Subsocial and aggregating behaviour in Southeast Asian treehoppers (Homoptera: Membracidae: Centrotinae)
Stegmann, U.E. (University of Wuerzburg (Germany). Zoologie III) | Linsenmair, K.E.
Maternal care within the treehopper subfamily Centrotinae has been considered a rare trait. We present observations on maternal care and nymphal behaviour made in 16 rain forest plots in Peninsular Malaysia and Sabah, Borneo, from 1996 to 1998. Females of 11 Centrotinae morphospecies from the tribes Centrocharesini (Centrochares), Gargarini (Ebhul), and Hypsaucheniini (Gigantorhabdus, Hybandoides, Pyrgauchenia, Pyrgonota) produced egg clutches and guarded them. Maternal care was restricted to egg-guarding in all species. Pyrgonota ?bulbosa eggs hatched successively over a couple of days and females deserted their clutches when most, but not all, first instar nymphs had hatched. Nymphs of egg-guarding species lived gregariously and/or by subaggregating, as did some non-guarding species. Leptobelus dama, Gargara semibrunnea, and two Tricentrus spp. were solitary as nymphs and adults.
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