Long‐term patterns in growth of Oneida Lake walleye: a multivariate and stage‐explicit approach for applying the von Bertalanffy growth function
Total length (LT) and its inter annual variation of walleye Sander vitreus from Oneida Lake, New York, based on 51 years (1950–2000) of data for ages 1 to 7 years were analysed. Growth increased over time at young ages, did not change at intermediate ages and decreased at old ages. Total length at age increased over time to age 4 or 5 years, but was stable at older ages. Principle component analysis was used to study the pattern of variations in annual LT increments among years. More than 92 and 91% of inter annual variability in growth was described by the first three principal components for males and females, respectively. The first principal component was a general indicator of annual growth at all ages, but was dominated by annual growth at intermediate ages. The second and third principal components represented contrasts among yearling LT, yearling growth and growth at older ages. Therefore, changes in the three stage‐specific parameters, yearling LT, yearling growth and asymptotic LT, explained most of the variance in observed growth. Using these three stage‐specific parameters for the von Bertalanffy growth function facilitated interpretations of growth comparisons.
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inter annual variations;
principal component analyses;
von Bertalanffy growth function;
Document Type: Regular Paper
Michigan Department of Natural Resources, Fisheries Division, Lake Huron Research Station, 160 East Fletcher Street, Alpena, MI 49707, U.S.A.,
Department of Natural Resources and Cornell Biological Field Station, Cornell University, 900 Shackelton Point Road, Bridgeport, NY 13030, U.S.A. and
State University of New York, College of Environmental Science and Forestry, 103 Illick Hall, 1 Forestry Drive, Syracuse, NY 13210, U.S.A.
Publication date: 2005-05-01