West African Region

West African Region

 

(also, the Guinean Region), a tropical zoogeographical region of the ocean.

As a result of the several ice sheets that covered Europe and North America during the Pleistocene epoch, the West African Region experienced an extreme cooling (the temperature of the surface water in the tropical zone of the Atlantic Ocean was 7° lower than it is at present). This cooling caused the region’s flourishing ancient fauna to die out. Northern forms migrated southward through the tropics to the southern hemisphere. The Mediterranean Sea and the western shelf of Africa became populated with boreal and subarctic species. During the postglacial period, the northern forms died out.

The greatly depleted tropical fauna of the West African Region comprises a small number of endemic families and genera. There is only one species of sea cucumbers of the family Rhopalodinidae. There are gastropods of the genus Pusionella, sea urchins of the genus Rotula, and two genera of crabs (Atlantotlos and Ilia). Forty percent of the decapod crayfish and approximately 60 percent of the echinoderms, ascidians, and mollusks are endemic species. Abundant river discharge flow and lengthy rainfall greatly dilute the salt content of the surface water and introduce suspended particles into the water. Therefore, madrepore corals, which flourish in pure seawater, are few in number in the West African Region and do not form reefs. In contrast, the mangrove vegetation forms heavy growths, which are inhabited by unique fauna.

E. F. GUR’IANOVA

References in periodicals archive ?
Summary: Conakry [Guinea], Aug 2 (ANI): President Ram Nath Kovind arrived in Guinea on Thursday on the third leg of his three-nation tour to the West African region.
The Ministers of Labour and Employment in the ECOWAS region, at a meeting in Abuja, have adopted key policy documents on the future of work and decent job for all in the West African region.
The new centre will have a capital of US$20 million (Dhs73.6 million) to help fund a series of special programmes and initiatives aimed towards promoting innovation and SME development in Senegal and the rest of the West African region. The new centre is being developed to help enable a series of projects designed to strengthen the governments efforts to create a stable and balanced economy while also opening job opportunities for the youth, empower women and build the capacity of entrepreneurs and local institutions.
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Commenting on the partnership, Philippe Oliva, Eutelsat's Chief Commercial Officer, said: "After a successful partnership in Mauritania three years ago, we are delighted to be working alongside GLOBAL Technologies once again with assisting WAPP in achieving its ambitious shared energy project in the West African region over the coming months."
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Secondly, the West African region is at the forefront of issues related to population dynamics and development.
Both sides are thrilled to continue this comprehensive China-focused event in the West African region.
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Customers will enjoy seamless connections at the premier gateway to the West African region as a result of this new agreement," said Sean Mendis, chief operations officer for Africa World Airlines.
Specifically designed for SMEs, this will provide a great opportunity for companies looking to expand or enhance their existing reach in the West African region from the local market.
His participation as the most awarded Arab off-road rider, and newly crowned FIM World Bajas reigning champion, was aimed to raise awareness about the sport across the Arab world and to increase competitiveness and engagement among the local riders competing in the North West African region.
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