. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 132 C. P. MANGUM ET AL. Table III Oxygen equilibrium constants and their 95",: confidence limits as estimated by regression amih i Species Pso(mmHg) L, "so Capitella sp. I sp. IA sp. II sp. IIIA MB/sl ORL Capitomastus NCS TAR TRIN VOZ
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 132 C. P. MANGUM ET AL. Table III Oxygen equilibrium constants and their 95",: confidence limits as estimated by regression amih i Species Pso(mmHg) L, "so Capitella sp. I sp. IA sp. II sp. IIIA MB/sl ORL Capitomastus NCS TAR TRIN VOZ in Capitella sp. I and la, 2n = 20 (Grassle et ai, 1989). The chromosome number in Capitomastus VOZ is not known. More importantly, most of the interspecific differences in O2 affinity are large and physiologically meaningful. The values can be grouped as follows (1) Capitomastus TRIN, (2) Capitomatsus VOZ and Capitomastus TAR, (3) Capitella sp. II and IIIA, (4) Capitella sp. I, IA and MB/sl, (5) Capitomastus NCS, and (6) Capitella ORL. To emphasize the magnitude of the interspecific dif- ferences, the range found in the present investigation is twice as great as that known in four species in the genus Glycera (Weber, 1978), which have never been regarded as cryptic. This comparison suffers from the unequal sample sizes. However, if the sample is enlarged and broadened to include all nine annelid and echiuroid RBC Hbs examined in the past two decades at a common tem- perature of 20°C (Mangum, 1992a), then the range re- ported here is still somewhat greater, despite the far nar- rower taxonomic scope. We suggest that the large range of O2 affinities is due to the similarly large geographic range of our sample (see below). In contrast, the values in the literature do not represent tropical or otherwise warm waters. We describe the 'cooperativity' of capitellid RBCs as apparent because many RBCs containing only monomeric and, when extracted and purified, non-cooper
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