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Aphids and associated natural enemies on Ile Amsterdam and Ile Saint-Paul, Southern Indian Ocean

Published online by Cambridge University Press:  20 April 2010

Maurice Hullé*
Affiliation:
UMR 1099 BiO3P, INRA, BP 35327, F35653 Le Rheu cedex, France
Evelyne Turpeau
Affiliation:
UMR 1099 BiO3P, INRA, BP 35327, F35653 Le Rheu cedex, France
Sylvie Hudaverdian
Affiliation:
UMR 1099 BiO3P, INRA, BP 35327, F35653 Le Rheu cedex, France
Bernard Chaubet
Affiliation:
UMR 1099 BiO3P, INRA, BP 35327, F35653 Le Rheu cedex, France
Yannick Outreman
Affiliation:
UMR 1099 BiO3P, INRA, BP 35327, F35653 Le Rheu cedex, France
Marc Lebouvier
Affiliation:
UMR 6553 Ecobio, CNRS – Université de Rennes 1, Station Biologique, 35380 Paimpont, France

Abstract

Ile Amsterdam (37°50′S, 77°30′E, 55 km2) and Ile Saint-Paul (38°43′S, 77°31′E, 7 km2) are very isolated volcanic islands which were originally colonized by a few invertebrate fauna and flora. Invasive species richness has then increased along with human activity. A three-year monitoring programme (1997, 2000, 2001) and a summer campaign (2007) allowed species diversity, host plants, abundance and phenology of introduced aphids and natural enemies to be described. Seven cosmopolitan aphid species have been found on Ile Amsterdam (Aulacorthum solani, A. circumflexum, Macrosiphum euphorbiae, Myzus ascalonicus, M. cymbalariae, M. ornatus and Rhopalosiphum padi) and three on Ile Saint-Paul (A. solani, M. cymbalariae and R. padi). On Ile Amsterdam, these aphids were found on 28 host plants (out of 57 sampled plants), mainly introduced species. Phylica arborea was the only native plant much colonized by one aphid species, A. circumflexum. Aphids were mainly present on the base or in this vicinity. One Hymenopteran parasitoid, Aphidius matricariae, and two hyperparasites (Dendrocerus aphidum and Phaenoglyphis villosa), probably introduced along with their host, were collected. Aphid activity is very low during the autumn (March–May) and at a maximum in spring and summer. Their density and diversity decrease with distance from the research station. From these results, the possible impact of aphids on native plants is discussed.

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2010

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