Heterogeneity in breeding productivity is driven largely by factors affecting nestlings and young fledglings in an imperiled migratory passerine

Identifying factors that drive variation in vital rates among populations is a prerequisite to understanding a species’ population biology and, ultimately, to developing effective conservation strategies. This is especially true for imperiled species like the golden-winged warbler (Vermivora chrysoptera) that exhibit strong spatial heterogeneity in demography and respond differently to conservation interventions. Habitat management actions recommended for breeding grounds conservation include timber harvest, shrub shearing, and prescribed fire that maintain or create early successional woody communities. Herein, we assessed variation in the survival of nests [n=145] and fledglings [n=134] at 17 regenerating timber harvests sites within two isolated populations in Pennsylvania that differed in productivity and response to habitat management. Although overall survival of nests and fledglings was higher in the eastern population than the central population, this was only true when the nest..., Herein are all MARK input files (which contain the analysis data), README file, and MARK .DBF and .FPT files which contain the analyses., , Description of subfolders: The \"INPfiles\" folder refers to MARK input files described below The \"MARKfiles\" folder refers to MARK (.DBF and .FPT) files to implement the input files mentioned above. Note that each .INP file (input file) has two MARK (.DBF and .FPT) files to implement the analysis in program MARK. The following are descriptions of the variables present in each analysis \########################## lifestages_eggsurvival /* day 1 = Julian date 134 for Pocs and day 1 = Julian date 141 for PA Wilds */ /* nesting season is 46 days in Pocs and 47 days in PA Wilds */ /* therefore, # occasions = 47 */ /* six values: i, j, k, f, n, and region ('pa wilds' vs 'poconos' where 0 = poconos) */ \# so, when you open this file, you'll see the three monitoring variables (i, j, and k) followed by \# fate (\"f\"; 1/0), number (\"n\"; always 1), and region. lifestages_nestlingsurvival /* day 1 = Julian date 134 for Pocs and day 1 = Julian date 141 for PA Wilds */ /* nesting season ...