منابع مشابه
Geographic Variation in Mixed-Conifer Forest Fire Regimes in California
This paper reviews recent research from California on geographic variability in mixed conifer (MC) forest fire regimes. MC forests are typically described as having experienced primarily frequent, low to moderate severity burns prior to fire suppression that created a mosaic of vegetation patches with variable structure. Research throughout California generally supports this view, but recent re...
متن کاملSpecies Diversity of Trees and Forest Floor Plants in Oriental beech Forest Types of Shastkalate Educational and Research Forest, Gorgan)
Trees are the most important biological elements of forest ecosystems. The variability of the tree species composition inhabiting in the Oriental beech forest, not only forms different forest types but also has a remarkable impact on the species diversity of forest floor plants, due to the existence of trees in the overstory layer. In this research, forest types of an an Oriental beech were ide...
متن کاملElevational Correlates of Speciation and Intraspecific Geographic Variation in Plumage in Andean Forest Birds
ASSTRACT.--Intraspecific variation in plumage was used to test the null hypotheses that geographic variation in 280 species of elevationally restricted Andean forest birds is independent of elevation and is not a function of patchy geographic distribution. Both null hypotheses were rejected. At most taxonomic levels, geographic variation in plumage was correlated positively with both the mean o...
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 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: Silva Fennica
سال: 1980
ISSN: 2242-4075
DOI: 10.14214/sf.a15005