COMPARATIVE GEOGRAPHIC VARIATION IN MENIDIA
نویسندگان
چکیده
منابع مشابه
Does Reproductive Investment Decrease Telomere Length in Menidia menidia?
Given finite resources, intense investment in one life history trait is expected to reduce investment in others. Although telomere length appears to be strongly tied to age in many taxa, telomere maintenance requires energy. We therefore hypothesize that telomere maintenance may trade off against other life history characters. We used natural variation in laboratory populations of Atlantic silv...
متن کاملGeographic Variation in Drosophila melanogaster
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...
متن کاملGeographic Variation in Internet Connectivity
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...
متن کاملGeographic variation in Medicare services.
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...
متن کاملThe Evolution of Geographic Variation in Birdsong
Evolutionary biologists have a long‐standing interest in how organisms vary geographically. This interest is motivated in part by recognition of a relationship between geographic variation and the process of speciation. Traits that vary over a given species’ range may serve as neutral, noncontributing indicators of the early stages of divergence, for example as different populations adapt to di...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Evolution
سال: 1974
ISSN: 0014-3820,1558-5646
DOI: 10.1111/j.1558-5646.1974.tb00793.x