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 ?
Through our vibrant local partner ecosystem and dedicated team of highly skilled and experienced employees, based here in Accra and throughout the greater West African Region, we provide customers with high-value products and services, and work to build lasting relationships through day-to-day engagements.
Erdogan had landed in Guinea as part of his four-nation trip to the West African region, Guinea being the last destination in the itinerary.
Ghana is a key market in the West African region and has raw materials that can be exploited in partnerships between the two countries, he explained, and called on Jordanian business leaders to discover his country's potential investment opportunities.
Noting that the Bank had made Nigeria the first regional member country to host a purpose built and Bank-owned office complex, she said the complex would boost Nigeria's efforts and plans for regional integration in the West African Region.
5billion and sited within the Lagos Free Trade Zone (LFTZ), is expected to be one of the most advanced ports, supporting the rapidly growing trade across Nigeria and the whole West African region as well as providing the connection to global shipping network.
He points to other countries in the West African region like Cote d'Ivoire and Ghana where he says it would soon be observed that permitting people of other races to become citizens has not marginalized their indigenes.
One of them said more than 75 children in the age group 5-16 were rescued by authorities in the West African region where police arrested no less than 25 people who were involved in their trafficking.
ECOWAS has 15 member states in the West African region whose global economic and demographic weight is very important, thanks to a GDP of $ 630 billion and a market of more than 300 million inhabitants, which is about quarter of the population of the African continent.
The obvious culprits to point to for these low numbers are poaching, habitat destruction and the general effects of climate change on the West African region.
This latest endeavour is part of the fund's tailored energy portfolio for the West African region.
Given the impact of Ebola on the West African region as a whole and the lack of investment appetite from traditional finance sources, the board have formed the view at this time, after due investigations and careful consideration, that the company is unlikely to be able to raise the finance to continue with the development of the cocoa plantation in the foreseeable future.
Pockets of disagreement persist from Tanzania in the East African region and Nigeria, The Gambia and Mauritania in the West African region.
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