Discrete choice modeling of shovelnose sturgeon habitat selection in the Lower Missouri River

Journal of Applied Ichthyology
By: , and 

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Abstract

Substantive changes to physical habitat in the Lower Missouri River, resulting from intensive management, have been implicated in the decline of pallid (Scaphirhynchus albus) and shovelnose (S. platorynchus) sturgeon. To aid in habitat rehabilitation efforts, we evaluated habitat selection of gravid, female shovelnose sturgeon during the spawning season in two sections (lower and upper) of the Lower Missouri River in 2005 and in the upper section in 2007. We fit discrete choice models within an information theoretic framework to identify selection of means and variability in three components of physical habitat. Characterizing habitat within divisions around fish better explained selection than habitat values at the fish locations. In general, female shovelnose sturgeon were negatively associated with mean velocity between them and the bank and positively associated with variability in surrounding depths. For example, in the upper section in 2005, a 0.5 m s-1 decrease in velocity within 10 m in the bank direction increased the relative probability of selection 70%. In the upper section fish also selected sites with surrounding structure in depth (e.g., change in relief). Differences in models between sections and years, which are reinforced by validation rates, suggest that changes in habitat due to geomorphology, hydrology, and their interactions over time need to be addressed when evaluating habitat selection. Because of the importance of variability in surrounding depths, these results support an emphasis on restoring channel complexity as an objective of habitat restoration for shovelnose sturgeon in the Lower Missouri River.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Discrete choice modeling of shovelnose sturgeon habitat selection in the Lower Missouri River
Series title Journal of Applied Ichthyology
DOI 10.1111/j.1439-0426.2010.01637.x
Volume 27
Issue 2
Year Published 2011
Language English
Publisher Wiley
Publisher location Hoboken, NJ
Contributing office(s) Columbia Environmental Research Center
Description 10 p.
First page 291
Last page 300
Country United States
State Illinois, Iowa, Kansas, Missouri, Nebraska, South Dakota
Other Geospatial Lower Missouri River
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