Phasmid Study Group

Stick insect & Leaf insect enthusiasts!

Feeding Preferences of Phasmids (Insecta: Phasmida) in a Bornean Dipterocarp Forest.

Publication Type:Journal Article
Year of Publication:2008
Authors:R. R. Junker, Itioka, T., Bragg, P. E., Blüthgen, N.
Journal:The Raffles Bulletin of Zoology
Volume:56
Issue:2
Start Page:445
Pagination:445-452
Date Published:08/2008
Keywords:Dryobalanops lanceolata, forest canopy, Haaniella echinata, herbivory, leaf age, lowland rainforest
Abstract:
Stick and leaf insects (Phasmida) from 19 species (53 individuals) were collected in a lowland dipterocarp forest (Lambir Hills, Sarawak, Malaysia).  Dual-choice tests were conducted to examine whether phasmids discriminate between young and old leaves of seven plant species.  A second set of tests examined the preferences of phasmids for leaves from Dryobalanops lanceolata (Dipterocarpaceae) saplings versus leaves from the upper canopy of the same tree species.  Haaniella echinata and other flightless species (Heteropterygidae and Lonchodinae) fed on nearly all plant species offered and showed significant preferences for old leaves in three plant species.  In contrast, flying phasmids (Ashiphasmatinae and Necrosciinae) rejected leaves from most plants and did not show consistent leaf age choices.  H. echinata and flightless phasmids preferred canopy leaves from D. lanceolata over leaves from saplings, regardless of leaf age.  Our results are consistent with the hypothesis that young leaves of some plant species are better defended against generalist herbivores than old leaves and that saplings are better defended than adult trees.  Since upper canopy leaves were highly palatable to understorey phasmids, factors other than chemical defences must contribute to the low abundance of phasmids in forest canopies.
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Mon, 2008-09-01 13:38 -- pbragg
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