Optimal Seed Size under Mixed Mating Systems When Predispersal and Postdispersal Inbreeding Depression Is Decoupled

被引:0
作者
Huang, Qiaoqiao [1 ]
机构
[1] Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Key Lab Integrated Pest Management Trop Crops, Minist Agr & Rural Affairs, Haikou 571101, Peoples R China
基金
中国国家自然科学基金;
关键词
inbreeding depression; mixed mating; outcrossed seeds; pollen limitation; seed size; selfed seeds; REPRODUCTIVE ASSURANCE; RESOURCE-ALLOCATION; SELF-FERTILIZATION; POLLEN LIMITATION; EVOLUTION; PLANTS; SELECTION; MASS; SURVIVAL; ABORTION;
D O I
10.1086/735011
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Inbreeding depression (ID) has different components, and how these affect selection on seed size is currently unknown. Using an optimality model, I find that when pollen limitation selects for mixed mating systems, increased predispersal ID (abortion of selfed ovules) increases the optimal sizes of both selfed and outcrossed seeds, whereas increased seed size-independent postdispersal ID (reduced survival of selfed seeds) only increases the size of outcrossed seeds. The effect of decreased efficiency of maternal investment in selfed seeds depends on details of the model assumptions, but in many cases it will increase resource allocation to both types of seeds. If seed size-independent postdispersal ID is less than 0.5, predispersal ID will select for selfed seeds receiving more maternal investment than outcrossed seeds. The same is true for decreased efficiency of maternal investment. If decreased efficiency of maternal investment leads to a reduction in selfed seed size, selfed seeds may end up being smaller than outcrossed seeds. The model highlights the complex roles ID plays in determining seed size and indicates that empirical measurement of postdispersal ID may underestimate its extent. Tests of the model may help us understand whether plants can adaptively allocate resources differentially between selfed and outcrossed seeds.
引用
收藏
页码:516 / 527
页数:12
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