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Landscape and local effects on occupancy and densities of an endangered wood-warbler in an urbanizing landscape

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Abstract

Context

Golden-cheeked warblers (Setophaga chrysoparia), an endangered wood-warbler, breed exclusively in woodlands co-dominated by Ashe juniper (Juniperus ashei) in central Texas. Their breeding range is becoming increasingly urbanized and habitat loss and fragmentation are a main threat to the species’ viability.

Objectives

We investigated the effects of remotely sensed local habitat and landscape attributes on point occupancy and density of warblers in an urban preserve and produced a spatially explicit density map for the preserve using model-supported relationships.

Methods

We conducted 1507 point-count surveys during spring 2011–2014 across Balcones Canyonlands Preserve (BCP) to evaluate warbler habitat associations and predict density of males. We used hierarchical Bayesian models to estimate multiple components of detection probability and evaluate covariate effects on detection probability, point occupancy, and density.

Results

Point occupancy was positively related to landscape forest cover and local canopy cover; mean occupancy was 0.83. Density was influenced more by local than landscape factors. Density increased with greater amounts of juniper and mixed forest and decreased with more open edge. There was a weak negative relationship between density and landscape urban land cover.

Conclusions

Landscape composition and habitat structure were important determinants of warbler occupancy and density, and the large intact patches of juniper and mixed forest on BCP (>2100 ha) supported a high density of warblers. Increasing urbanization and fragmentation in the surrounding landscape will likely result in lower breeding density due to loss of juniper and mixed forest and increasing urban land cover and edge.

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Acknowledgments

We thank W. Dijak, U.S. Forest Service, and W. Simper, Travis County Natural Resources, for assisting with GIS analyses; P. Bullard, J. Edwardson, N. Flood, M. Frye, G. Geier, J. Halka, S. Stollery, and C. Weyenberg for assistance with data collection; the many BCP staff, partners, and volunteers, for collecting the territory mapping data; and G. Connette, C. Handel, R. Peak, J. Pierce, W. Reiner and two anonymous reviewers for comments on a draft of this manuscript. Funding for this research was provided by the City of Austin and USDA Forest Service Northern Research Station. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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Correspondence to Jennifer L. Reidy.

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Birds were banded under Bird Banding Lab Permit Number 23615 and University of Missouri ACUC Number 8383. Other activities were covered under U.S. Federal Permit TE798920-4 and Texas State Permit SPR1111378.

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Reidy, J.L., Thompson, F.R., Amundson, C. et al. Landscape and local effects on occupancy and densities of an endangered wood-warbler in an urbanizing landscape. Landscape Ecol 31, 365–382 (2016). https://doi.org/10.1007/s10980-015-0250-0

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