Habitat Selection Of The White-Ankled Mouse (Peromyscus pectoralis) In Val Verde Co., Texas




Morgan, Clint

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The purpose of this study conducted at the Devils River State Natural Area – Big Satan Unit (DRSNA - BSU), in Val Verde County, Texas, has been to delineate the seasonal vegetative resource selection of the White-ankled mouse (Peromyscus pectoralis), comparing trap-line indices of abundance, to geospatial plant community data. Trapping data were collected from trap-lines over a 21 month period (Feb 2013 - October 2014), resulting in 10,607 trap-nights and 185 P. pectoralis captures. Using ArcGIS software, trap-lines were buffered by the known approximate convex-polygon home range of P. pectoralis (A = 3,340m2), and spatially overlaid with the known active vegetation series of DRSNA – BSU. The percentage of each habitat within the buffered trap-line area was tested against the abundance indices of P. pectoralis using multiple linear regression modeling. Positive correlations were observed in winter and fall among the Lechuguilla-Sotol (P<0.001), Blackbrush (P<0.007), Guajillo (P<0.05), and Ashe Juniper-Oak vegetation series (P<0.03). Data suggests that vegetative habitat selection by P. pectoralis varies seasonally, and is likely dependent on the degree of seasonal resource availability within each vegetation type.



Habitat, Selection, Habitat suitability modeling, Peromyscus, Peromyscus pectoralis, White-ankled mouse, vegetation series