منابع مشابه
Patterns of geographic variation and evolution in polytypic butterflies
Patterns of geographic variation and evolution are examined in polytypic butterflies. It is concluded that genetic and evolutionary cohesion at the full species level is limited to monotypic organisms that are strongly vagile or migratory. Polytypic species with a fragmented population structure lack such cohesion, and each isolated population tends to function as an independent evolutionary un...
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Drosophila melanogaster, an ancestrally African species, has recently spread throughout the world, associated with human activity. The species has served as the focus of many studies investigating local adaptation relating to latitudinal variation in non-African populations, especially those from the United States and Australia. These studies have documented the existence of shared, genetically...
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This paper presents a measure of Internet “connectivity” (number of connected companies per capita) normalized by the economic “size ” of areas in the United States. We use cross sectional variation in connectivity to test some hypotheses about technology adoption. We find that areas in the South and Midwest have below average connectivity. Connectivity is also related to the living “attractive...
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n engl j med 368;16 nejm.org april 18, 2013 1465 and other health care providers. In particular, the committee was asked whether Medicare should modify payments to adjust for the value of services delivered in a region by using a value index. Such an index would account for both the health benefit obtained from delivered services and their cost. Payment rates would then be raised in areas where...
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ژورنال
عنوان ژورنال: Geographical Analysis
سال: 2010
ISSN: 0016-7363
DOI: 10.1111/j.1538-4632.1975.tb01051.x