Population Fluctuations, Reproductive Costs and Life-History Tactics in Female Soay Sheep
1. Though models of life-history decisions are traditionally based on age-related changes in the costs and benefits of reproduction, in nature both costs and benefits vary with individual differences in phenotype as well as with environmental changes. 2. Using long-term records of individual reprodu...
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| Veröffentlicht in: | The Journal of animal ecology 1996-11, Vol.65 (6), p.675-689 |
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| container_title | The Journal of animal ecology |
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| creator | Clutton-Brock, T. H. Stevenson, I. R. Marrow, P. MacColl, A. D. Houston, A. I. McNamara, J. M. |
| description | 1. Though models of life-history decisions are traditionally based on age-related changes in the costs and benefits of reproduction, in nature both costs and benefits vary with individual differences in phenotype as well as with environmental changes. 2. Using long-term records of individual reproduction and survival in the Soay sheep of St Kilda, we show that the costs and benefits of breeding to animals of different weight categories vary with population density. 3. Subsequently, we use stochastic dynamic programming to predict the optimal fecundity of animals belonging to each category at high and low population density. Optimal strategies of fecundity vary with population density as well as between different weight categories of sheep. However, there is no evidence that the sheep track density-related changes in optimal fecundity. Instead, their behaviour approximates to an average, weight-related optimum that is well adapted to the range of conditions that they encounter. |
| doi_str_mv | 10.2307/5667 |
| format | Article |
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Subsequently, we use stochastic dynamic programming to predict the optimal fecundity of animals belonging to each category at high and low population density. Optimal strategies of fecundity vary with population density as well as between different weight categories of sheep. However, there is no evidence that the sheep track density-related changes in optimal fecundity. Instead, their behaviour approximates to an average, weight-related optimum that is well adapted to the range of conditions that they encounter.</description><subject>Animal and plant ecology</subject><subject>Animal ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Animals</subject><subject>Autoecology</subject><subject>Biological and medical sciences</subject><subject>Birth weight</subject><subject>Breeding</subject><subject>Ecological life histories</subject><subject>Ewes</subject><subject>Fecundity</subject><subject>Fundamental and applied biological sciences. 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Using long-term records of individual reproduction and survival in the Soay sheep of St Kilda, we show that the costs and benefits of breeding to animals of different weight categories vary with population density. 3. Subsequently, we use stochastic dynamic programming to predict the optimal fecundity of animals belonging to each category at high and low population density. Optimal strategies of fecundity vary with population density as well as between different weight categories of sheep. However, there is no evidence that the sheep track density-related changes in optimal fecundity. Instead, their behaviour approximates to an average, weight-related optimum that is well adapted to the range of conditions that they encounter.</abstract><cop>Oxford</cop><pub>British Ecological Society</pub><doi>10.2307/5667</doi><tpages>15</tpages></addata></record> |
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| identifier | ISSN: 0021-8790 |
| ispartof | The Journal of animal ecology, 1996-11, Vol.65 (6), p.675-689 |
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| language | eng |
| recordid | cdi_proquest_miscellaneous_16079210 |
| source | Periodicals Index Online; Jstor Complete Legacy |
| subjects | Animal and plant ecology Animal ecology Animal, plant and microbial ecology Animals Autoecology Biological and medical sciences Birth weight Breeding Ecological life histories Ewes Fecundity Fundamental and applied biological sciences. Psychology Human ecology Mammalia Mortality Ovis aries Sheep Vertebrata |
| title | Population Fluctuations, Reproductive Costs and Life-History Tactics in Female Soay Sheep |
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