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Food use and nutrition of black ducks nesting in Maine

Journal of Wildlife Management

based on 1977 thesis: The importance of freshwater invertebrates and female energy reserves for black ducks breeding in Maine. Thesis (Ph.D.), University of Maine at Orono.
By:
and

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Abstract

Based on 32 adult black ducks (Anas rubripes) collected during the nesting seasons of 1974-76, the proportion of macro invertebrates (as aggregate [average] percent of dry weight) in the diet of males, egg-laying females, and postlaying females was 60, 75, and 55%, respectivey. Sample sizes were small, and the differences associated with sex and reproductive condition were not signficant. Molluscs, Isopods, ephemeropteran and odonate nymphs, and coleopteran, trichopteran, and dipteran larvae contributed 74% of the dry weight and 64% of the gross energy ingested. Data from proximate analyses of 9 invertebrate and 9 plant foods were combined with food habits data to estimate the nutrients available to breeding hens. We concluded that females with access to an adequate amount of natural food including invertebrates and the seeds and tubers of aquatic plants would obtain sufficient minerals, protein, and energy for reproduction. Food quality does not appear to limit the density of black ducks nesting in Maine.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Food use and nutrition of black ducks nesting in Maine
Series title:
Journal of Wildlife Management
Volume
44
Issue:
3
Year Published:
1980
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
549-558
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Wildlife Management
First page:
549
Last page:
558