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Sousa taxonomy is based largely on small sample sizes for most populations. The several different nominal species are distinguished on several primary characters. Characters include tooth counts; number of vertebrae; form of the dorsal fin base and especially colour patterns (G. Ross, pers. comm.). G. Ross suggests that all Sousa from S. Africa to China and Australia are one species, and probably S. teuszii is also conspecific. However, "we will have a better idea when we can include more definitive genetic work" (G. Ross, pers. comm.). For the purpose of this review, I followed Rice (1998) who separates the Genus Sousa into three species.
According to Carwardine (1995) this species seems to be particularly common in southern Senegal and northwestern Mauritania.
There are signs of a probable north-south migration for this species and there is a potential exchange of individuals between known population or subpopulation distribution centres (from north to south): Dakhla Bay, Banc d'Arguin, Langue de Barbarie, Sine Saloum delta, NW bank of the Gambia River outer estuary and Guinea-Bissau archipelago (van Waerebeek et el. 2000).
Written Jan 17, 2004
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The Banc d'Arguin is a crossroads for aquatic birds migrating between Europe, northern Asia and Africa. Over two million sandpipers have been recorded in the winter, and many species use the national park for breeding also. The sea is crystal clear and shallow (no more than about 3m (10ft) deep 25km (15mi) from shore) and is dotted with sand islands where the birds nest and rest. The only way to see the birds is from small boats, and then only with permission from the national parks service, and a guide. Visitor times are strictly regulated - you are not allowed get close to the birds during the twice-yearly mating season - so plan ahead. A 4WD is required and the trip involves a 155km (96mi) drive along the beach - knowledge of tides is essential - then another 50km (31mi) through desert. Bring your own boat. Arguin Bank is about 250km (155mi) from both Nouakchott and Nouâdhibou, but even more difficult to access from the north.
Written Jan 17, 2004
all the way getting out from the village this is the kind of landscape you have for at least 150 km.
Written Jan 17, 2004
on the north entrance of the city near the guard offices.
Written Jan 17, 2004
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offices in Nouamghar north entrance.
you have either to give your entrance ticket to the guard or to buy one.
Written Jan 17, 2004
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offices in Nouamghar north entrance.you have either to give your entrance ticket to the guard or to buy one.
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Nouamghar is a special kind of fishing village. Here the Imragen use strange techniques to catch fish. They strike the water with wooden sticks and then the doplhins come closer to the coast, driving...
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