Influence of dams and habitat condition on the distribution of redhorse (Moxostoma) species in the Grand River watershed, Ontario
Environmental Biology of Fishes
By: S.M. Reid, N.E. Mandrak, L.M. Carl, and C.C. Wilson
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Abstract
Redhorse, Moxostoma spp., are considered to be negatively affected by dams although this assertion is untested for Canadian populations. One hundred and fifty-one sites in the Grand River watershed were sampled to identify factors influencing the distribution of redhorse species. Individual species of redhorse were captured from 3 to 32% of sites. The most widespread species were golden redhorse, M. erythrurum (30%) and greater redhorse, M. valenciennesi (32%), while river redhorse, M. carinatum, was only found along the lower Grand River. Redhorse were absent from the highly fragmented Speed River sub-watershed and upper reaches of the Conestogo River and the Grand River. Redhorse species richness was positively correlated to river fragment size and upstream drainage area. Generalized additive models (GAMs) were applied to evaluate the influence of river fragment length, connectivity and habitat on species distribution. Principal component analysis reduced habitat data to three axes representing: channel structure, substrate, and pool, riffle and run habitats (PC1); gradient and drainage area (PC2); and cover (PC3). GAMs indicate that PC2 was important for predicting black redhorse and greater redhorse site occupancy and PC1 was important for golden redhorse. River fragment length was important for predicting site occupancy for shorthead redhorse, but not other species. ?? 2006 Springer Science+Business Media, Inc.
Suggested Citation
Reid, S., Mandrak, N., Carl, L., Wilson, C., 2008, Influence of dams and habitat condition on the distribution of redhorse (Moxostoma) species in the Grand River watershed, Ontario: Environmental Biology of Fishes, v. 81, no. 1, p. 111-125, https://doi.org/10.1007/s10641-006-9179-0.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Influence of dams and habitat condition on the distribution of redhorse (Moxostoma) species in the Grand River watershed, Ontario |
| Series title | Environmental Biology of Fishes |
| DOI | 10.1007/s10641-006-9179-0 |
| Volume | 81 |
| Issue | 1 |
| Publication Date | December 23, 2006 |
| Year Published | 2008 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Environmental Biology of Fishes |
| First page | 111 |
| Last page | 125 |