Freshwater Crayfish 5(1): 43-55 (1983)
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Respiration and ionoregulation in the euryhaline crayfish Pacifastacus leniusculus on exposure to high salinity: an overview
Respiratory gas exchange, ventilation, heart rate and acid-base balance were studied in a freshwater euryhaline crayfish and correlated with osmo- and ionoregulation during 48h exposure in 25, 50 and 75% seawater. Despite increases in haemolymph ionic levels some degree of regulation was evident. Respiratory and cardiac frequency decreased in 25 and 50% seawater but were elevated in 75%. Concomitantly O2 uptake decreased as the medium approached isosmicity with the blood. Blood gas analysis demonstrated reductions in O2 tension and content but the a-vO2 content difference was maintained except in 50% SW. An acidosis was measured in 75% seawater which was partially offset by hyperventilatory alkalosis and may have been coupled with the decrease in blood ammonia. Evidence that haemocyanin acts as a source of free amino acids for elevation of osmolality will be presented. The opposing effects of pH and ionic concentrations on the respiratory pigment were assessed: in vivo analysis indicated an increase in 02 affinity but the existence of another dialysable cofactor was implicated in vitro. These changes resulted in reduced CO2 buffering capacity.
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Wheatly MG and McMahon BR. (1983). Respiration and ionoregulation in the euryhaline crayfish Pacifastacus leniusculus on exposure to high salinity: an overview. Freshwater Crayfish 5(1):43-55. doi: 10.5869/fc.1983.v5.043
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