PHENOLOGIC INFLUENCES ON COHORT-SPECIFIC REPRODUCTIVE STRATEGIES IN MICE (PEROMYSCUS-POLIONOTUS)
PHENOLOGIC INFLUENCES ON COHORT-SPECIFIC REPRODUCTIVE STRATEGIES IN MICE (PEROMYSCUS-POLIONOTUS)
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DOI：
10.2307/1936960
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发表时间：
1979-01-01
期刊：
影响因子：
4.8
通讯作者：
DAPSON, RW
中科院分区：
文献类型：
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作者：
DAPSON, RW
确定了2个种群的繁殖季节和出生队列。生殖努力的群体特异性差异与剩余生殖价值相关。在一个种群中，小鼠寿命接近2年，繁殖率适中，在群体特异性繁殖策略上几乎没有差异。另一种群的小鼠寿命小于1年，春、夏、秋出生的雌性小鼠表现出明显不同的生殖策略。能够在未来季节繁殖的群体有适度的繁殖努力，这不会增加死亡的风险。当剩余生殖价值变为0时，采取了特别措施（同时怀孕和哺乳），这严重增加了死亡率。当产仔数大于3窝时，雏鸟死亡率随产仔数的增加而增加，但产仔数大于产仔数的雏鸟断奶率仍高于产仔数较小的雏鸟。讨论了Pianka和Parker（1975）的模型。非常短命的哺乳动物种群在不同的繁殖策略下可能具有典型的季节性群体。
Breeding seasons and birth cohorts were defined for 2 populations of mice (P. polionotus). Cohort-specific differences in reproductive effort were correlated with residual reproductive value. In one population, mice lived nearly 2 yr, reproduced at moderate rates, and showed few differences in cohort-specific reproductive strategy. Mice from the other population lived < 1 yr, and spring-, summer- and fall-born females exhibited markedly different reproductive strategies. Cohorts able to breed in a future season had moderate reproductive efforts, which did not increase risk of mortality. Extraordinary efforts (being pregnant and lactating simultaneously), which seriously increased mortality rate, were undertaken when residual reproductive value became 0. Nestling mortality increased with litter size when there were more than 3 young/litter, but larger litters still resulted in more weaned young than did smaller litters. The model of Pianka and Parker (1975) was discussed. Populations of very short-lived mammals may characteristically have seasonal cohorts operating under different reproductive strategies.