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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Contrasting dynamics in the same plant-herbivore interaction
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Contrasting dynamics in the same plant-herbivore interaction

机译:同一植物-草食动物相互作用中的动态对比

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摘要

Long-term studies of two-species interactions under field conditions are unusual; most long-term field studies are of single species dynamics (1-6). Concurrent long-term studies on the dynamics of the same two interacting species in different locations are very rare. This result has led to the tacit assumption that different cases of the same two-species interaction would involve essentially quantitative differences (e.g., context-specific differences in the numeric values of demographic parameters like fecundity or death rates). Here, we show that for one of the best-known two-species systems (ragwort and cinnabar moth), this finding does not hold. The interaction between the plant and its herbivore is fundamentally different in coastal dunes in The Netherlands and in grasslands in Southeast England. In the first case, the dynamics are cyclic and the interaction involves both direct and delayed density dependence; in the second case, the insect has little impact on plant dynamics and there are no time lags in density dependence. The difference is caused by differences in the importance of seed-limitation in plant recruitment in the two locations.
机译:在田间条件下对两种物种相互作用的长期研究是不同寻常的。大多数长期的田间研究都是针对单个物种的动力学(1-6)。同时在不同位置对两个相同物种相互作用的长期研究非常少见。该结果导致了一个默认的假设,即相同的两种物种相互作用的不同情况在本质上将涉及数量上的差异(例如,人口统计学参数(如生育力或死亡率)的数值的特定于上下文的差异)。在这里,我们表明,对于最著名的两种物种系统之一(豚草和朱砂蛾),这一发现并不成立。在荷兰的沿海沙丘和英格兰东南部的草地上,植物与其草食动物之间的相互作用有根本的不同。在第一种情况下,动力学是循环的,相互作用涉及直接和延迟的密度依赖性。在第二种情况下,昆虫对植物动力学的影响很小,并且密度依赖性没有时间滞后。差异是由于在两个地点的植物招募中种子限制的重要性不同。

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