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Morganne Borsh and colleagues explore how changes in fish passage could affect native and invasive fish populations in the Upper Mississippi River. The study uses metapopulation models to connect movement among river pools with longer-term population responses, considering both passage improvements and measures intended to deter invasive fish.
Six native species, including lake sturgeon and paddlefish, are compared with invasive silver carp. The authors assemble information on growth, maturity, spawning, recruitment and movement, then apply species models to scenarios that increase passage, reduce passage or combine passage and deterrent effects.
The report explains how the availability of biological data affects the simulations, especially where species-specific movement information is sparse. It also describes a point-and-click modeling interface and differences in response time for longer-lived fish. The result is a detailed examination of the relationship between river connectivity, ecological modeling and the information needed to compare management scenarios.