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Current Projects

 

Long-term fish assemblages respond to habitat and niche breadth in the West Fork White River, Indiana

Stephen J. Jacquemin and Jason C. Doll, 2013, Ecology of Freshwater Fish 22:280-294

Our objectives were to identify temporal patterns in fish assemblages from 1980 – 2010 in the West Fork White River in east-central Indiana using the Malthusian growth model and determine whether the population growth rate parameter corresponded with Grinnellian niche breadth. We used a Bayesian hierarchical model to estimate population abundance parameters of the Malthusian growth model. We identified significant changes in the fish assemblages; however, the patterns for temporal variation in individual species abundances were not conserved across sites. Grinnellian niche breadth was significantly related to the population growth rate at sites adjacent to low-head dam impoundments. We suggest that the presence of multiple impoundments has resulted in a fragmented series of fish assemblages.


white river fish Figure 4. Posterior distribution of ω (niche breadth parameter) estimated from the eight-two level hierarchical models.