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Hunting influences the diel patterns in habitat selection by northern pintails Anas acuta

Wildlife Biology

By:
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DOI: 10.2981/09-099

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Abstract

Northern pintail Anas acuta (hereafter pintail) populations wintering within Suisun Marsh, a large estuarine managed wetland near San Francisco Bay, California,USA, have declined markedly over the last four decades. The reasons for this decline are unclear. Information on how hunting and other factors influence the selection of vegetation types and sanctuaries would be beneficial to manage pintail populations in SuisunMarsh. During 1991-1993, we radio-marked and relocated female pintails (individuals: N = 203, relocations: N = 7,688) within Suisun Marsh to investigate habitat selection during the non-breeding months (winter). We calculated selection ratios for different vegetation types and for sanctuaries, and examined differences in those ratios between hunting season (i.e. hunting and non-hunting), age (hatchyear and after-hatch-year), and time of day (daylight or night hours). We found that diel patterns in selection were influenced by hunting disturbance. For example, prior to the hunting season and during daylight hours, pintails selected areas dominated by brass buttons Cotula coronopifolia, a potentially important food source, usually outside of sanctuary boundaries. However, during the hunting season, pintails did not select brass buttons during daylight hours, but instead highly selected permanent pools, mostly within sanctuaries. Also, during the hunting season, pintails showed strong selection for brass buttons at night. Sanctuaries provided more area of permanent water pools than within hunting areas and appeared to function as important refugia during daylight hours of the hunting season. Wildlife managers should encourage large protected permanent pools adjacent to hunted wetlands to increase pintail numbers within wetland environments and responsibly benefit hunting opportunities while improving pintail conservation.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Hunting influences the diel patterns in habitat selection by northern pintails Anas acuta
Series title:
Wildlife Biology
DOI:
10.2981/09-099
Volume
18
Issue:
1
Year Published:
2012
Language:
English
Publisher:
Nordic Board for Wildlife Research
Publisher location:
Sacramento, CA
Contributing office(s):
Western Ecological Research Center
Description:
13 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Wildlife Biology
First page:
1
Last page:
13
Country:
United States
State:
California
Other Geospatial:
Suisun Marsh