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VARIABILITY IN THE INFLUENCE OF PROPAGULE PRESSURE ON INVASION SUCCESS:LESSONS FROM THE BIOLOGICAL CONTROL OF LYTHRUM SALICARIA

VARIABILITY IN THE INFLUENCE OF PROPAGULE PRESSURE ON INVASI...

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International Congress on Biological Invasions

作者： Alice YEATES Shon SCHOOLER ralph garono Yvonne BUCKLEY University of Queensland St LuciaQLDAustralia CSIRO Entomology Long PocketQLDAustralia CSIRO Sustainable Ecosystems St LuciaQLDAustralia

Propagule pressure has been identified as a major correlate of invasion success. However,it is often difficult to examine,as release information is infrequently available and releases of invasive species are rarely manipulated to study invasion processes. Biological control programs therefore provide a unique opportunity to study the role of propagule pressure in invasion *** examine the persistence,colonization and abundance of four biological control agents(Galerucella pusilla and G. calmariensis(Coleoptera:Chrysomelidae),Nanophyes marmoratus(Coleoptera: Brentidae),and Hylobius transversovittatus(Coleoptera:Curculionidae)) released in the Lower Columbia River Estuary,USA,for the control of purple loosestrife(Lythrum salicaria,Lythraceae).We developed statistical models to identify which release and environmental variables were important in the different stages of invasion for each *** also examined both constituent parts of propagule pressure(release size and number of releases) at two spatial levels,1) local(nearest) and 2) regional(within 10km).Galerucella spp which had the highest release size and number of releases was more successful at colonizing new sites and reaching higher abundances at new sites,however,it had a lower likelihood of persistence than the other two genera. Environmental variables more often explained invasion success of these biological control agents(significant in 70%of models) than propagule pressure(30%of models) and residence time(10%of models).We conclude that the importance of propagule pressure differs depending on the type of measurement used,the scale examined, the invasion stage and whether it is assessed in an interaction with environmental variables.

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