| Abstract: | Abundance of fishes of the main channels of the upper Mississippi River system and of other large North American rivers is largely unknown because historic sampling methods have been inadequate. We used a bottom trawl to estimate spatial and temporal patterns in abundance in the navigation channels of Pool 26 of the Mississippi River and the lower Illinois River. Total biomass density averaged 21 and 29 kg·ha-1 in the navigation channels of Pool 26 and the lower Illinois River, respectively. We identified spatial and temporal patterns in catches of key species using a generalized linear model based on the negative binomial distribution. Some species, including shovelnose sturgeon (Scaphirhynchus platorynchus), are persistent residents of the main channel. Multiple-season residents, including freshwater drum (Aplodinotus grunniens), rely heavily on the main channel during most of the year but leave it briefly, for example to seek thermal refugia in backwaters during winters. We suggest revision of the prevailing notion that main channels of large temperate rivers serve mainly as corridors for movement among other habitat types. |
| Genre: | Article |
| ProdID: | 70006865 |
| Citation Author: | Dettmers, J. M.; Gutreuter, S.; Wahl, D. H.; Soluk, D. A. |
| Citation Contributing Office: | Upper Midwest Environmental Sciences Center |
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| Citation End Page: | 942 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Canadian Journal of Fisheries and Aquatic Sciences |
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| Citation Number Of Pages: | 10 |
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| Citation Phsyical Description: | 10 p. |
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| Citation Public Comments: | Abstract has subscript/superscript to be fixed |
| Citation Publisher: | NRC Research Press |
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| Citation Search Results Text: | Patterns in abundance of fishes in main channels of the upper Mississippi River system; 2001; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Dettmers, J. M.; Gutreuter, S.; Wahl, D. H.; Soluk, D. A. |
| Citation Start Page: | 933 |
| Citation Volume: | 58 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Patterns in abundance of fishes in main channels of the upper Mississippi River system; 2001; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Dettmers, J. M.; Gutreuter, S.; Wahl, D. H.; Soluk, D. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1139/f01-046 |
| Date Other: | Sun, 1 Jan 2012 11:32 -0600 |
| Publisher: | NRC Research Press |
