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Seed-dispersal interactions in fragmented landscapes – a metanetwork approach

AuthorsEmer, Carine; Galetti, Mauro; Pizo, Marco A.; Guimarães, Paulo R.; Moraes, Suelen; Piratelli, Augusto; Jordano, Pedro
KeywordsAtlantic Forest
avian seed‐dispersal interactions
beta‐diversity of interactions
ecological functions
habitat fragmentation
interaction centrality
mobile links
tropical conservation
Issue DateApr-2018
PublisherJohn Wiley & Sons
CitationEcology Letters 21(4): 484-493 (2018)
AbstractMutualistic interactions repeatedly preserved across fragmented landscapes can scale-up to form a spatial metanetwork describing the distribution of interactions across patches. We explored the structure of a bird seed-dispersal (BSD) metanetwork in 16 Neotropical forest fragments to test whether a distinct subset of BSD-interactions may mediate landscape functional connectivity. The metanetwork is interaction-rich, modular and poorly connected, showing high beta-diversity and turnover of species and interactions. Interactions involving large-sized species were lost in fragments < 10 000 ha, indicating a strong filtering by habitat fragmentation on the functional diversity of BSD-interactions. Persistent interactions were performed by small-seeded, fast growing plant species and by generalist, small-bodied bird species able to cross the fragmented landscape. This reduced subset of interactions forms the metanetwork components persisting to defaunation and fragmentation, and may generate long-term deficits of carbon storage while delaying forest regeneration at the landscape level.
Publisher version (URL)http://doi.org/10.1111/ele.12909
Appears in Collections:(EBD) Artículos
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