Breeding migration and population stability
Breeding migration and population stability
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DOI：
10.1007/s10144-006-0025-1
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发表时间：
2007-04-01
影响因子：
1.7
通讯作者：
Yamamura, N.
中科院分区：
文献类型：
--
作者：
Nakazawa, T.;Yamamura, N.
我们通过对Takimoto(Am NAT 162：93-109,2003)的消费者-资源模型进行修正，用消费者个体发生的生态位转移来模拟繁殖的栖息地转移，以考察迁徙时间和种群稳定性之间的关系。我们发现，如果迁徙发生在固定的时间或能量储存水平，则平衡总是局部不稳定的，而如果迁徙的时间是适应性的，以最大限度地增加生殖产出，则平衡可能是稳定的。稳定的一般条件是更安全的繁殖而不是取食生境和取食生境丰富的资源。这些结果表明，在迁徙时机上采取适应性可塑性策略，以及选择从丰富的觅食生境迁徙到安全的繁殖生境，都有助于种群的稳定。我们还发现，由于迁徙延迟而导致的繁殖成功率下降，以及繁殖后的存活率，对稳定性有复杂的影响，这取决于取食栖息地的资源可用性。如果摄食生境丰富(或贫穷)，繁殖成功率仅略有(或极大)下降或存活率高(或低)，则平衡更有可能稳定。这些都是对迁徙动物生态学研究的重要预测。
We have modeled habitat shift for reproduction to examine the relationship between the timing of migration and population stability, by modifying Takimoto's (Am Nat 162:93-109, 2003) consumer-resource model with a consumer's ontogenetic niche shift. We found that equilibrium was always locally unstable if migration occurs at a fixed time or level of energy storage, whereas it could be stable if the timing of migration was adaptively flexible to maximize reproductive output. The general conditions for stability were safer breeding rather than feeding habitat and abundant resources at the feeding habitat. These results imply that both adopting an adaptive plastic strategy in the timing of migration and choosing to migrate from a rich feeding habitat to a safe breeding habitat can contribute to population stability. We also found that reduced reproductive success with delays in migration, and the survival rate after reproduction, had complicated effects on stability, depending on resource availability at the feeding habitat. The equilibrium was more likely to be stable when reproduction success was only slightly (or greatly) reduced or survival rate was high (or low) if the feeding habitat was rich (or poor). These are significant predictions for ecological study of migrating animals.