Seasonal subsidy stabilizes food web dynamics: Balance in a heterogeneous landscape
Seasonal subsidy stabilizes food web dynamics: Balance in a heterogeneous landscape
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DOI：
10.1046/j.1440-1703.2002.00502.x
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发表时间：
2002-07
影响因子：
2
通讯作者：
G. Takimoto;Tomoya Iwata;M. Murakami
中科院分区：
文献类型：
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作者：
G. Takimoto;Tomoya Iwata;M. Murakami
来自外部生境的资源补贴可对当地生境的食物网动态产生重大影响。在本文中，我们探讨了一个数学模型，是专门为溪流食物网，研究由中野和同事，其中消费者，在原地猎物和补贴都表现出季节性波动。该模型表明，食物网动态稳定，如果补贴增加在夏季时，在原地生产力低。由于补贴补充了季节性的资源不足，消费者的活力得以稳定。原位猎物动态稳定，因为补贴间接平衡消费者的捕食压力，与季节性变化的猎物承载能力。在夏季，当猎物承载力低，季节性丰富的补贴间接降低捕食压力，而在冬季，与高猎物承载力，稀缺的补贴增加捕食压力。我们的研究结果表明，时间生产力的空间联系的栖息地之间的差异是很重要的，以促进稳定的食物网动态景观背景下。
Resource subsidies from external habitats can substantially affect the food web dynamics of local habitats. In this paper, we explore a mathematical model that is tailored for a stream food web, studied by Nakano and colleagues, in which consumers, in situ prey and subsidies all show seasonal fluctuation. The model reveals that the food web dynamics are stabilized if subsidies increase in summer when in situ productivity is low. Consumer dynamics are stabilized because subsidies complement seasonal resource deficiency. In situ prey dynamics are stabilized because subsidies indirectly balance the predation pressure by consumers, with seasonal change in prey carrying capacity. In summer when prey carrying capacity is low, seasonally abundant subsidies indirectly decrease predation pressure, whereas in winter, with high prey carrying capacity, scarce subsidies increase the predation pressure. Our results suggest that temporal productivity differences between spatially linked habitats are important to promote the stability of food web dynamics in a landscape context.