منابع مشابه
Segregation , Discrimination , and African - American Theater Entry during Jim Crow ∗
We examine the role of residential segregation and racial discrimination in determining the entry of movie theaters serving African-American customers in the 1950s. These theaters provided an alternative to the segregated theaters of the Jim Crow era. Consistent with preference externalities in racial and ethnic enclaves, we find that a greater degree of residential segregation leads to more Af...
متن کاملComparative phylogeography of two crow species: jungle crow Corvus macrorhynchos and carrion crow Corvus corone.
The jungle crow Corvus macrorhynchos Wagler, 1827, and the carrion crow Corvus corone L., 1758, are two closely related species with similar ecological requirements that occupy wide distribution ranges in the Palearctic. We studied patterns of their genetic variation by using sequences of the mitochondrial cytochrome b gene. Corvus macrorhynchos demonstrates a low level of variation and differe...
متن کاملThe Inflected Alarm Caw of the American Crow: Differences in Acoustic Structure among Individuals and Sexes
Previous research on individual differences in the acoustic structure of vocalizations and vocal recognition has largely focused on the contexts of parent-offspring interactions, territory defense, sexual interactions, and group cohesion. In contrast, few studies have examined individual differences in the acoustic structure of mobbing and alarm calls. The purpose of this study was to explore i...
متن کاملDeclining mortality in American crow (Corvus brachyrhynchos) following natural West Nile virus infection.
The American crow (Corvus brachyrhynchos) is known to suffer 100% mortality from infection with the New York 1999 strain of West Nile virus (WNV). Following the initial detection of WNV in North America in 1999, we measured prevalence of WNV-reactive antibodies ("seroprevalence") in free-ranging American and fish crows (Corvus ossifragus) of central New Jersey after each transmission season thr...
متن کاملAutomating the Purple Crow Lidar
The Purple Crow LiDAR (PCL) was built to measure short and long term coupling between the lower, middle, and upper atmosphere. The initial component of my MSc. project is to automate two key elements of the PCL: the rotating liquid mercury mirror and the Zaber alignment mirror. In addition to the automation of the Zaber alignment mirror, it is also necessary to describe the mirror’s movement an...
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ژورنال
عنوان ژورنال: The Wilson Journal of Ornithology
سال: 2006
ISSN: 1559-4491,1938-5447
DOI: 10.1676/05-083.1