Evol Ecol Res 7: 549-566 (2005) Full PDF if your library subscribes.
Sex-specific covariation among life-history traits of yellow perch (Perca flavescens)
C.F. Purchase,1* N.C. Collins,1 G.E. Morgan2 and B.J. Shuter3
1Department of Biology, University of Toronto at Mississauga, Mississauga, Ontario L5L 1C6, 2Cooperative Freshwater Ecology Unit, Department of Biology, Laurentian University, Sudbury, Ontario P3E 2C6 and 3Department of Zoology, University of Toronto, Toronto, Ontario M5S 3G5, Canada
Address all correspondence to Craig Purchase, Department of Biology, Dalhousie University, 1355 Oxford Street, Halifax, Nova Scotia B3H 4J1, Canada.
Questions: How do life-history traits covary among populations? Do two-trait models show different patterns of covariation than multi-trait models? Is covariation different for males and females? Is covariation among traits within populations (many generations) different to that among populations (one generation)?
Organism: A sexually dimorphic medium-sized freshwater fish, yellow perch (Perca flavescens).
Study system: Over 70 lakes in central North America.
Methods: Fish older than young-of-the-year were collected using standardized autumn surveys. Mean life-history traits were calculated for each population by sex.
Conclusions: Life-history traits generally covaried in the predicted manner among populations. Traditional two-trait comparisons resulted in similar conclusions as more complex models of covariation. Male and female patterns of covariation differed substantially for relationships between growth and age/size at maturation, moderately for lifespan and age at maturation, but were similar for size at maturation and maximum size. The relationships between female growth rate and maturation depended on the cause of variability in growth rates. Slow-growing populations matured young and small in warm lakes but old and large in cold lakes. Patterns of covariation in life-history traits were similar for temporal and spatial variability in traits.
Keywords: inter-population, intraspecific, life history, sexual dimorphism, yellow perch.
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