Body condition dependent dispersal in a heterogeneous environment
Body condition dependent dispersal in a heterogeneous environment
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DOI：
10.1016/j.tpb.2011.02.004
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发表时间：
2011-06-01
影响因子：
1.4
通讯作者：
Utz, Margarete
中科院分区：
文献类型：
--
作者：
Gyllenberg, Mats;Kisdi, Eva;Utz, Margarete
我们发现了一个种群的进化稳定的扩散行为，该种群栖息在一个异质的环境中，其中补丁在安全性（一个少年个体存活到繁殖的概率）和生产力（由当地个体产生的后代的总竞争力）方面有所不同，假设这些特征不随时间而改变。无性繁殖后代的身体状况在家庭内部和家庭之间各不相同。后代在加权彩票中竞争补丁，并且扩散是由亲属竞争驱动的。扩散过程中的生存可能取决于身体状况，竞争能力随着身体状况的增加而增加。进化稳定策略预测，家庭放弃斑块太不安全或没有产生足够的成功扩散。从家庭投资，以保持其纳塔尔补丁，个人留在补丁不太适合分散，而更好的分散。然而，这种明确的家庭内的模式往往没有反映在人口范围内的身体状况分布的扩散或非扩散。这可能是一个解释，为什么经验数据没有显示身体状况和扩散之间的任何一般关系。当所有的个体都是同样好的扩散，然后存在等价类定义的竞争重量，仍然在一个补丁。一个等价类由无穷多个选择中性的分散策略组成。这就解释了为什么在身体状况依赖的扩散数据中发现的非常不同的模式都可以同样地进化稳定。(C)2011 Elsevier Inc. All rights reserved.
We find the evolutionarily stable dispersal behaviour of a population that inhabits a heterogeneous environment where patches differ in safety (the probability that a juvenile individual survives until reproduction) and productivity (the total competitive weight of offspring produced by the local individual), assuming that these characteristics do not change over time. The body condition of clonally produced offspring varies within and between families. Offspring compete for patches in a weighted lottery, and dispersal is driven by kin competition. Survival during dispersal may depend on body condition, and competitive ability increases with increasing body condition.The evolutionarily stable strategy predicts that families abandon patches which are too unsafe or do not produce enough successful dispersers. From families that invest in retaining their natal patches, individuals stay in the patch that are less suitable for dispersal whereas the better dispersers disperse. However, this clear within-family pattern is often not reflected in the population-wide body condition distribution of dispersers or non-dispersers. This may be an explanation why empirical data do not show any general relationship between body condition and dispersal.When all individuals are equally good dispersers, then there exist equivalence classes defined by the competitive weight that remains in a patch. An equivalence class consists of infinitely many dispersal strategies that are selectively neutral. This provides an explanation why very diverse patterns found in body condition dependent dispersal data can all be equally evolutionarily stable. (C) 2011 Elsevier Inc. All rights reserved.