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A comparative analysis of double-crested cormorant diets from stomachs and pellets from two Lake Ontario colonies

Journal of Freshwater Ecology

By:
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DOI: 10.1080/02705060.2010.9664417

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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.

Additional Publication Details

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