State Water Resources Research Institute Program


Project ID: 2011IN313B
Title: Niche breadth variation with seasonal changes in local habitats: fish assemblages of the Wabash River
Project type: Research
Start date: 3/01/2011
End date: 2/29/2012
Congressional district: IN-006
Focus categories: Ecology, Geomorphological Processes, Hydrogeochemistry
Keywords: Fish assemblages, geomorphology, hydrology, substrates
Principal Investigator: Pyron, Mark (Ball State University)
Federal funds: $ 13,000
Non-Federal Matching Funds: $ 27,298
Abstract: Understanding the species- and assemblage-habitat relationships of large river fishes has been historically limited by the large size and spatial complexity of river ecosystems. However, a Geographic Information System (GIS) database constructed with spatially explicit physical data as well as information on occurrences of individual taxa can provide ecologists with appropriate tools to detect habitat use patterns for species and assemblages in these ecosystems. This proposal describes a study to test hypotheses associated with environmental factors regulating river fish assemblages that have not been amenable with other analytical approaches. I apply a method for collecting and analyzing fish species data for a 30-km reach of the Wabash River to test the relationships between niche breadth, niche position, and species abundance. Niche breadth and niche position are calculated using environmental variables (bathymetry, riverbed sediment composition, woody debris presence, and flow velocity) assembled in a spatially explicit GIS framework. I will use three resolutions to determine at which scale niche breadth and position are correlated with population density, and how these relationships vary among two seasons.

Progress/Completion Report, 2011, PDF

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