Predispersal seed predation by insects vs. vertebrates in six dipterocarp species in Sarawak, Malaysia

Michiko Nakagawa, Yayoi Takeuchi, Tanaka Kenta, Tohru Nakashizuka

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    We investigated the predispersal survivorship of seeds of six dipterocarp species (Dipterocarpus globosus, D. tempehes, Dryobalanops aromatica, D. lanceolata, Shorea beccariana, and S. pilosa) during 2001-2002, when a general flowering occurred in Lambir Hills National Park, Sarawak, Malaysia. More immature seeds dropped during the first month in Dryobalanops and Shorea spp. than in Dipterocarpus spp. Insects attacked the seeds of all species during all developmental stages through to maturity, although temporal patterns varied among the dipterocarps. In contrast, arboreal vertebrates only occasionally ate seeds, and produced less damage than insects. In four species, insects damaged a significantly higher percentage of seeds than did vertebrates. Direct observations of seed survival patterns and bagging experiments using two sizes of mesh (cloth and wire) in the canopy of Dryobalanops aromatica identified insects as the principal seed predators during both the last phase, and overall. These results document the relative importance of insects as predispersal seed predators in these dipterocarp species.

    Original languageEnglish
    Pages (from-to)389-396
    Number of pages8
    JournalBiotropica
    Volume37
    Issue number3
    DOIs
    Publication statusPublished - 2005 Sep 1

    Keywords

    • Dipterocarpaceae
    • Predispersal stage
    • Seed predator
    • Tropical forest

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics

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