Harvest and dynamics of duck populations
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Cites background from "Harvest and dynamics of duck popula..."
...Direct effects of harvest on mortality rates and population dynamics vary as a function of body size (Rexstad 1992; Sedinger et al. 2007; Sedinger & Herzog 2012; Péron et al. 2012)....
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56 citations
Cites background from "Harvest and dynamics of duck popula..."
...…up resources for those surviving and potentially improving their survival in the following season (i.e. for every life taken, a life is saved; Boyce, Sinclair & White 1999), but the density-dependent mechanism could occur at various points along the seasonal life cycle (Sedinger & Herzog 2012)....
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...Unfortunately, this can induce a density-dependent relationship between abundance and harvest-related mortality that biases any assessment of compensation in harvest-related mortality (Sedinger & Herzog 2012)....
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...…a negative relationship between abundance and harvest-related mortality probabilities for both age classes (bN,hy = 1 24, 90% BCI: 1 51 to 0 97; bN,ahy = 0 68, 90% BCI: 0 89 to 0 47) and not the positive relationship that can induce bias in the estimation of compensation (Sedinger & Herzog 2012)....
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...…in adaptive harvest management programmes that density dependence and compensatory mortality are one and the same, and attempts at relating survival to proxies of harvest rates that are often confounded with other factors (Anderson & Burnham 1976; Nichols et al. 1984; Sedinger & Herzog 2012)....
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...…have affected heterogeneity among individual hy birds entering fall migration and subsequent heterogeneity in risks to being harvested or starving during the winter and spring migration (i.e. frailty: variability in mortality risks across individuals in a population; see Sedinger & Herzog 2012)....
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52 citations
References
3,131 citations
"Harvest and dynamics of duck popula..." refers background in this paper
...Adaptive management provides a mechanism for evaluating the relative performance of competing mathematical models to explain the dynamics of ecological systems (Walters 1986)....
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...In contrast, passive adaptive management relies ‘‘just on parameter revision’’ or fitting models in the absence of probing (Walters 1986:232)....
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...Active adaptive management relies on management actions as experiments or ‘‘deliberate probing for information,’’ intended to improve understanding of system dynamics (Walters 1986:232)....
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...More recently, adaptive management approaches (Walters 1986) have played a role in interpreting the effects of harvest on the dynamics of waterfowl populations (Johnson et al. 1997, Nichols et al. 2007)....
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2,259 citations
"Harvest and dynamics of duck popula..." refers background in this paper
...The current adaptive harvest management (AHM) program for ducks in the United States is an example of passive adaptive management (Johnson et al. 1997, Williams et al. 2001)....
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...In the context of such dramatic variation, it is not clear how to assess density dependence directly (Williams et al. 2001)....
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689 citations
"Harvest and dynamics of duck popula..." refers background or methods in this paper
...…The Journal of Wildlife Management 9999 model H02 of Brownie et al. (1985), which assumes that survival during each period of comparison was constant, versus models H1 or H2 of Brownie et al. (1985),…...
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...…hypothesis for 3 of 4 age–sex classes and marginally for the fourth (Smith and Reynolds 1992: Table 4); using a second method of estimating survival (H1 and H2 of Brownie et al. 1985), the composite test statistic was significant for 2 of 4 age–sex classes (Smith and Reynolds 1992: Table 5)....
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...…The Journal of Wildlife Management 9999 model H02 of Brownie et al. (1985), which assumes that survival during each period of comparison was constant, versus models H1 or H2 of Brownie et al. (1985), wherein survival was estimated annually and subsequently averaged for each period of comparison....
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...For example, Smith and Reynolds (1992) analyzed the same data set using 2 different methods to estimate survival: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 6 The Journal of Wildlife Management 9999 model H02 of Brownie et al. (1985), which assumes that survival during each period of comparison was constant, versus models H1 or H2 of Brownie et al. (1985), wherein survival was estimated annually and subsequently averaged for each period of comparison....
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...Harvest rates for waterfowl are typically estimated using band recovery rates estimated from Brownie models of band recoveries (Brownie et al. 1985), because such rates are directly related to harvest rates by the proportion of bands reported to the United States Geological Survey Bird Banding…...
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