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Weaker plant-enemy interactions decrease tree seedling diversity with edge-effects in a fragmented tropical forest.

Abstract：

:In fragmented forests, tree diversity declines near edges but the ecological processes underlying this loss of diversity remain poorly understood. Theory predicts that top-down regulation of seedling recruitment by insect herbivores and fungal pathogens contributes to maintaining tree diversity in forests, but it is unknown whether proximity to forest edges compromises these diversity-enhancing biotic interactions. Here we experimentally demonstrate that weakened activity of fungal pathogens and insect herbivores reduced seedling diversity, despite similar diversity of seed rain, during recruitment near forest edges in a human-modified tropical landscape. Only at sites farthest from forest edges (90-100 m) did the application of pesticides lower seedling diversity relative to control plots. Notably, lower seedling diversity corresponded with weaker density-dependent mortality attributable to insects and fungi during the seed-to-seedling transition. We provide mechanistic evidence that edge-effects can manifest as cryptic losses of crucial biotic interactions that maintain diversity.

journal_name

Nat Commun

journal_title

Nature communications

authors

Krishnadas M,Bagchi R,Sridhara S,Comita LS

doi

10.1038/s41467-018-06997-2

subject

Has Abstract

pub_date

2018-10-30 00:00:00

pages

4523

issue

1

issn

2041-1723

pii

10.1038/s41467-018-06997-2

journal_volume

9

pub_type

杂志文章

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