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Dr. Tiffany Garcia, OSU Department of Fisheries & Wildlife

Invasion Biology and the Successful Establishment of American bullfrogs: It Takes a Village

Thursday, October 4, 2012 3:30 PM - 4:30 PM

The field of invasion biology is experiencing a dramatic paradigm shift in research methodology and perspective.  Research has focused mainly on invasions that harm specific species or regions of conservation concern, or that have been deemed harmful to human health.  This limited perspective has created a disconnect between invasion biologists, land managers, and scientists in other ecological disciplines.  Incorporating ecological concepts such as biogeography and metapopulation theory into the study of invasive species will foster a broader arena in which to view biological invasions while maintaining regional or taxonomic applicability.  To demonstrate this, I will present three methodologies we are using to explore American bullfrog invasions (Lithobates catesbeianus) in the Pacific Northwest.  Using biogeographical methods, we have determined bullfrog populations in the southern extreme of the Pacific Northwest invasion range can be sourced back to the Mississippi River Valley. Further, a metapopulation approach has determined that these invasive phenotypes have likely diverged from the native range and are capable of metamorphosing at an accelerated rate.  Additionally, we have utilized experimental methods to quantify developmental and behavioral trait response to specific environmental stressors, such as ephemeral hydroperiods, novel predators, and UV-B radiation.  This integrated method of investigation is a powerful and unique approach for understanding biological invasions and will serve as a useful model for future studies of invasive species.

 



Hatfield Marine Science Center, Newport
Guin Library Seminar Room
Holger Klinck
541-867-0182
holger.klinck at noaa.gov
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