Diet differences in Redheads from nearshore and offshore zones in Louisiana

Journal of Wildlife Management
By:  and 

Links

Abstract

Habitat management decisions for diving ducks in winter are limited by the lack of information concerning their use of nearshore and offshore zones. Therefore, we compared diets of redheads (Aythya americana) collected from nearshore (n = 206) and offshore (n = 72) zones during winters at the Chandeleur Islands, Louisiana, 1987-89. A greater (P < 0.05) proportion of redheads from nearshore had food in their esophagus and proventriculus than redheads from offshore. Feeding redheads in the offshore zone consumed more (P < 0.05) animal matter (42% in esophagus) and less plant material (58%) than conspecifics feeding nearshore (13% animal, 87% plant). Contents of proventriculi showed the same trend (P < 0.05). Zone-related diet differences occurred in both sexes and in early and late winter. Food availability and nutritional needs may affect these differences.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Diet differences in Redheads from nearshore and offshore zones in Louisiana
Series title Journal of Wildlife Management
DOI 10.2307/3809419
Volume 57
Issue 2
Year Published 1993
Language English
Publisher Wiley
Contributing office(s) National Wetlands Research Center, Wetland and Aquatic Research Center
Description 7 p.
First page 238
Last page 244
Country United States
State Louisiana
Other Geospatial Chandeleur Islands