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- Selective use of multiple cues by males reflects a decision rule for sex discrimination in a sexually mimetic damselfly .
- Change in diversity and nitrogen accrual following clearcutting and burning in bigtooth aspen ecosystems in northern lower Michigan .
- Shelter availability influences social behavior and habitat choice in crayfish, Orconectes virilis .
Understanding the Role of Turbulent Eddy Composition in Stream Ecosystem Services: Application of in-situ PIV to Habitat Selection Studies
The objective of this EAGER proposal is to demonstrate the applicability of in-situ particle image velocimetry (PIV) technology to address fluid mechanics questions that are difficult to answer in the laboratory. We will demonstrate this applicability by linking eddy composition to fish habitat selection. Despite the ubiquity and importance of turbulence in the fluvial environment, accurate measures of turbulent eddy composition (eddy diameter, vorticity, and orientation) in rivers are lacking. In-situ PIV extends laboratory particle image velocimetry to the field by using synchronized portable laser and imaging systems. The result is a temporal series of two-dimensional vector fields that can then be used to describe the size, orientation, distribution, and rotational strength of eddies in a river. These turbulent eddy metrics will be collected at locations where brown trout are observed station holding in a river. The results will, for the first time, describe the eddy characteristics of habitat selected by brown trout. The eddy characteristics of trout habitat will be compared to regions not occupied by the fish in order to also describe the habitat the fish are actively choosing against.