Tri‐trophic interaction networks along a tree diversity gradient of BEF‐China

Aktivität: Vorträge und GastvorlesungenKonferenzvorträgeForschung

Michael Staab - Sprecher*in

    Multitrophic interactions involving producers and consumers are central elements of all ecosystems. 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.

    10.09.201214.09.2012

    Veranstaltung

    42. Jahresversammlung der Gesellschaft für Ökologie - GfÖ 2012: From Basic Ecology to the Challenges of Modern Society

    10.09.1214.09.12

    Lüneburg , Deutschland

    Veranstaltung: Konferenz

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