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F. Ferrari, M. Dojiri (1987)
THE CALANOID COPEPOD EUCHAETA ANTARCTICA FROM SOUTHERN OCEAN ATLANTIC SECTOR MIDWATER TRAWLS, WITH OBSERVATIONS ON SPERMATOPHORE DIMORPHISMJournal of Crustacean Biology, 7
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and The basic mechanisms of crustacean res- piration, ventilation, and cardiovascular function have been the subjects of extensive investigation for more than a decade, es- pecially among the decapods (for review, see Taylor, 1982; Cameron and Mangum, 1983; McMahon and Wilkens, 1983; McMahon, 1988). The picture that has emerged is one of a common mechanism that displays a graded pattern of responses to varying en- vironmental conditions. One of the most commonly studied environmental variables has been low oxygen tensions. In response to declining oxygen tensions, decapods show one of two general patterns: (1) animals exhibiting oxy-independent res- piration, maintaining normal rates of oxy- gen uptake (M02), or (2) animals exhibiting oxy-dependent respiration, in which 1VI02 declines with ambient oxygen tension (Mangum and Van Winkle, 1973). These two patterns have also been termed oxyreg- ulation and oxyconformity, respectively (Taylor, 1982). Most decapods display some degree of oxy-independent respiration with MO2 being maintained by a combination of hyperventilation and increased stroke vol- ume of the heart. This preserves both the P02 gradient across the gills and hemo- lymph P02 until ambient oxygen tensions reach a critical low value (Mangum and Van Winkle, 1973; Taylor, 1976, 1982; Mc- Mahon and
Journal of Crustacean Biology – Brill
Published: Jan 1, 1990
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