نتایج جستجو برای: upper holocene warm period
تعداد نتایج: 713284 فیلتر نتایج به سال:
Recent climate change has triggered profound reorganization in northeast Atlantic ecosystems, with substantial impact on the distribution of marine assemblages from plankton to fishes. However, assessing the repercussions on apex marine predators remains a challenging issue, especially for pelagic species. In this study, we use Bayesian coalescent modelling of microsatellite variation to track ...
Humans have engineered their environments throughout the Holocene, especially in construction of hydraulic infrastructure. In many regions, however, this infrastructure is difficult to date, including vestiges water-management systems Andean highlands. Focusing on silt reservoirs upper Ica drainage, Peru, authors use cores and radiocarbon dates demonstrate pre-Hispanic walls enhance expand wetl...
This paper deals with the study of Holocene geomorphic evolution of rivers around Songshan Mountain in relation to human frequentation in Prehistoric periods. The investigations were performed by means of an integration of GIS data processing; field surveys and particle size analysis. In 8000–3000 aBP; in the Songshan Mountain Region, large-scale river sedimentation occurred. This increased the...
Hominid evolution can be interpreted either as a series of speciation events producing new morphological patterns or as an anagenetic process in a single-taxon lineage resulting in gradual changes of morphological characters. Studies of changes of metric characteristics of humans during the Holocene indicate that a substantial change in morphology can occur within a few thousand years. Reductio...
To compare the effects of two free radical scavengers, dimethylsulfoxide 50% (DMSO) and N-acetylcysteine (NAC), for treatment of complex regional pain syndrome I (CRPS I), a randomized, double-dummy controlled, double-blind trial was conducted. Two outpatient clinics of two university hospitals in The Netherlands participated in the study and 146 patients, were included over a period of 24 mont...
Extreme climatic events have profound impacts on human society. Here we present the results of a study of organic biomarkers within a sedimentary section at the archaeological site of Yuchisi, eastern China, in order to reconstruct climatic variability during the Dawenkou (5,050-4,400 yr BP) and Longshan (4,400-4,000 yr BP) cultures. At ~4,400 yr BP, within the cultural transition horizon, abru...
During the past two decades an array of studies have shed light on potential links between the evolution of Hominids as well as Human dispersal out of Africa and episodes of abrupt climate change. Although archaeological evidences suggest that anatomically modified humans appeared in Africa between 200 and 150 ky ago, the timing of the early humans migration out of Africa remained unclear. Stra...
Geophysical mapping and sampling data provide a record of changing environmental and faunal conditions within the Hudson River estuary during the midto late Holocene. On the shallow, broad marginal flats of the mesohaline Hudson, fossil oyster beds (Crassostrea virginica) are found exposed on the river bottom and buried by sediment. The shallowest beds are well imaged in chirp sub-bottom and si...
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