Title
Effect of oxygen and salt on haemolymph oxygen binding in the brine shrimp Artemia franciscana Effect of oxygen and salt on haemolymph oxygen binding in the brine shrimp Artemia franciscana
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Berlin ,
Subject
Biology
Source (journal)
Marine biology
Marine biology. - Berlin
Volume/pages
118(1994) :2 , p. 263-269
ISSN
0025-3162
ISI
A1994MY34200011
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The oxygen-binding properties of haemolymph from laboratory-reared Artemia franciscana were investigated in vitro. Adult female brine shrimp without eggs were acclimated to seven different combinations of salinity and oxygen. The oxygen affinity (P-50) of unprocessed haemolymph rises with acclimation oxygen partial pressure (PO2) up to normoxic values, after which no influence of oxygen occurs. The increase in P-50 with acclimation PO2 can be explained by the change in proportion of each of three different haemoglobins in the haemolymph. Salinity acclimation has no effect on haemolymph P-50. The effects of the different major salts [NaNO3, NaCl, Ca(NO3)(2), Mg(NO3)(2)], pH, and the metal-binding ligand EGTA on the oxygen-binding properties of buffered haemolymph (of shrimp acclimated to 10 parts per thousand salinity) were also studied. Little or no effect of these salts could be found. A small Bohr effect (pH 6.5 to 9.1, phi = - 0.11) was noted. Addition of EGTA caused a significant decrease of the oxygen affinity at concentrations up to 50 mmoll(-l).
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