Virginia Institute of Marine Science
Journal of Fish Biology
The resting metabolic rates (R ) of western North Atlantic Ocean sciaenids, such as Atlantic croaker Micropogonias undulatus, spot Leiostomus xanthurus and kingfishes Menticirrhus spp., as well as the active metabolic rates (R ) of M. undulatus and L. xanthurus were investigated to facilitate inter and intraspecific comparisons of their energetic ecology. The R of M. undulatus and L. xanthurus were typical for fishes with similar lifestyles. The R of Menticirrhus spp. were elevated relative to those of M. undulatus and L. xanthurus, but below those of high-energy-demand species such as tunas Thunnus spp. and dolphinfish Coryphaena hippurus. Repeated-measures non-linear mixed-effects models were applied to account for within-individual autocorrelation and corrected for non-constant variance typical of noisy R data sets. Repeated-measures models incorporating autoregressive first-order [AR(1)] and autoregressive moving average (ARMA) covariances provided significantly superior fits, more precise parameter estimates (i.e. reduced s.e.) and y-intercept estimates that more closely approximated measured R for M. undulatus and L. xanthurus than standard least-squares regression procedures.
intermittent-flow respirometry; metabolism; mixed-effects models; repeated measures; Sciaenidae
Horodysky, A. Z.; Brill, R. W.; Bushnell, P. G.; Musick, Jack A.; and Latour, R. J., Comparative metabolic rates of common western North Atlantic Ocean sciaenid fishes (2011). Journal of Fish Biology, 79, 235-255.