| DOI: | 10.1111/ele.12800
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| Scopus记录号: | 2-s2.0-85025090280
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| 论文题名: | Should mothers provision their offspring equally? A manipulative field test |
| 作者: | Cameron H.; Monro K.; Marshall D.J.
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| 刊名: | Ecology Letters
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| ISSN: | 1461023X
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| EISSN: | 1461-0248
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| 出版年: | 2017
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| 卷: | 20, 期:8 | | 起始页码: | 1025
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| 结束页码: | 1033
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| 语种: | 英语
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| 英文关键词: | bet-hedging
; complementarity
; fitness
; life-history theory
; maternal provisioning
; niche partitioning
; offspring size
; sibling interactions
; within-brood variation
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| Scopus关键词: | Invertebrata
; animal
; female
; invertebrate
; mother
; reproduction
; Animals
; Female
; Invertebrates
; Mothers
; Reproduction
|
| 英文摘要: | Within-brood variation in offspring size is universal, but its causes are unclear. Theoretical explanations for within-brood variation commonly invoke bet-hedging, although alternatives consider the role of sibling competition. Despite abundant theory, empirical manipulations of within-brood variation in offspring size are rare. Using a field experiment, we investigate the consequences of unequal maternal provisioning for both maternal and offspring fitness in a marine invertebrate. We create experimental broods of siblings with identical mean, but different variance, in offspring size, and different sibling densities. Overall, more-variable broods had higher mean performance than less-variable broods, suggesting benefits of unequal provisioning that arise independently of bet-hedging. Complementarity effects drove these benefits, apparently because offspring-size variation promotes resource partitioning. We suggest that when siblings compete for the same resources, and offspring size affects niche usage, the production of more-variable broods can provide greater fitness returns given the same maternal investment; a process unanticipated by the current theory. © 2017 John Wiley & Sons Ltd/CNRS |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/107584
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Centre for Geometric Biology, School of Biological Sciences, Monash University, Melbourne, VIC, Australia
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| Recommended Citation: | |
Cameron H.,Monro K.,Marshall D.J.. Should mothers provision their offspring equally? A manipulative field test[J]. Ecology Letters,2017-01-01,20(8)
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