A comparative analysis of double-crested cormorant diets from stomachs and pellets from two Lake Ontario colonies
Journal of Freshwater Ecology
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Abstract
Double-crested cormorant (Phalacrocorax auritus) diets were compared with evidence from the stomachs of shot birds and from regurgitated pellets at High Bluff Island and Little Galloo Island, Lake Ontario. The highest similarity in diets determined by stomach and pellet analyses occurred when both samples were collected on the same day. Diet overlap dropped substantially between the two methods when collection periods were seven to ten days apart, which suggested differences in prey availability between the two periods. Since the average number of fish recovered in pellets was significantly higher than that in stomachs, use of pellets to determine fish consumption of double-crested cormorants may be more valid than stomach analysis because pellet content represent an integrated sampling of food consumed over approximately 24 hours.
Suggested Citation
Johnson, J.H., Ross, R.M., McCullough, R.D., and Mathers, A., 2010, A comparative analysis of double-crested cormorant diets from stomachs and pellets from two Lake Ontario colonies: Journal of Freshwater Ecology, v. 25, no. 4, p. 669-672, https://doi.org/10.1080/02705060.2010.9664417.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A comparative analysis of double-crested cormorant diets from stomachs and pellets from two Lake Ontario colonies |
| Series title | Journal of Freshwater Ecology |
| DOI | 10.1080/02705060.2010.9664417 |
| Volume | 25 |
| Issue | 4 |
| Year Published | 2010 |
| Language | English |
| Contributing office(s) | Great Lakes Science Center |
| Description | 4 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Freshwater Ecology |
| First page | 669 |
| Last page | 672 |
| Other Geospatial | High Bluff Island;Little Galloo Island |