Journal ArticleDOI
Harvest and dynamics of duck populations
James S. Sedinger,Mark P. Herzog +1 more
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TLDR
This paper found no compelling evidence for strong additive effects of harvest on survival in duck populations that could not be explained by other factors and concluded that harvest effects are typically confounded with those of population density; regulations are typically most liberal when populations are greatest.Abstract:
The role of harvest in the dynamics of waterfowl populations continues to be debated among scientists and managers. Our perception is that interested members of the public and some managers believe that harvest influences North American duck populations based on calls for more conservative harvest regulations. A recent review of harvest and population dynamics of North American mallard (Anas platyrhynchos) populations (Poysa et al. 2004) reached similar conclusions. Because of the importance of this issue, we reviewed the evidence for an impact of harvest on duck populations. Our understanding of the effects of harvest is limited because harvest effects are typically confounded with those of population density; regulations are typically most liberal when populations are greatest. This problem also exists in the current Adaptive Harvest Management Program (Conn and Kendall 2004). Consequently, even where harvest appears additive to other mortality, this may be an artifact of ignoring effects of population density. Overall, we found no compelling evidence for strong additive effects of harvest on survival in duck populations that could not be explained by other factors. © 2012 The Wildlife Society.read more
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Journal ArticleDOI
Individual heterogeneity in black brant survival and recruitment with implications for harvest dynamics.
TL;DR: This analysis provides a comprehensive view of overall compensation at the population level and constitutes the first example of a survival-recruitment model with heterogeneity, and should be more explicitly considered in harvest management of vertebrates.
The effects of harvest on waterfowl populations
TL;DR: In this article, the influence of population structure (age, spatial) on derivation of optimal harvest strategies (with and without explicit consideration of various sources of uncertainty) is considered, and the optimal harvest strategy may be influenced by patterns of density-dependence in one or more vital rates, and heterogeneity in vital rates among individuals within an age-sex-size class.
Journal ArticleDOI
Density dependence in ducks: a review of the evidence
Gunnar Gunnarsson,Johan Elmberg,Hannu Pöysä,Petri Nummi,Kjell Sjöberg,Lisa Dessborn,Céline Arzel +6 more
TL;DR: The picture of DD in ducks is far from complete, and knowledge gaps for future studies to address include: data from Russia, which holds a large part of the breeding ducks in the Northern hemisphere, and experimental studies on more species to separate density-dependent factors from other drivers of population change and to tease apart spatial and temporal interactions in the underlying processes.
Journal ArticleDOI
Impact of hunting along the migration corridor of pink-footed geese Anser brachyrhynchus – implications for sustainable harvest management
TL;DR: The findings highlight that the impact of harvest varies along the migration corridor and between age classes of a single species and suggest that allocation of hunting effort in time and space is important to optimise harvest.
Journal ArticleDOI
Studying long-term, large-scale grassland restoration outcomes to improve seeding methods and reveal knowledge gaps
TL;DR: In this paper, the effects of large-scale management activities on grassland restoration outcomes were investigated, and it was shown that reducing grass seed rates to atypically low levels will boost shrubs without compromising grasses.
References
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Book
Adaptive Management of Renewable Resources
TL;DR: In this article, the authors argue that scientific understanding will come from the experience of management as an ongoing, adaptive, and experimental process, rather than through basic research or the development of ecological theory.
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Individual Covariation in Life‐History Traits: Seeing the Trees Despite the Forest
TL;DR: The results provided confirmation of what has been suggested by other investigators: within‐cohort phenotypic selection can mask senescence, and the development of models permitting access to individual variation in fitness is a promising advance for the study ofsenescence and evolutionary processes.
Journal ArticleDOI
Bird population studies : relevance to conservation and management
TL;DR: The relevance of population studies to the conservation of threatened birds is examined, with a focus on population dynamics and extinction in heterogenous environments.