Mathematics and Mallard Management

Cowardin, Lewis M.; Johnson, Douglas H.

doi:10.2307/3800632

Cited by 96 publications

(40 citation statements)

References 16 publications

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“…In the Great Lakes, the estimated renesting probability was 50% (Claassen et al 2014); however, we didn't have renesting probabilities for our population. We used the following equation for female success (FS) to account for nesting attempts following nest failure (Cowardin and Johnson 1979 …”

Section: Discussionmentioning

confidence: 99%

Demographic response of Piping Plovers suggests that engineered habitat restoration is no match for natural riverine processes

et al. 2018

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Section: Discussionmentioning

confidence: 99%

Demographic response of Piping Plovers suggests that engineered habitat restoration is no match for natural riverine processes

et al. 2018

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“…Nest survival, as an index of productivity, does not account either for nesting attempts following a failure (renesting) or for repeated nesting after raising a brood (double brooding; Grzybowski and Pease 2005). For waterfowl, Cowardin and Johnson (1979) and Johnson et al (1992) illustrated the relationship between nest survival and the success of an entire breeding season. For songbirds, nest survival alone may not be an accurate index to fecundity in some situations.…”

Section: Reviewsmentioning

confidence: 99%

Recent advances in understanding migration systems of New World land birds

Faaborg

Holmes

Anders

et al. 2010

Ecological Monographs

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Abstract. Our understanding of migratory birds' year-round ecology and evolution remains patchy despite recent fundamental advances. Periodic reviews focus future research and inform conservation and management; here, we take advantage of our combined experiences working on Western Hemisphere avian migration systems to highlight recent lessons and critical gaps in knowledge. Among topics discussed are: (1) The pipeline from pure to applied researchers leaves room for improvement. (2) Population limitation and regulation includes both seasonal and between-season interactions. (3) The study of movements of small-bodied species remains a major research frontier. (4) We must increase our understanding of population connectivity. (5) With few exceptions, population regulation has barely been investigated. (6) We have increasingly integrated landscape configuration of habitats, large-scale habitat disturbances, and habitat quality impacts into models of seasonal and overall demographic success. (7) The post-breeding season (late summer for latitudinal migrants) is increasingly appreciated for its impacts on demography. (8) We recognize the diverse ways that avian brood parasites, nest predators, and food availability affect demography. (9) Source-sink and meta-population models help us understand migratory avian distributions among fragmented habitats. (10) Advances in modeling have improved estimates of annual survival and fecundity, but for few species. (11) Populations can be limited by ecological conditions in winter, but habitat needs are poorly known for most species at this time. (12) Migration tends to occupy broad spatial fronts that may change seasonally or when migrants cross major barriers. En route conditions can limit migrant populations; linking migration habitat quality indicators to fitness or population consequences presents a major challenge. (14) A variety of intra-tropical Neotropical migration patterns are recognizable, but almost nothing is known about these systems beyond descriptions of a few typical species' movements. (15) Global climate change scenarios predict range and phenology shifts of Neotropical migrant bird populations that must be considered in conservation plans. Future studies will depend on new technologies and the integration of modeling with sophisticated, large-spatial-scale measurement and parameter estimation; whether the pace of research and management involving migratory birds can match the growth of environmental threats remains to be seen.

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“…Measurement of brood survival is essential for calculating recruitment from nesting data (Cowardin and Johnson 1979). Yet, survival and mortality patterns during the prefledging period are poorly understood.…”

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confidence: 99%