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摘要:
Adjusting foraging strategies is a common phenomenon within groups of animals competing for the same resource.In polytocous mammals,neonates concurrently compete for limited milk and alternate between two foraging (suckling) strategies:adaptable exploratory foraging with random sampling of teats,and ordered foraging with a tendency towards exploiting a particular suckling position.Some theoretical (game theory) models have shown that weaker siblings in particular benefit from foraging specialization (suckling order).Neonate piglets establish a well-defined suckling order that develops gradually and fluctuates throughout the lactation period,implying the existence of inter-individual differences in foraging strategies.We therefore analyzed suckling behavior in pigs to determine whether one foraging strategy was more beneficial to neonates in terms of their body weight and foraging environment.We found that intermediate and heavy littermates tended to adjust their suckling strategy according to the foraging environment;however,the selected foraging strategy did not affect their overall growth performance.Lighter individuals that consumed significantly less milk did not greatly alternate their foraging strategy according to the foraging environment,but their growth rate was significantly higher whenever they performed less-exploratory foraging behavior.Although suckling order appeared to be a relatively stable behavioral phenotype,it was beneficial exclusively for weaklings.These results confirm theoretical predictions and indicate that specializing in a suckling position is a beneficial strategy for weaker,light neonates.These findings suggest that physically weaker neonates might have driven the evolution of neonatal foraging specialization.
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篇名 In polytocous mammals, weakling neonates,but not their stronger littermates, benefit from specialized foraging
来源期刊 动物学报(英文版) 学科
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年,卷(期) 2019,(6) 所属期刊栏目
研究方向 页码范围 675-683
页数 9页 分类号
字数 语种 英文
DOI 10.1093/cz/zoz001
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期刊影响力
动物学报(英文版)
双月刊
1674-5507
11-5794/Q
16开
北京市朝阳区北辰西路1号院中国科学院动物所
1935
eng
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