REN R474 Lecture Notes - Lecture 3: North American Waterfowl Management Plan, Ducks Unlimited, Christian Culture
1 Oct 2016
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Document Summary
Usfws begins north american waterfowl surveys 1995: system of air-ground surveys implemented to address bias in aerial visibility of some species, breeding waterfowl populations in canada and the us. Usfws added waterfowl banding program to their work in alberta, 1959: provides data on, longevity and life span, migratory patterns, breeding sites, wintering sites, life-history characteristics - productivity, number of eggs per nest, edging success. Usfws introduced mid-summer aerial surveys to assess, 1962: annual brood numbers - clutch size, mean brood size, number of broods per 100 breeding pairs. What"s more important hunter harvest or changing habitat: populations uctuate in response to wetland availability, overall decline in the size of the mid-continent population, main debate - habitat changes or hunter harvests changing the populations (creating declines). Above a certain threshold hunting mortality is additive: base mortality level - if it is constant and then you add hunting and the mortality increases (additive).
