregulator Cancer magister showed no change in oxygen uptake upon acute exposure 6 h but slight increases in oxygen uptake tended to occur over longer time scales 12–24 h These changes were likely attributable to an increase in avoidance activity after 6 h hyposaline exposure Following feeding in 100 SW oxygen uptake doubled for both species and remained elevated for 15 h When postprandial crabs were exposed to low salinities C sapidus were able to sum the demands of osmoregulation and digestion Thus gastric processes continued unabated in low salinity Conversely postprandial C magister prioritized responses to low salinity over those of digestion resulting in a decrease in oxygen uptake when exposed to low salinity This decrease in oxygen uptake corresponded to a reduction in the rate of contraction of the pyloric stomach and a subsequent doubling of gastric evacuation time The current study is one of the few to illustrate how summation or prioritization of competing physiological systems is manifested in digestive processes
Keywords:
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- Intestinal osmoregulatory acclimation and nitrogen metabolism in juveniles of the freshwater marble goby exposed to seawater
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