The context-dependence of beneficiary feedback effects in plant facilitations
Palabras ClaveAntagonistic plant–plant interactions, Beneﬁciary feedback effect, Competition, Context dependence, Facilitation, Nurse plant, Parasitism, Sstructural
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Facilitative effects of some species on others are a major driver of biodiversity. These positive effects of a benefactor on its beneﬁciary can result in negative feedback effects of the beneﬁciary on the benefactor and reduced ﬁtness of the benefactor. However, in contrast to the wealth of studies on facilitative effects in different environments, we know little about whether the feedback effects show predictable patterns of context dependence. We reanalyzed a global data set on alpine cushion plants, previously used to assess their positive effects on biodiversity and the nature of the beneﬁciary feedback effects, to speciﬁcally assess the context dependence of how small- and large-scale drivers alter the feedback effects of cushion-associated (beneﬁciary) species on their cushion benefactors using structural equation modelling. The effect of beneﬁciaries on cushions became negative when beneﬁciary diversity increased and facilitation was more intense. Local-scale biotic and climatic conditions mediated these community-scale processes, having indirect effects on the feedback effect. High-productivity sites demonstrated weaker negative feedback effects of beneﬁciaries on the benefactor. Our results indicate a limited impact of the beneﬁciary feedback effects on benefactor cushions, but strong context dependence. This context dependence may help to explain the ecological and evolutionary persistence of this widespread facilitative system.
|Editor||New Phytologist: DOI: 10.1111/nph.12908|
|Citación||Schöb C, Callaway R, Anthelme F, Brooker RW, Cavieres LA, Kikvidze Z, Lortie CJ, Michalet R, Pugnaire FI, Xiao S, Cranston B, García MC, Hupp N, Llambí LD, Lingua E, Reid A, Zhao L & Butterfield BJ. The context-dependence of beneficiary feedback effects in plant facilitations. New Phytologist 204(2):386-96 2014.|
|Institución||Universidad de Los Andes|