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Causes and Consequences of Changes in Marine Biodiversity: Invasive Species Invasive species can have dramatic effects on areas in which they invade, both ecologically and economically Heterosiphonia japonica Current invaded range of Heterosiphonia Higher abundances of Heterosiphonia are found in areas with lower biodiversity Heterosiphonia rapidly expanded its invaded range >700km within only five years of initial reports in Rhode Island. Factors contributing to its success as an invasive species, such as rapid growth rates and low palatability will be explored through field and laboratory experiments. Is Heterosiphonia reducing biodiversity by outcompeting native species? Or are more diverse communities more resistant to invasions? These questions are being explored through longterm underwater experiments. • • Ecologically, invasive species can alter community structure and food webs, as well as impact native biodiversity Economic impacts, such as reduced recreation and tourism and the collapse of fisheries can also result from invasive species Christine Newton, PhD Student [email protected] This research is taking advantage of a new subtidal invasive seaweed to document the spread and impacts of invaders across broad geographic regions A better understanding of the invasion and ecological dynamics of marine invasive species will allow coastal managers and stakeholders to make informed decisions regarding clean-up and management of these fragile habitats