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Relationships between alien plants and an alien bird species on Reunion Island

Published online by Cambridge University Press:  14 October 2004

Isabelle Mandon-Dalger
Affiliation:
CIRAD 3P, 7 chemin de l'IRAT, 97410 Saint Pierre, La Réunion, France
Philippe Clergeau
Affiliation:
INRA-SCRIBE & UMR EcoBio, Campus Beaulieu, 35042 Rennes cedex, France
Jacques Tassin
Affiliation:
CIRAD 3P, 7 chemin de l'IRAT, 97410 Saint Pierre, La Réunion, France
Jean-Noël Rivière
Affiliation:
CIRAD 3P, 7 chemin de l'IRAT, 97410 Saint Pierre, La Réunion, France
Sylvain Gatti
Affiliation:
CIRAD 3P, 7 chemin de l'IRAT, 97410 Saint Pierre, La Réunion, France

Abstract

Many studies have shown that plant or bird invasions can be facilitated by native species, but few have demonstrated the possibility of a positive interaction between introduced species. We analysed the relationships between four invasive alien fleshy-fruited plants, Clidemia hirta, Rubus alceifolius, Lantana camara, Schinus terebinthifolius, and an invasive alien bird, the red-whiskered bulbul Pycnonotus jocosus introduced to Reunion Island (Indian Ocean). We compared the distribution of food items in the bulbul diet according to seasons and to abundance classes of this bird. Pycnonotus jocosus is mostly frugivorous and frequently eats the main alien plants (more than 80% frequency of food items). Sites with alien species, such as Clidemia hirta, providing fruits throughout the year supported more birds than sites providing fruits, such as Schinus terebinthifolius, seasonally. The birds facilitated seed germination by removing the pulp of fruit: the final per cent germination (FG) of cleaned seeds was higher than those within the fruit for three of the four plant species and in some cases passage through birds significantly increased FG (Schinus terebinthifolius) or Coefficient of Velocity (CV) (Lantana camara).

Type
Research Article
Copyright
2004 Cambridge University Press

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