Thus, the respiration rates increased with increasing body mass and habitat temperature, but decreased with increasing depth. By the definition of dummy variables, respiration rates of the taxonomic categories for which regression coeffcients were not significant (p > 0.05. blanks in Table 2) are equivalent to therates of Loliginidae (Lo) for cephalopods and Myctophiformes (My) for fishes. Among the 16 designated taxonomic categories (families and orders) for cephalopods, Ommastrephidae (OM) and Gonatidae (Go) exhibited consistently higher respiration rates regardless of the choice of body mass units, while Cranchiidac (Cr), Histiateulthidae (His),Vainpyrnteucliidae (VA), and Octopoda (Oc) exhibited lower respiration rates on the basis of WM units only ( the latter three orders/families) or WM, C and N units (Cranchiidae). For the 14 fish orders. those characerized by higher or lower respiration rates varied depending on the choice of body mass units. Lophiiformres (Lo), Osmeriformes (Os) and Stephanoberycifarmcs (Ste) exhibited lower respiratian rates on the basis of WM units, and Lophiiformes (L0). on the bases of the DM and N units. Anguillifnrmes (An) was the only order that exhibited higher respiration rates on the basis of the DM. C and N units. Multicolinearity between these variables is considered small, because the variation inflation factors (VIF) of these variables (1.02-3.77 for the cephalopods,1.07-3.66 for the fishes, both not shown ) were <5 (cf. Kutner et al.,2004).
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