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Published on: October 22, 2013
Dynamics of an experimental microbial invasion.
Francisco Acosta1, Richard M Zamor1, Fares Z Najar2
1Program in Ecology and Evolutionary Biology, Department of Biology, University of Oklahoma, Norman, OK 73019; Plankton Ecology and Limnology Laboratory, Department of Biology, University of Oklahoma, Norman, OK 73019;
High propagule pressure, not nutrients or diversity, drove the invasion success of the alga Prymnesium parvum in freshwater microbial communities. This finding is crucial for understanding and managing algal blooms in the southern US.
Area of Science:
- Ecology
- Microbial Ecology
- Invasion Biology
Background:
- Species invasions are well-studied in macroorganisms, but microbial invasions remain poorly understood.
- Prymnesium parvum is an invasive freshwater alga with significant ecological and economic impacts.
Purpose of the Study:
- To investigate the roles of propagule pressure, nutrient supply, and biotic resistance in the invasion success of Prymnesium parvum.
- To characterize the microbial community shifts associated with successful P. parvum invasion.
Main Methods:
- Microcosm experiments using natural freshwater microbial assemblages.
- Factorial design manipulating nutrient levels and propagule pressure.
- Tracking P. parvum densities and microbial community composition over 7 days.
Main Results:
- Successful invasion by P. parvum was strongly correlated with high propagule pressure.
- Nutrient supply and microbial community diversity did not significantly affect invasion success.
- Invaded communities showed increased fungi and ciliates, and decreased diatoms and cercozoans.
Conclusions:
- Propagule pressure is a key driver of P. parvum invasion in freshwater systems.
- Environmental changes and human impacts may increase the risk of P. parvum invasions, especially when coupled with high propagule pressure.
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