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Behavioral Ecology Vol. 13 No. 6: 742-749
© 2002 International Society for Behavioral Ecology

Phenotypic selection and function of reproductive behavior in the subsocial bug Elasmucha putoni (Heteroptera: Acanthosomatidae)

Shin-ichi Kudo

Laboratory of Applied Zoology, Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589 and Department of Biology, Naruto University of Education, Naruto, Tokushima, 772-8502 Japan

Address correspondence to S. Kudo, Naruto University of Education, Naruto, Tokushima, 772-8502 Japan. E-mail: skudo{at}naruto-u.ac.jp.

To investigate the function of maternal care and determinants of reproductive success in the subsocial bug Elasmucha putoni (Heteroptera: Acanthosomatidae), I used two different approaches, the measurement of phenotypic selection and female-removal experiments under conditions differing in biotic-environmental pressure. For two field populations, unattended eggs and younger nymphs consistently suffered severe predation pressure and attendance by parent females greatly enhanced their survival. In contrast, under enemy-excluded conditions, offspring performance was not reduced in broods without parent females, indicating that maternal care functions as a physical defense against predators. However, the determinant of female reproductive success in E. putoni in the field was not the care behavior alone. Selection gradient analysis showed that early season oviposition and larger clutch size, as well as a longer duration of care by a female, was favored during the breeding episode. This study is the first to evaluate phenotypic selection on parental care and other reproductive traits in arthropods.

Key words: Elasmucha, Heteroptera, parental care, phenotypic selection, reproductive success, subsociality.


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