Trophic connections in Lake Superior Part I: the offshore fish community
Journal of Great Lakes Research
By: A.E. Gamble, T.R. Hrabik, J.D. Stockwell, and D.L. Yule
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Abstract
Detailed diet linkages within the offshore (> 80 m bathymetric depth) food web of Lake Superior are currently not well identified. We used analyses of fish stomach contents to create an empirically based food web model of the Lake Superior offshore fish community. Stomachs were collected seasonally (spring, summer, and fall) from nine offshore locations in 2005, using bottom and midwater trawls. In total, 2643 stomachs representing 12 fish species were examined. The predominant fish species collected were deepwater sculpin (Myoxocephalus thompsonii), siscowet (Salvelinus namaycush siscowet), kiyi (Coregonus kiyi), and cisco (Coregonus artedi). Mysis diluviana was the most common prey item, indicating that changes in Mysis abundance could have a profound impact on the entire offshore food web. Mysis was the primary diet item of deepwater sculpin (≥ 53% by mass) and kiyi (≥ 96% by mass) regardless of depth or season. The invasive Bythotrephes was an important diet component of the pelagic cisco in summer and fall. Deepwater sculpin were the primary diet item of siscowet (≥ 52% by mass), with coregonines appearing in the diet of larger (> 400 mm) siscowet. Non-metric multidimensional scaling analysis indicated that there were no statistically significant seasonal or site-specific differences in diets of deepwater sculpin, cisco, or kiyi. Site was the primary structuring factor in siscowet diets. Generally, in Lake Superior, the diet items of the dominant offshore species did not appear to be in danger from those types of major ecological shifts occurring in the lower Laurentian Great Lakes.
Suggested Citation
Gamble, A., Hrabik, T., Stockwell, J., and Yule, D., 2011, Trophic connections in Lake Superior Part I: the offshore fish community: Journal of Great Lakes Research, v. 37, no. 3, p. 541-549, https://doi.org/10.1016/j.jglr.2011.06.003.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Trophic connections in Lake Superior Part I: the offshore fish community |
| Series title | Journal of Great Lakes Research |
| DOI | 10.1016/j.jglr.2011.06.003 |
| Volume | 37 |
| Issue | 3 |
| Year Published | 2011 |
| Language | English |
| Publisher | Elsevier |
| Publisher location | Amsterdam, Netherlands |
| Contributing office(s) | Lake Superior Biological Station |
| Description | 9 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Great Lakes Research |
| First page | 541 |
| Last page | 549 |
| Other Geospatial | Lake Superior |