Cost-Distance Analysis of Connectivity for an Avian Migrant Inhabiting a Fragmented Network
|Green, M. Clay
|Simper, William S.
|Ott, James R.
|Weckerly, Floyd W.
|Dispersal is key to the persistence of metapopulations and local populations. The Black-capped Vireo (Vireo atricapilla, hereafter BCVI) is an endangered Neotropical migrant that breeds in discrete patches of shrubland. On the Edwards Plateau a patchwork of this habitat is maintained through periodic disturbance. I applied a cost-distance scenario based on the amount of woody cover, level of human presence, and local topography, to a series of classified landcover maps of the Balcones Canyonlands region of central Texas to determine whether a cost distance model fit observed levels of dispersal of BCVI better than simple geographic (Euclidean) distance. Pair-wise connectivity values for a set of habitat patches on the Balcones Canyonlands Preserve (BCP) and Balcones National Wildlife Refuge (BCNWR) were evaluated for the 2008-2009 breeding seasons via a program of color-banding and resighting. Interpatch exchange rates were converted to measures of dissimilarity, entered into a pattern matrix, and confronted to model matrices containing effective distance values generated by cost-distance analysis, using simple and partial Mantel tests. Although statistical power was limited because of small sample size (n = 4), results provide weak support for the continued use of geographic distance as a metric for interpatch connectivity.
|1 file (.pdf)
|Simper, W. S. (2010). <i>Cost-distance analysis of connectivity for an avian migrant inhabiting a fragmented network</i> (Unpublished thesis). Texas State University-San Marcos, San Marcos, Texas.
|Balcones Canyonlands Preserve
|Cost-Distance Analysis of Connectivity for an Avian Migrant Inhabiting a Fragmented Network
|Population and Conservation Biology
|Texas State University-San Marcos
|Master of Science
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