Abstract
The effects of temperature and oxygen tension ( P O 2 ) on the rate of oxygen consumption ( M ⋅ O 2 ) of three different Spanish strains of Artemia have been studied. Adults from each strain were able to tolerate acute exposure of temperature up to 35°. No differences were found between the M ⋅ O 2 of males and females of the bisexual strain. The M ⋅ O 2 increased with increasing temperature; Q 10 values varied between 1.82 and 2.04 for the three strains. The effect of temperature on M ⋅ O 2 was less in the parthenogenetic tetraploid strain than in the diploid strains (B, PD), which showed the lowest M ⋅ O 2 values. The ability of the adults to maintain respiratory independence during hypoxia was reduced at high temperatures. The differences in M ⋅ O 2 between tetraploid and diploid strains correlate well with the bio-geographical distribution of the three autochthonous Artemia strains of Spain.
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