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Community structure of pre-dispersal seed predatory insects on eleven Shorea (Dipterocarpaceae) species

Published online by Cambridge University Press:  08 October 2009

Tetsuro Hosaka ,
Takakazu Yumoto ,
Hiroaki Kojima ,
Furumi Komai  and
Nur Supardi Md. Noor
Tetsuro Hosaka
Affiliation:
Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
Takakazu Yumoto
Affiliation:
Research Institute for Humanity and Nature, Kyoto 603-8047, Japan
Hiroaki Kojima
Affiliation:
Tokyo University of Agriculture, Kanagawa 243-0034, Japan
Furumi Komai
Affiliation:
Osaka University of Arts, Osaka 585-8555, Japan
Nur Supardi Md. Noor
Affiliation:
Forest Research Institute Malaysia, Kepong, Selangor 52109, Malaysia
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Abstract:

The Dipterocarpaceae in South-East Asia are known for their strict mast fruiting. During fruiting, pre-dispersal seed predation by insects contributes to mortality of dipterocarp seeds. We documented the community structure of insect seed predators on 11 Shorea species in Peninsular Malaysia. Fruits were sampled sequentially throughout seed development, and 2144 and 1655 individuals of seed predator weevils and moths were collected in two mast-fruiting events. Four weevils: Nanophyes shoreae, nanophyid sp. 1, Alcidodes dipterocarpi and Alcidodes humeralis, and one moth Andrioplecta shoreae were abundant in seeds of the Shorea species. The proportion of N. shoreae to the total predators became larger in the latter fruiting event than the former while that of Alcidodes spp. became smaller. The predator species composition changed during seed development; nanophyid spp. emerged from immature fruits while Alcidodes spp. emerged from mature fruits. Andrioplecta shoreae emerged from both immature and mature fruits. The level of host specificity measured by Kullback–Leibler distance was low for most predator species in both events. Predator species composition of many Shorea was similar to each other due to the dominance of N. shoreae though it might gradually differ with the phylogenetic distance between hosts. In conclusion, predator species composition of Shorea varied during seed development within a host rather than among hosts. Intermittent synchronized fruiting by congeneric Shorea trees would be advantageous to avoid pre-dispersal insect seed predators, and contribute to their reproduction.

Keywords

AlcidodesAndrioplectadipterocarpgeneral floweringmastingNanophyidaepre-dispersal seed predationpredator satiation
Type
Research Article
Information
Journal of Tropical Ecology , Volume 25 , Issue 6 , November 2009 , pp. 625 - 636
Copyright
Copyright © Cambridge University Press 2009

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