Tuesday, August 7, 2007: 1:30 PM-5:00 PM
C3&4, San Jose McEnery Convention Center
OOS 18 - The link between propagule pressure and non-native invasion success and impacts
Propagule pressure, or the number of nonnative individuals introduced into a system, has been assigned special importance in determining habitat invasibility. It has been suggested that propagule pressure may be the most important factor in establishment of nonnative species of various taxa in a variety of ecosystems worldwide. Strong evidence is emerging that propagule pressure strongly determines likelihood of invasion. This session springs from a 2006 workshop, convened by the US-EPA, on future research and polichy directions concerning aquatic nonnative invaders. Speakers will: discuss the outcomes of the summer 2006 workshop; present an overview of how propagule pressure affects the different stages of invasion; and discuss the association between propagule pressure and nonnative invasion at genetic, population, community, and ecosystem levels of biological organization. The session will suggest research directions addressing the most effective ways to stem the tide of invasive species. The current lack of tools for assessing the impact of nonnative aquatic invaders is a serious technological gap that strongly affects the capacity to screen for potential invasive nonnatives; speakers will suggest frameworks for the assessment of impact of nonnative aquatic invaders and for ranking threats. Speakers will present the links between propagule pressure and invasion impacts which may provide evidence to drive future national policies relating to the import and transport of nonnative species.
Organizer:Betsy Von Holle, AAAS/EPA, University of Central Florida
Co-organizers:Michael Slimak, U.S. Environmental Protection Agency
James T. Carlton, Williams College
Moderator:Jeffrey Frithsen, U.S. Environmental Protection Agency
1:30 PMOOS 18-1Propagule pressure nodes and the invasion process
James T. Carlton, Williams College
1:50 PMOOS 18-2Genetic variation, propagule pressure, and the establishment and spread of invasive species
Joe Roman, University of Vermont
2:10 PMOOS 18-3The role of propagule pressure in invasion success of introduced Phragmites australis in North America
Laura A. Meyerson, The University of Rhode Island
2:30 PMOOS 18-4The importance of propagule source region as a component of propagule pressure for marine invasions
Edwin D. Grosholz, UC Davis, Gregory M. Ruiz, Smithsonian Environmental Research Center
2:50 PMOOS 18-5Geographic variation in non-native species richness and propagule supply for coastal marine ecosystems in North America
Gregory M. Ruiz, Smithsonian Environmental Research Center, Paul W. Fofonoff, Smithsonian Environmental Research Center, A. Whitman Miller, Smithsonian Environmental Research Center, Brian P. Steves, Smithsonian Environmental Research Center, Mark Minton, Smithsonian Environmental Research Center, Gail Ashton, Smithsonian Environmental Research Center
3:10 PM Break
3:20 PMOOS 18-6Understanding fish invasions across California: Propagules and water development
Michael P. Marchetti, Department of Biology
3:40 PMOOS 18-7Movement corridors as avenues of invasion of a deciduous forest by a non-native annual grass, Microstegium vimineum
Nathaniel P. Miller, Ohio University, Glenn R. Matlack, Ohio University
4:00 PMOOS 18-8Experimental isolation of factors increasing invader success: The role of the abiotic environment independent of propagule pressure
Jeffrey A. Crooks, Tijuana River National Estuarine Research Reserve, Andrew L. Chang, University of California, Davis, Gregory M. Ruiz, Smithsonian Environmental Research Center
4:20 PMOOS 18-9A ranking scheme for high-impact non-native aquatic invaders
Betsy Von Holle, University of Central Florida/ AAAS,EPA, Laura Biven, Plant Protection and Quarantine, USDA, Jeffrey Frithsen, U.S. Environmental Protection Agency, Cynthia Kolar, USGS, Michael P. Marchetti, Department of Biology, Sarah Reichard, University of Washington, Anthony Ricciardi, Redpath Museum, McGill University, Gregory M. Ruiz, Smithsonian Environmental Research Center

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