Tri‐trophic interaction networks along a tree diversity gradient of BEF‐China
Aktivität: Vorträge und Gastvorlesungen › Konferenzvorträge › Forschung
Michael Staab - Sprecher*in
forests, higher plants are the dominant producers and insect herbivores the most important consumers.
Besides visible consumption of plant tissue, more cryptic herbivory occurs through sap‐sucking insects,
particularly hemipterans. Some of these insects are involved in mutualistic associations with ants called
trophobiosis. The ants collect honeydew, a sugary liquid produced by the sucking insects and provide
protection against predators, parasitoids, and pathogens. Trophobiosis are common, especially in disturbed habitats. Nevertheless, it is still not known how multitrophic interactions are affected by tree
species diversity and tree diversity loss.
We observed over 7000 trees in an early successional forest in South‐East China. The field sites are part
of the BEF‐China ecosystem functioning experiment. Altogether, 408 interactions between plants,
sucking insects, and ants could be recorded on 15 tree species from five families. Three species of oaks
(Quercus ssp.) contributed to more than 55% of interactions, being by far the most preferred plants by
sucking insects. Around 30 species of sucking insects were collected, most of them Aphididae. They
were tended by 17 species of ants. Polyrhachis dives was the dominant ant species in the study site. It
tended 60% of the interactions.
We are currently analyzing how tree species diversity affects the overall structure and specialization of
the trophobiotic networks. This will help to predict the consequences of tree species loss for sap‐sucking
herbivores and plant fitness.
Veranstaltung
42. Jahresversammlung der Gesellschaft für Ökologie - GfÖ 2012: From Basic Ecology to the Challenges of Modern Society
10.09.12 → 14.09.12
Lüneburg , DeutschlandVeranstaltung: Konferenz
- Ökosystemforschung