Grasslands and Savannas
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منابع مشابه
Comment on "Global resilience of tropical forest and savanna to critical transitions".
Hirota et al. (Reports, 14 October 2011, p. 232) used spatial data to show that grasslands, savannas, and forests represent opposing stable states. Reanalyzing their data and drawing from temporal studies, we argue that spatial analyses underestimate the bistability of grasslands and savannas due to limitations of substituting space for time. We propose that temporal and spatial data are needed...
متن کاملLand use and habitat gradients determine bird community diversity and abundance in suburban, rural and reserve landscapes of Minnesota, USA
Bird species’ community responses to land use in the suburbanizing Twin Cities, Minnesota, USA, were contrasted among reserves, rural lands, and suburbs. For each land use type, bird composition, diversity, and abundance were recorded for 2 years in 99 plots in three sampling units (each 4500 ha). A habitat gradient defined by canopy structure (grasslands to savannas to forests) was influenced ...
متن کاملGrasslands of the World: Diversity, Management and Conservation
Features provide a comprehensive global overview of extent and diversity of grasslands. Analyzes how humans shaped grasslands through millennia of use and which role they play in present-day agriculture. Quantifies the role of grasslands as biodiversity hotspots as well as the drivers threatening these. Evaluates the ecosystem services grasslands provide e.g. in terms of soil protection and car...
متن کاملDistribution of Grasslands in 19 Century Florida
—Presettlement Florida had a variety of open habitats, including grasslands and savannas. This study examined the historic distribution of the Florida grasslands using U.S. General Land Office land surveys made during the 19th century. All survey maps with areas labeled ‘‘prairie’’ or ‘‘savanna’’ were compiled into a composite map. A total of 791,140 ha of prairies and 15,820 ha of savanna were...
متن کاملThe effects of forest-savanna-grassland gradients on bird communities of Chiquitano Dry Forests domain, in western Brazil.
Different vegetation types are distributed in mountains according to altitude, topography and soil. The composition and structure of bird communities in these areas can change in relation to the vegetation gradient, with particular communities occupying each habitat type. In this study we present the changes in composition, species richness and bird abundance over the gradient of forests, savan...
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