9 research outputs found
Motherhood in childhood: addressing reproductive health hazards among adolescent married women in India
Biome changes and their inferred climatic drivers in northern and eastern continental Asia at selected times since 40 cal ka bp
Recent global warming is pronounced in high-latitude regions (e.g. northern Asia), and will cause the vegetation to change.
Future vegetation trends (e.g. the âarctic greeningâ) will feed back into atmospheric circulation and the global climate system. Understanding the nature and causes of past vegetation changes is important for predicting the composition and distribution of future vegetation communities. Fossil pollen records from 468 sites in northern and eastern Asia were biomised at selected times between 40Â cal ka bp and today. Biomes were also simulated using a climate-driven biome model and results from the two approaches compared in order to help understand the mechanisms behind the observed vegetation changes. The consistent biome results inferred by both approaches reveal that long-term and broad-scale vegetation patterns reflect global to hemispheric-scale climate changes. Forest biomes increase around the beginning of the late deglaciation, become more widespread during the early and middle Holocene, and decrease in the late Holocene in fringe areas of the Asian Summer Monsoon. At the southern and southwestern margins of the taiga, forest increases in the early Holocene and shows notable species succession, which may have been caused by winter warming at ca. 7Â cal ka bp. At the northeastern taiga margin (central Yakutia and northeastern Siberia), shrub expansion during the last deglaciation appears to prevent the permafrost from thawing and hinders the northward expansion of evergreen needle-leaved species until ca. 7Â cal ka bp. The vegetation climate disequilibrium during the early Holocene in the taiga-tundra transition zone suggests that projected climate warming will not cause a northward expansion of evergreen needle-leaved species
Pregnancy loss managed by cervical dilatation and curettage increases the risk of spontaneous preterm birth
Biome changes and their inferred climatic drivers in northern and eastern continental Asia at selected times since 40Â cal ka bp
The North Atlantic turbine: Views of production processes from a mainly North Atlantic perspective
13 pĂĄginasA brief account is given of the âagricultural hypothesisâ, the key studies which led to its replacement by the âgrazing hypothesisâ, and early models of the classical planktonic food chain. The budgetary problems posed by these views led to interest in the roles of dissolved and particulate components of planktonic ecosystems, and to discovery of the âmicrobial loopâ. The balance between these alternative pathways is seen to reflect processes at the interface between hydrodynamics and ecologyPeer reviewe