Pintail and Mallard Survival in California Relative to Habitat, Abundance, and Hunting
作者： JOSEPH P. FLESKES , JULIE L. YEE , GREGORY S. YARRIS , MICHAEL R. MILLER , MICHAEL L. CASAZZA
DOI: 10.2193/2005-634
关键词:
摘要: Abstract The influence of habitat, waterfowl abundance, and hunting on winter survival is not well understood. We studied late August–March 163 after-hatch-year (AHY) 128 hatch-year (HY) female mallards (Anas platyrhynchos) radiotagged in Sacramento Valley (SACV) 885 AHY northern pintails (A. acuta) throughout the Central California, USA, relative to flooded habitat (HAB), January abundance each species (JMAL or JPIN), hunter-days (HDY), a pressure index (HPI) that combined these variables. From EARLY (1987–1994) LATE (1998–2000), HAB increased 39%, JPIN 45%, JMAL 53%, HDY 21%, duck-hunting season from 59 days 100 days, daily bag limit doubled 2 for but remained 1 pintails. Survival (± SE) was greater during versus region (SACV: 93.2 ± 2.1% vs. 87.6 3.0%; Suisun Marsh: 86.6 3.2% 77.0 3.7%; San Joaquin...
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