Life history traits as predictors for biological invaders?

Duyck Pierre François, David Patrice, Quilici Serge. 2004. Life history traits as predictors for biological invaders?. In : Proceedings of a Workshop on biodiversity dynamics on la Réunion Island, Saint Pierre - Saint Denis, 29 November - 5 December 2004 = Atelier sur la dynamique de la biodiversité à la Réunion. Saint Pierre - Saint Denis, 29 novembre- 5 décembre 2004. Baret Stéphane (ed.), Rouget Mathieu (ed.), Nänni Ingrid (ed.), Le Bourgeois Thomas (ed.). Université de la Réunion, CIRAD. Saint-Denis : Université de la Réunion, p. 47. Atelier sur la dynamique de la biodiversité à la Réunion, Saint-Pierre, Réunion, 29 November 2004/5 December 2004.

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Abstract : Invasive species have often been said to display r-selected traits. However, when ecologically similar species are already established, interspecific competition rather than the ability to colonize or rapidly grow in numbers at low density could be the limiting factor of invasion, favouring K rather than r traits. We tested this idea using the "invasive series" approach. We define an invasive series as a suite of ecologically and/or taxonomically similar taxa invading the same region, characterised by hierarchical invasive ranks, in terms of ability to competitively displace each other and become numerically dominant in the invaded area. Three species of polyphagous fruit flies (Diptera: Tephritidae) that successively invaded the Reunion Island (initially occupied by a fourth, endemic species) together provide an example of such a series. We characterized life-history traits of these four species in optimal laboratory conditions, at all stages from egg to death in order to test whether invasive ranks were dependent on positions along an r-K gradient. Our results suggest an interspecific trade-off between K and r traits, and that the K lifestyle is associated with higher ranks in the invasive series. The resident endemic species is an exception, as it has low values for both r and K traits. Its competitive exclusion by the three invasive species is therefore explained by some form of maladaptation rather than by a strategy along an r-K trade-off. (Texte intégral)

Mots-clés Agrovoc : Tephritidae, Organisme nuisible, Pouvoir pathogène, Modèle, Cycle de développement, Compétition biologique, Biodiversité, Conservation de la nature, Génétique des populations, Espèce envahissante

Classification Agris : H10 - Pests of plants
P01 - Nature conservation and land resources

Auteurs et affiliations

  • Duyck Pierre François, CIRAD-FLHOR-PRH (REU)
  • David Patrice, CNRS (FRA)
  • Quilici Serge, CIRAD-FLHOR-ARF (REU)

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