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Seasonality and the scheduling of life history at different latitudes

Seasonality and the scheduling of life history at different latitudes For many ectotherms, the annual cycle is partitioned into ‘growing’ (summer) and ‘non‐growing’ (winter) seasons, and the lengths of these seasons are inversely related across a latitudinal gradient. This pattern of variation has the potential to affect diverse life‐history traits profoundly. A key selective agent is size‐dependent winter mortality which, with increasing latitude, places an increasing premium on attainment of large body size before the first winter of life. Winter body size is determined primarily by two factors: (1) birth date, which defines the beginning of the first growing season and (2) somatic growth rate within the first season. Using examples drawn from the Atlantic silverside, Menidia menidia (L.), and other fishes, I show how latitudinal variation in the scheduling of the spawning season, countergradient variation in the capacity for growth and reproduction, and mode of sex determination (environmental v. genetic) represent adaptations to seasonality. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Biology Wiley

Seasonality and the scheduling of life history at different latitudes

Journal of Fish Biology , Volume 41 – Dec 1, 1992

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References (73)

Publisher
Wiley
Copyright
Copyright © 1992 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-1112
eISSN
1095-8649
DOI
10.1111/j.1095-8649.1992.tb03876.x
Publisher site
See Article on Publisher Site

Abstract

For many ectotherms, the annual cycle is partitioned into ‘growing’ (summer) and ‘non‐growing’ (winter) seasons, and the lengths of these seasons are inversely related across a latitudinal gradient. This pattern of variation has the potential to affect diverse life‐history traits profoundly. A key selective agent is size‐dependent winter mortality which, with increasing latitude, places an increasing premium on attainment of large body size before the first winter of life. Winter body size is determined primarily by two factors: (1) birth date, which defines the beginning of the first growing season and (2) somatic growth rate within the first season. Using examples drawn from the Atlantic silverside, Menidia menidia (L.), and other fishes, I show how latitudinal variation in the scheduling of the spawning season, countergradient variation in the capacity for growth and reproduction, and mode of sex determination (environmental v. genetic) represent adaptations to seasonality.

Journal

Journal of Fish BiologyWiley

Published: Dec 1, 1992

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