Intraspecific correlations between growth and defence vary with resource availability and differ within and among populations
Intraspecific correlations between growth and defence vary with resource availability and differ within and among populations
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DOI：
10.1111/1365-2435.13878
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发表时间：
2021-07-12
影响因子：
5.2
通讯作者：
Maron, John L.
中科院分区：
文献类型：
--
作者：
Hahn, Philip G.;Keefover-Ring, Ken;Maron, John L.
植物防御文献中的一个范例是，防御食草动物是以生长为代价的，导致生长-防御权衡。然而，虽然有强有力的证据表明，在物种之间的生长-防御权衡，证据是混合在物种内。几种机制可以解释这种模棱两可的支持在物种内，但要把它们分开，需要检查生长-防御关系内和种群之间，一种方法很少采用。我们研究了植物生物量（生长）和萜烯生产（防御）之间的相关性内和种群之间的Monarda fistulosa，一种多年生草本植物。我们从蒙大拿州和威斯康星州取样，这两个地区的资源可用性不同，其特点是夏季降水量不同，相关的非生物条件会影响植物的生产力。我们发现负，中性和正的生长防御相关性，这取决于研究的规模。负相关性发生在不同地区的人口之间，正相关性发生在来自高资源地区的人口之间，中性相关性被发现在单一population.Collectively，这些结果挑战普遍存在的权衡和支持新兴的观点，即资源的可用性（因为它影响生产力）形状在不同尺度的防御演变。可以在本文的支持信息中找到免费的简明语言摘要。
A paradigm in the plant defence literature is that defending against herbivores comes at a cost to growth, resulting in a growth-defence trade-off. However, while there is strong evidence for growth-defence trade-offs across species, evidence is mixed within species.Several mechanisms can account for this equivocal support within species, but teasing them apart requires examining growth-defence relationships both within and among populations, an approach seldom employed.We examined correlations between plant biomass (growth) and terpene production (defence) within and among populations of Monarda fistulosa, a perennial herb. We sampled populations from Montana and Wisconsin, regions that differ in resource availability characterized by different summer precipitation and associated abiotic conditions that influence plant productivity.We found negative, neutral and positive growth-defence correlations, depending on the scale examined. Negative correlations occurred across populations originating from divergent regions, positive correlations occurred across populations originating from within the high-resource region and neutral correlations were found within single populations.Collectively, these results challenge the general expectation of ubiquitous trade-offs and support emerging views that resource availability (as it affects productivity) shapes the evolution of defence at different scales. A free Plain Language Summary can be found within the Supporting Information of this article.