Competition among small individuals hinders adaptive radiation despite ecological opportunity.
Competition among small individuals hinders adaptive radiation despite ecological opportunity.
复制标题
尽管有生态机会，但小个体之间的竞争阻碍了适应性辐射。
DOI：
10.1098/rspb.2021.2655
复制
发表时间：
2022-03-30
期刊：
影响因子：
--
通讯作者：
Seehausen O
中科院分区：
文献类型：
--
作者：
Ten Brink H;Seehausen O
在动物世界中，个体在发育过程中改变其资源使用的个体发生性饮食变化是普遍现象，而不是例外。在这里，我们的目标是了解在存在生态机会的情况下，发育期间饮食的这种变化如何影响适应性辐射的条件。我们使用一个规模结构的消费者资源模型和自适应动力学方法来研究物种形成的生态条件。我们假设小个体都以共享资源为食。另一方面，大型个体可以获得多种食物来源，它们可以专攻这些食物。我们发现，尽管大型个体有大量的生态机会，但小型个体之间的竞争可能会阻碍适应性辐射的展开。当小个体经历激烈的食物竞争时，它们生长缓慢，只有少数个体被招募到较大的群体中。因此，大型个体之间对食物的竞争很弱，因此不存在破坏性选择。此外，初始条件决定是否发生自适应辐射。最初由小个人主导的消费群体不会产生辐射。另一方面，最初由大型个体主导的种群可能会经历适应性辐射并分化成多物种。
Ontogenetic diet shifts, where individuals change their resource use during development, are the rule rather than the exception in the animal world. Here, we aim to understand how such changes in diet during development affect the conditions for an adaptive radiation in the presence of ecological opportunity. We use a size-structured consumer–resource model and the adaptive dynamics approach to study the ecological conditions for speciation. We assume that small individuals all feed on a shared resource. Large individuals, on the other hand, have access to multiple food sources on which they can specialize. We find that competition among small individuals can hinder an adaptive radiation to unfold, despite plenty of ecological opportunity for large individuals. When small individuals experience strong competition for food, they grow slowly and only a few individuals are recruited to the larger size classes. Hence, competition for food among large individuals is weak and there is therefore no disruptive selection. In addition, initial conditions determine if an adaptive radiation occurs or not. A consumer population initially dominated by small individuals will not radiate. On the other hand, a population initially dominated by large individuals may undergo adaptive radiation and diversify into multiple species.
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影响因子：
16.6
作者：
Bardua C;Fabre AC;Clavel J;Bon M;Das K;Stanley EL;Blackburn DC;Goswami A
通讯作者：
Goswami A
影响因子：
2.6
作者：
Klug, Hope;Bonsall, Michael B.
通讯作者：
Bonsall, Michael B.
影响因子：
3.9
作者：
Landi, Pietro;Vonesh, James R.;Hui, Cang
通讯作者：
Hui, Cang
DOI：
10.1073/pnas.0802343105
发表时间：
2008-10-07
影响因子：
11.1
作者：
Duponchelle, Fabrice;Paradis, Emmanuel;Turner, George F.
通讯作者：
Turner, George F.
影响因子：
6.5
作者：
Krug, Patrick J.;Vendetti, Jann E.;Valdes, Angel A.
通讯作者：
Valdes, Angel A.