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挥之不去的遗产
一个众所周知的例子是同种负密度依赖性(CNDD)--即一个物种在当地的丰度会对邻近同种幼苗的建立和表现产生负面影响。发表在《自然》(L. Hülsmann et al. Nature 627, 564-571; 2024)上的一项研究(J. A. LaManna.但是,CNDD 的影响是否会在树木死亡后继续存在,还没有人考虑过这个问题。佛罗里达大学的丹尼尔-约翰逊(Daniel Johnson)及其同事在《生态学通讯》(Ecology Letters)上发表的一篇文章中试图回答这个问题。对于同种个体来说,这可能是特别有利的,因为它们可以摆脱同种活树施加的 CNDD 限制。然而,Johnson 等人的分析表明情况恰恰相反:当相邻的同种树木死亡时,该个体会继续对其余活树的生存产生负面影响。
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