Professor Unlocks More Of The Mystery Surrounding Invasive Species (8/10/2007)

Many species of Salmon are anadromous and migrate long distances up rivers and streams to spawn.

Assessing the projected impacts of invasive species is a leading issue for scientists today. A major question for ecologists is determining which characteristics will predispose a species to be a good or bad colonizer when introduced into an ecosystem. New research from assistant professor at the UGA Odum School of Ecology John Drake adds another piece to the invasive species puzzle.

In a recent publication in Functional Ecology, Drake demonstrated that in fish, invasive species were more successful in relation to higher parental investment - meaning fish that bear live offspring or guard their eggs are more likely to be successful colonizers than those that lay eggs and do not guard them.

"This study will help scientists better predict establishment success in future introductions," said Drake. "Wildlife managers will benefit from this information because they can better identify traits predisposing species to successfully establish, making invasive species management plans more effective."

Drake was influenced to begin his study after research showed that successful establishment of birds linked with larger relative brain size. It was suggested that this could apply to all vertebrates, but Drake's research found no correlation between the two. Besides brain size, Drake's research also debunks another theory relating successful colonizers with higher numbers of total offspring.

"Classical theory predicts that colonizing ability should increase with the lifetime number of offspring," explained Drake. "However, for these fish introductions, this was not the case. In fact, the chance of successful establishment actually declined with fecundity."

Note: This story has been adapted from a news release issued by the University of Georgia

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