Seed Banks, Salmon, and Sleeping Genes: Effective Population Size in Semelparous, Age‐Structured Species with Fluctuating Abundance
Seed Banks, Salmon, and Sleeping Genes: Effective Population Size in Semelparous, Age‐Structured Species with Fluctuating Abundance
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种子库、鲑鱼和睡眠基因：丰度波动的单胎、年龄结构物种的有效种群规模
DOI：
10.1086/498584
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
R. Waples
中科院分区：
文献类型：
--
作者：
R. Waples
Previous studies reached contrasting conclusions regarding how fluctuations in abundance affect Ne in semelparous species with variable age at maturity: that Ne is determined by the arithmetic mean N among the T years within a generation (
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$$N_{\mathrm{e}\,}\approx T\overline{N}_{t}$$
\end{document} ; monocarpic plants with seed banks) or the harmonic mean (
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$$N_{\mathrm{e}\,}\approx T\widetilde{N}_{t}$$
\end{document} ; Pacific salmon). I show that these conclusions arise from different model assumptions rather than inherent differences between the species. Sequentially applying standard, discrete‐generation formulas for inbreeding Ne to a series of nominal generations accurately predicts the multigenerational rate of increase in inbreeding. Variability in mean realized reproductive success across years (
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$$\overline{k}_{t}$$
\end{document} ) is the most important factor determining Ne and Ne/N. When abundance is driven by random variation in
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$$\overline{k}_{t}$$
\end{document} ,
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$$N_{\mathrm{e}\,}\leq T\widetilde{N}_{t}< T\overline{N}_{t}$$
\end{document} . With random variation in Nt and constant per capita seed production (C), variation in
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$$\overline{k}_{t}$$
\end{document} is low and
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$$N_{\mathrm{e}\,}\sim T\widetilde{N}_{t}$$
\end{document} ; however, if C varies among years, Ne can be closer to
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$$T\widetilde{N}_{t}$$
\end{document} . Because population regulation affects the genetic contribution of entire cohorts of monocarpic perennials, Ne for these species may be more closely approximated by
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$$T\widetilde{N}_{t}$$
\end{document} than by
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$$T\overline{N}_{t}$$
\end{document} . With density‐dependent compensation,
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$$\mathrm{Cov}\,( k_{t},\: N_{t}) < 0$$
\end{document} , and Ne is further reduced because relatively few breeders make a disproportionate contribution to the next generation.
Previous studies reached contrasting conclusions regarding how fluctuations in abundance affect Ne in semelparous species with variable age at maturity: that Ne is determined by the arithmetic mean N among the T years within a generation (
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$$N_{\mathrm{e}\,}\approx T\overline{N}_{t}$$
\end{document} ; monocarpic plants with seed banks) or the harmonic mean (
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$$N_{\mathrm{e}\,}\approx T\widetilde{N}_{t}$$
\end{document} ; Pacific salmon). I show that these conclusions arise from different model assumptions rather than inherent differences between the species. Sequentially applying standard, discrete‐generation formulas for inbreeding Ne to a series of nominal generations accurately predicts the multigenerational rate of increase in inbreeding. Variability in mean realized reproductive success across years (
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\usepackage{amsbsy}
\usepackage{amsfonts}
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$$\overline{k}_{t}$$
\end{document} ) is the most important factor determining Ne and Ne/N. When abundance is driven by random variation in
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$$\overline{k}_{t}$$
\end{document} ,
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$$N_{\mathrm{e}\,}\leq T\widetilde{N}_{t}< T\overline{N}_{t}$$
\end{document} . With random variation in Nt and constant per capita seed production (C), variation in
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\usepackage{amsbsy}
\usepackage{amsfonts}
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$$\overline{k}_{t}$$
\end{document} is low and
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$$N_{\mathrm{e}\,}\sim T\widetilde{N}_{t}$$
\end{document} ; however, if C varies among years, Ne can be closer to
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$$T\widetilde{N}_{t}$$
\end{document} . Because population regulation affects the genetic contribution of entire cohorts of monocarpic perennials, Ne for these species may be more closely approximated by
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$$T\widetilde{N}_{t}$$
\end{document} than by
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$$T\overline{N}_{t}$$
\end{document} . With density‐dependent compensation,
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$$\mathrm{Cov}\,( k_{t},\: N_{t}) < 0$$
\end{document} , and Ne is further reduced because relatively few breeders make a disproportionate contribution to the next generation.