Cohort effects in red squirrels: the influence of density, food abundance and temperature on future survival and reproductive success

The Journal of Animal Ecology
Sébastien DescampsJean-Michel Gaillard

Abstract

1. Environmental conditions experienced early in life may have long-lasting effects on individual performance, thereby creating 'silver-spoon effects'. 2. We used 15 years of data from a North American red squirrel (Tamiasciurus hudsonicus Erxleben) population to investigate influences of food availability, density and spring temperature experienced early in life on reproduction and survival of female squirrels during adulthood. 3. We found that spring temperature and food availability did not affect female survival after 1 year of age, whereas higher squirrel densities led to lower survival, thereby affecting longevity and lifetime fitness. 4. In addition, both food availability experienced between birth and weaning, and spring temperature in the year of birth, had long-lasting positive effects on female reproductive success. These results emphasize the critical effect environmental conditions during the early life stages can have on the lifetime performance of small mammals. 5. These long-term effects of early food and temperature were apparent only once we controlled for conditions experienced during adulthood. This suggests that silver-spoon effects can be masked when conditions experienced early in life are correlated to s...Continue Reading

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Citations

Jan 9, 2009·Proceedings. Biological Sciences·Sébastien DescampsJean-Michel Gaillard
Nov 5, 2011·Theoretical Population Biology·Yngvild VindenesSteinar Engen
Apr 21, 2009·Physiology & Behavior·Heiko G Rödel, Dietrich von Holst
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Apr 28, 2021·Ecology Letters·Shripad TuljapurkarJean-Michel Gaillard

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