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Feeding ecology of waterfowl wintering on evaporation ponds in California

Condor

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Abstract

We examined the feeding ecology of Northern Pintails (Anas acuta), Northern Shovelers (A. clypeata), and Ruddy Ducks (Oxyura jamaicensis) wintering on drainwater evaporation ponds in California from 1982 through 1984. Pintails primarily consumed midges (Chironomidae) (39.3%) and widegeongrass (Ruppia maritima) nutlets (34.6%). Shovelers and Ruddy Ducks consumed 92.5% and 90.1% animal matter, respectively. Water boatmen (Corixidae) (51.6%), rotifers (Rotatoria) (20.4%), and copepods (Copepoda) (15.2%) were the most important Shoveler foods, and midges (49.7%) and water boatmen (36.0%) were the most important foods of Ruddy Ducks. All three species were opportunistic foragers, shifting their diets seasonally to the most abundant foods given their behavioral and morphological attributes.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Feeding ecology of waterfowl wintering on evaporation ponds in California
Series title:
Condor
Volume
93
Year Published:
1991
Language:
English
Contributing office(s):
Northern Prairie Wildlife Research Center
Description:
p. 582-590
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Condor
First page:
582
Last page:
590