The unexpected influence of legacy conspecific density dependence

IF 7.6 1区环境科学与生态学 Q1 ECOLOGY Ecology Letters Pub Date : 2024-06-10 DOI:10.1111/ele.14449

Lukas J. Magee, Joseph A. LaManna, Amy T. Wolf, Robert W. Howe, Yuanming Lu, Denis Valle, Daniel J. B. Smith, Robert Bagchi, David Bauman, Daniel J. Johnson

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Abstract

When plants die, neighbours escape competition. Living conspecifics could disproportionately benefit because they are freed from negative intraspecific processes; however, if the negative effects of past conspecific neighbours persist, other species might be advantaged, and diversity might be maintained through legacy effects. We examined legacy effects in a mapped forest by modelling the survival of 37,212 trees of 23 species using four neighbourhood properties: living conspecific, living heterospecific, legacy conspecific (dead conspecifics) and legacy heterospecific densities. Legacy conspecific effects proved nearly four times stronger than living conspecific effects; changes in annual survival associated with legacy conspecific density were 1.5% greater than living conspecific effects. Over 90% of species were negatively impacted by legacy conspecific density, compared to 47% by living conspecific density. Our results emphasize that legacies of trees alter community dynamics, revealing that prior research may have underestimated the strength of density dependent interactions by not considering legacy effects.

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遗留的同种密度依赖性的意外影响。

当植物死亡时，相邻的植物就会摆脱竞争。活着的同种植物可能会因为摆脱了种内负面过程而获益过多；但是，如果过去的同种邻居的负面影响持续存在，其他物种可能会获益，多样性可能会通过遗留效应得以维持。我们利用四种邻近属性：活着的同种、活着的异种、遗留的同种（死去的同种）和遗留的异种密度，对 23 个物种的 37,212 棵树的存活率进行建模，从而检验了映射森林中的遗留效应。事实证明，遗留的同种影响比活着的同种影响强近四倍；与遗留的同种密度相关的年存活率变化比活着的同种影响大 1.5%。超过 90% 的物种受到遗留同种密度的负面影响，而受到活体同种密度影响的物种仅占 47%。我们的研究结果强调了树木的遗留物会改变群落动态，揭示了之前的研究可能因为没有考虑遗留物的影响而低估了密度依赖性相互作用的强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ecology Letters 环境科学-生态学

CiteScore

17.60

自引率

3.40%

发文量

201

审稿时长

1.8 months

期刊介绍： Ecology Letters serves as a platform for the rapid publication of innovative research in ecology. It considers manuscripts across all taxa, biomes, and geographic regions, prioritizing papers that investigate clearly stated hypotheses. The journal publishes concise papers of high originality and general interest, contributing to new developments in ecology. Purely descriptive papers and those that only confirm or extend previous results are discouraged.

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