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Relationship Of Phenotypic Variation And Genetic Admixture In The Saltmarsh–Nelson's Sparrow Hybrid Zone, Jennifer Walsh, W. Gregory Shriver, Brian J. Olsen, Kathleen M. O'Brien, Adrienne I. Kovach
Relationship Of Phenotypic Variation And Genetic Admixture In The Saltmarsh–Nelson's Sparrow Hybrid Zone, Jennifer Walsh, W. Gregory Shriver, Brian J. Olsen, Kathleen M. O'Brien, Adrienne I. Kovach
New Hampshire Agricultural Experiment Station Publications
Hybridization is influential in shaping species' dynamics and has many evolutionary and conservation implications. Identification of hybrid individuals typically relies on morphological data, but the assumption that hybrids express intermediate traits is not always valid, because of complex patterns of introgression and selection. We characterized phenotypic and genotypic variation across a hybrid zone between 2 tidal-marsh birds, the Saltmarsh Sparrow (Ammodramus caudacutus) and Nelson's Sparrow (A. nelsoni) (n = 290), and we sought to identify morphological traits that could be used to classify admixed individuals. Sparrows were sampled from a total of 34 marshes, including 23 sympatric and 11 putatively …
Winter Site Fidelity In Secretive Marsh Sparrows Along The Coast Of South Carolina, Susan M. Shaw
Winter Site Fidelity In Secretive Marsh Sparrows Along The Coast Of South Carolina, Susan M. Shaw
Electronic Theses and Dissertations
Salt marshes, which are threatened by sea level rise and development, provide habitat for a distinctive suite of specialized vertebrates, and knowledge of the life histories of salt marsh specialists may help preserve salt marsh fauna in the face of change. I studied wintering site fidelity of Seaside (Ammodramus maritimus), Saltmarsh (A. caudacutus) and Nelson's (A. nelsoni) Sparrows by mist-netting and banding birds at six sites in two salt marshes in South Carolina. I banded 261 sparrows over two winters, 2009-2010 and 2010-2011, and recaptured 92. Across-year return rates were high, but significantly different across species: 43% for Seaside, 63% …