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Resource use of insect seed predators during general flowering and seeding events in a Bornean dipterocarp rain forest

Published online by Cambridge University Press:  09 March 2007

M. Nakagawa*
Affiliation:
Center for Ecological Research, Kyoto University, Kamitanakami-Hirano, Otsu, Shiga 520-2113, Japan
T. Itioka
Affiliation:
Laboratory of Applied Entomology, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
K. Momose
Affiliation:
Graduate School for Asian and African Area Studies, Kyoto University, Kyoto 606-8501, Japan
T. Yumoto
Affiliation:
Center for Ecological Research, Kyoto University, Kamitanakami-Hirano, Otsu, Shiga 520-2113, Japan
F. Komai
Affiliation:
Osaka University of Arts, Higashiyama 469, Kanan-cho, Osaka, 585-8555, Japan
K. Morimoto
Affiliation:
Faculty of Agriculture, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
B.H. Jordal
Affiliation:
School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
M. Kato
Affiliation:
Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan
H. Kaliang
Affiliation:
Forest Research Center, Sarawak, Batu 6, Jalan Penrissen, Kuching 93250, Sarawak, Malaysia
A.A. Hamid
Affiliation:
Forest Research Center, Sarawak, Batu 6, Jalan Penrissen, Kuching 93250, Sarawak, Malaysia
T. Inoue
Affiliation:
Center for Ecological Research, Kyoto University, Kamitanakami-Hirano, Otsu, Shiga 520-2113, Japan
T. Nakashizuka
Affiliation:
Research Institute for Humanity and Nature, Takashima-cho, Kamigyo-ku, Kyoto 602-0878, Japan CREST, Japan Science and Technology Corporation, Kawaguchi, Japan
*
*Fax: +81 77 549 8201 E-mail: miko@ecology.kyoto-u.ac.jp

Abstract

Insect seed predators of 24 dipterocarp species (including the genera of Dipterocarpus, Dryobalanops and Shorea) and five species belonging to the Moraceae, Myrtaceae, Celastraceae and Sapotaceae were investigated. In a tropical lowland dipterocarp forest in Sarawak, Malaysia, these trees produced seeds irregularly but intensely during general flowering and seeding events in 1996 and/or 1998. Dipterocarp seeds were preyed on by 51 insect species (11 families), which were roughly classified into three taxonomic groups: smaller moths (Tortricidae, Pyralidae, Crambidae, Immidae, Sesiidae and Cosmopterigidae), scolytids (Scolytidae) and weevils (Curculionidae, Apionidae, Anthribidae, and Attelabidae). Although the host-specificity of invertebrate seed predators has been assumed to be high in tropical forests, it was found that the diet ranges of some insect predators were relatively wide and overlapped one another. Most seed predators that were collected in both study years changed their diets between general flowering and seeding events. The results of cluster analyses, based on the number of adults of each predator species that emerged from 100 seeds of each tree species, suggested that the dominant species was not consistent, alternating between the two years.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2003

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