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Temporal repeatability of relative standard metabolic rate in juvenile Atlantic salmon and its relation to life history variation
Author(s) -
McCarthy I. D.
Publication year - 2000
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2000.tb00788.x
Subject(s) - biology , repeatability , salmo , juvenile , zoology , population , life history , fish <actinopterygii> , standard deviation , salmonidae , body weight , metabolic rate , limiting , fishery , demography , ecology , statistics , mathematics , endocrinology , mechanical engineering , sociology , engineering
There was a strong correlation between the relative standard metabolic rate (rSMR) values of individual Atlantic salmon Salmo salar L. measured 5 and 22 weeks after first feeding in June and October respectively (Pearson's r =0·68, 26 d.f., P <0·001). However, this is a conservative estimate of repeatability as two separate regressions were used to calculate SMR in October due to the separation of the population into an upper modal group made up of early migrants and a lower modal group comprised of delayed migrants. SMR values in June and October were similar (paired t test, t =‐0·85, 27 d.f., P >0·05) when expressed as the percentage deviation from those predicted for a fish of that size based on the body mass/SMR relations in June or October indicating that relative standard metabolic rates were stable over time when food was not limiting. rSMR status was maintained in 19 of the 28 fish (i.e. 68%) between the two measures. rSMR status was correlated with life history strategy: salmon fry with a high SMR in June were more likely to become smolts during the autumn than those with a low SMR.