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Research article2019Peer reviewedOpen access

A highly resolved food web for insect seed predators in a species-rich tropical forest

Gripenberg, Sofia; Basset, Yves; Lewis, Owen T.; Terry, J. Christopher D.; Wright, S. Joseph; Simon, Indira; Fernandez, D. Catalina; Cedeno-Sanchez, Marjorie; Rivera, Marleny; Barrios, Hector; Brown, John W.; Calderon, Osvaldo; Cognato, Anthony I.; Kim, Jorma; Miller, Scott E.; Morse, Geoffrey E.; Pinzon-Navarro, Sara; Quicke, Donald L. J.; Robbins, Robert K.; Salminen, Juha-Pekka;
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Abstract

The top-down and indirect effects of insects on plant communities depend on patterns of host use, which are often poorly documented, particularly in species-rich tropical forests. At Barro Colorado Island, Panama, we compiled the first food web quantifying trophic interactions between the majority of co-occurring woody plant species and their internally feeding insect seed predators. Our study is based on more than 200 000 fruits representing 478 plant species, associated with 369 insect species. Insect host-specificity was remarkably high: only 20% of seed predator species were associated with more than one plant species, while each tree species experienced seed predation from a median of two insect species. Phylogeny, but not plant traits, explained patterns of seed predator attack. These data suggest that seed predators are unlikely to mediate indirect interactions such as apparent competition between plant species, but are consistent with their proposed contribution to maintaining plant diversity via the Janzen-Connell mechanism.

Keywords

Apparent competition; Barro Colorado Island; host specialisation; interaction network; Janzen-Connell hypothesis; Panama; plant traits; quantitative food web; seed predation

Published in

Ecology Letters
2019, Volume: 22, number: 10, pages: 1638-1649 Publisher: WILEY

      SLU Authors

    Associated SLU-program

    SLU Plant Protection Network

    UKÄ Subject classification

    Ecology

    Publication identifier

    DOI: https://doi.org/10.1111/ele.13359

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/101182