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Using landscape metrics to model source habitat for Neotropical migrants in the midwestern U.S.

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Abstract

Size of a forest patch is a useful predictor of density and reproductive success of Neotropical migratory birds in much of eastern North America. Within these forested landscapes, large forest tracts appear to be sources – fragments in which surpluses of offspring are produced and can potentially colonize new fragments including woodlot sinks where reproduction fails to balance adult mortality. Within agricultural landscapes of the midwestern U.S., where forests are severely fragmented, high levels of brood parasitism by brown-headed cowbirds (Molothrus ater) and intense predation on nests generally result in low reproductive success for Neotropical migrants regardless of forest size. In some midwestern U.S. landscapes, however, the variation in reproductive success among forest fragments suggests that `source' habitat could still exist for Neotropical migrants. We used vegetation, fragment and landscape metrics to develop multivariate models that attempt to explain the variation in abundance and reproductive success of Neotropical migrants nesting in an agricultural landscape in northern Indiana, USA. We produced models that reasonably described the pattern of species richness of Neotropical migrants and the abundance of wood thrushes (Hylocichla mustelina) and several other Neotropical migrant species within 14 forest fragments. In contrast, we were unable to produce useful models of the reproductive success of wood thrushes breeding in the same forest fragments. Our results suggest that (1) abundance patterns of Neotropical migrants are probably influenced by both landscape- and fragment-scale factors; (2) multivariate analyses of Neotropical migrant abundance are not useful in modeling the corresponding patterns of reproductive success; and (3) the location of any remaining `source' habitat for Neotropical migrants breeding within agricultural landscapes in North America will be difficult to predict with indirect measures such as vegetation composition or landscape context. As a result, the potential for developing conservation strategies for Neotropical migrants will be limited without labor-intensive, direct measurements of demographic parameters.

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Authors and Affiliations

  1. Department of Biological Sciences, Purdue University, Lilly Hall, West Lafayette, IN, 47907-1392, USA

    Peter T. Fauth & Kerry N. Rabenold

  2. North Central Research Station, Forestry Sciences Laboratory, USDA-Forest Service, 5985 Highway K, Rhinelander, WI, 54501, USA

    Eric J. Gustafson

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  1. Peter T. Fauth
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Correspondence to Peter T. Fauth.

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Fauth, P.T., Gustafson, E.J. & Rabenold, K.N. Using landscape metrics to model source habitat for Neotropical migrants in the midwestern U.S.. Landscape Ecology 15, 621–631 (2000). https://doi.org/10.1023/A:1008179208018

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