نتایج جستجو برای: sahel
تعداد نتایج: 1478 فیلتر نتایج به سال:
The G5 Sahel works in collaboration with various international organizations and countries, which are responsible for managing logistics activities, financial flows, technological solutions. Humanitarian assistance holds a critically important role the region, despite its multiple challenges limitations macroeconomic development. This research aimed to examine macrologistics potential of humani...
Every year, hundreds of millions migratory birds cross the Sahara to spend northern winter in Sahel. After their arrival September region does not receive any rainfall until June while temperatures increase. Birds inhabiting Sahel have several strategies cope with this seasonal advent drought. Most ground-foraging and arboreal migrants actually remain desiccating Sahel, although Northern Wheate...
The carbon isotopic composition of individual plant leaf waxes (a proxy for C(3) vs. C(4) vegetation) in a marine sediment core collected from beneath the plume of Sahara-derived dust in northwest Africa reveals three periods during the past 192,000 years when the central Sahara/Sahel contained C(3) plants (likely trees), indicating substantially wetter conditions than at present. Our data sugg...
Frequent Agonistic Interactions among Arboreal Birds in Savannahs But Not in Humid Forests of Africa
Arboreal birds in the Sahel are highly selective their tree choice. Most migrant, but also resident, found a few species and within those often only trees with abundant leaves flowers. For this reason alone, preferred were expected to teem birds. This was not case. bird present as singletons, even half of Senegal Eremomela pusilla – most social all recorded solitary The probability that two dif...
Abstract. African mineral dust is transported many thousands of kilometres from its source regions, and, because ability to nucleate ice, it plays a major role in cloud glaciation around the globe. The ice-nucleating activity desert influenced by mineralogy, which varies substantially between regions and across particle sizes. However, models often assumed that (expressed as active sites per un...
Despite the long-lasting and widespread drought in Sahel, flood events did punctuate past. The concern about floods remains dwarf on international research policy agenda compared to droughts. In this paper, we elucidate that Sahel are now becoming more frequent, widespread, devastating. We analyzed gridded daily rainfall data over period 1981–2020, used photographs satellite images depict areas...
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