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Diets of Swift Foxes (vulpes Velox) in Continuous and Fragmented Prairie in Northwestern Texas
Distribution of the swift fox (Vulpes velox) has declined dramatically since the 1800s, and suggested causes of this decline are habitat fragmentation and transformation due to agricultural expansion. However, impacts of fragmentation and human-altered habitats on swift foxes still are not well understood. To better understand what effects these factors have on diets of swift foxes, scats were ...
متن کاملVegetation of Prairie Dog Colonies and Non-Colonized Shortgrass Prairie
Black-tailed prairie dogs have declined by 98% in the past century. Due to continued declines, the U. S. Fish and Wildlife Service designated the species as a candidate for listing in 2000. Prairie dogs foster both plant and animal diversity, and their continued presence is a concern in the Great Plains. We compared vegetation structure and composition of black-tailed prairie dog (Cynomys ludov...
متن کاملPatterns of Area Sensitivity in Grassland-Nesting Birds
Between 1995 and 1997, we studied breeding birds in fragments of native tallgrass prairie in southwestern Missouri to determine the effect of habitat fragmentation on grassland bird populations. Data on density and nesting success collected in 13 prairie fragments of various sizes revealed three levels of area sensitivity. The most area-sensitive species, Greater Prairie-Chicken ( Tympanuchus c...
متن کاملWinter Use of South Florida Dry Prairie by Two Declining Grassland Passerines
reprintInfo.asp. DOI: 10.1525/cond.2009.080080 Resumen. Las aves que obligatoriamente viven en pastizales están sufriendo algunas de las disminuciones poblacionales más pronunciadas de todos los paserinos de América del Norte. Pocos estudios han tratado los patrones de uso de hábitat de estas especies mientras están invernando en el sudeste de Estados Unidos. La pradera seca del sur-centro de F...
متن کاملOn MPT-implication functions for Fuzzy Logic
This paper deals with numerical functions able to functionally express operators defined as , and verifying either Modus Ponens or Modus Tollens, or both. The concrete goal of the paper is to search for continuous t-norms and strong-negation functions for which it is either (Modus Ponens), or (Modus Tollens), or both, for all in and a given . Functions are taken among those in the most usual fa...
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