Abstract
distribution. However, delayed nest initiation may ease the energy demand at northern latitudes, thus allowing successful reproduction (Cain, 1973). Bolen et al. (1964) speculated that the black-bellied whistling duck's limited northern range expansion from the Lower Rio Grande Valley to the Lake Corpus Christi area may have been influenced by the creation of freshwater lakes and reservoirs. Data from this study show substantial additional range expansion that may or may not be related to the creation of freshwater impoundments, but which are still south of the Dallas area. We thank the Texas Parks and Wildlife De-
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