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Taï National Park

  • Taï National Park (Parc National de Taï) is a national park in Côte d'Ivoirecontaining one of the last areas of primary rainforest in West Africa. It was inscribed as a World Heritage Site in 1982 due to the breadth of its floraand fauna. Five mammal species of the Taï National Park are on the red list of threatened species: pygmy hippopotamus, olive colobus monkeys,leopards, chimpanzees and Jentink's duiker.

    Taï National Park is approximately 100 km from the Ivoirian coast on the border with Liberia between the Cavally and Sassandra Rivers. It covers an area of 3,300 km² with a 200 km² buffer zone up to 396 m.

    The Tai Forest reserve was created in 1926 and promoted to National Parkstatus in 1972. It was recognised as a UNESCO Biosphere Reserve in 1978 and added to the list of Natural World Heritage Sites in 1982.

    The Tai Forest is a natural reservoir of the Ebola virus. The World Health Organization has expressed concern over the proximity of this reservoir to the International Airport at Abidjan.

     

    The park consists of 4,540 km² of tropical evergreen forest located at the South Western corner of Côte d'Ivoire, borderingLiberia. Altitudes vary from 80m to 396m (Mt. Niénokoué). The Park is situated on a Precambrian Granite Peneplain ofmigmatites, biotites and gneiss which slopes down from the gently undulating drier north to more deeply dissected land in the south where the rainfall is heavy. This plateau at between 150–200 meters is broken by several granite inselbergs formed from plutonic intrusions, including the Mont Niénokoué in the southwest. A large zone of varied schists runs north-east to south-west across the park, dissected by tributaries of the main watercourses which run parallel to it: the N'zo, Meno andLittle Hana and Hana rivers, all draining southwest to the river Cavally. In the wet season these rivers are wide, but in the dry season become shallow streams. The northern border of the adjoining N’Zo Faunal Reserve is formed by the large reservoir behind the Buyo Dam on the N'zo and Sassandra rivers. There is some swamp forest in the northwest of the Park and inN'zo. The soils are ferralitic, generally leached and of low fertility. In the southern valleys there are hydromorphic gley and more fertile alluvial soils (DPN,1998). Gold and some other minerals exist in small quantities.

    There are two distinct climatic zones of sub-equatorial type. Annual rainfall ranges from a mean of 1700 mm in the north to 2200 mm in the southwest, falling from March/April to July, with a shorter wet season in September to October. There is no dry season in the south but in the north it is marked from November to February/March, accentuated briefly by dry northeasterly Harmattan wind. These only began to affect the region about 1970 after half the country’s forests had been felled. There is only a small temperature fluctuation between 24°C to 27°C due to oceanic influence and the presence of forests, but mean diurnal temperatures can range from 25°C to 35°C. The relative humidity is high (85%). The prevailing winds are monsoonal from the south-west. In 1986 Côte d'Ivoire suffered a 30% rainfall deficit, possibly due to loss of forest cover: 90% of the country has been deforested in the past fifty years resulting in greatly diminished evapotranspiration (DPN,1998; Reizebos et al. 1994).

    The Park is one of the last remaining portions of the vast primary Upper Guinean rainforest that once stretched across present-day Togo, Ghana, Côte d'Ivoire, Liberia and Sierra Leone to Guinea-Bissau. It is the largest island of forest remaining in West Africa remaining relatively intact. Its mature tropical forest lies within a WWF/IUCN Centre of Plant Diversity and in the centre of endemism of eastern Liberia and western Côte d'Ivoire, probably as the result of having been an Ice Age refugium, having over 50 species endemic to the region. The Park contains some 1,300 species of higher plants of which 54% occur only in the Guinean zone. The vegetation is predominantly dense evergreen ombrophilous forest of Upper Guinean type of 40–60m emergent trees with massive trunks and large buttresses or stilt roots.

    Two main types of forest can be recognised grading from diverse moist evergreen forest with leguminous trees in the southern third to moist semi-evergreen forest in the north. Large numbers of epiphytes and lianes form an important element at the lower levels including Platycerium, Nephrolepis biserrata, Drymaria and Asplenium africanum. The Sassandrian moist evergreen forest on schistose soils in the south-west is dominated by species such as Ebony (Diospyros gabunensis),Diospyros chevalieri, Mapania baldwinii, Mapania linderi and Tarrietia utilis, with numerous endemic species, especially in the lower Cavally Valley and the Meno and Hana depressions near Mont Niénokoué. The last stands of the large endemic treeKantou guereensis are here. The poorer soils of the north and south-east support species such as palm Eremospatha macrocarpa, west African ebony Diospyros mannii, Diospyros kamerunensis, Parinarii chrysophylla, Chrysophyllum perpulchrum and Chidlowia sanguinea (vi). Species such as Gilbertiodendron splendidum, Symphonia globulifera and Raphiaoccur in the swamp forests of river backwaters and oxbows. The inselbergs are vegetated, according to their substrate, with savanna-like grassland and deciduous trees such as Spathodea campanulata. Plants once thought to be extinct, such asAmorphophallus staudtii, have been discovered in the area. Since commercial timber exploitation officially ceased in 1972, the forest has recovered well, although large areas are dominated by planted species.

    The forest plants still play a large role in the lives of people in the Taï region. The fruit of Thaumatococcus daniellii locally known as katamfe or katempfe, yoruba or soft cane is used in traditional medicine and contains a protein substance five thousand times sweeter than sugar cane. The bark of the Terminalia superba, or "tree of malaria", is used by the ethnicKroumen for the treatment of malaria. This means that the park is an attic of genetic potential not yet explored by natural science and medicine.

    The fauna is fairly typical of West African forests but very diverse, nearly 1,000 vertebrate species being found. The Park contains 140 species of mammal and 47 of the 54 species of large mammal known to occur in the Guinean rain forest, including twelve regional endemics and five threatened species. The region’s isolation between two major rivers has added to its particular character.

     

    Mammals include 11 species of primates: western red colobus (Procolobus badius), Diana monkey (Cercopithecus diana),Campbell's mona monkey (Cercopithecus campbelli), lesser spot-nosed monkey (Cercopithecus petaurista) and greater spot-nosed monkey (Cercopithecus nictitans), black-and-white colobus (Colobus polykomos), ursine colobus (Colobus vellerosus), green colobus (Procolobus verus), sooty mangabey (Cercocebus atys), the dwarf galago (Galago demidovii) andBosman’s potto (Perodicticus potto). There were more than 2,000 West African chimpanzees (Pan troglodytes verus) in the 1980s. In 1995 Marchesi et al. estimated the total number of chimpanzees in Tai to be 4,507, with perhaps 292 in N’Zo and nearby reserves (however there is no doubt that such numbers have declined in the last 15 years). They are noted for using tools (DPN,1998). Further information on the current status of great apes within this park is available at the following linkhttp://apes.eva.mpg.de/apeswiki/index.php/Ta%C3%AF_National_Park .

    Also found are two bats, Buettikofer's epauletted fruit bat (Epomops buettikoferi) and Aellen's roundleaf bat (Hipposideros marisae), Pel's flying squirrel (Anomalurus peli), giant pangolin (Manis gigantea), tree pangolin (Manis tricuspis) and long-tailed pangolin (Manis tetradactyla), Liberian mongoose (Liberiictus kuhni), African golden cat (Profelis aurata), leopard(Panthera pardus), African forest elephant (Loxodonta africana cyclotis), which in 2001 numbered only about 100 individuals in the south of the park compared to some 1,800 in 1979, red river hog (Potamochoerus porcus), giant forest hog(Hylochoerus meinertzhageni ivoriensis), dwarf or pygmy hippopotamus (Hexaprotodon liberiensis) numbered at around 500 in 1996 is one of the few viable populations remaining, water chevrotain (Hyemoschus aquaticus), bongo (Tragelaphus euryceros), African forest buffalo (Syncerus caffer nanus) and an exceptional variety of forest duikers including Jentink's duiker (Cephalophus jentinki), banded or zebra duiker (Cephalophus zebra), Maxwell's duiker (Cephalophus maxwelii),Ogilby's duiker (Cephalophus ogilbyi), black duiker (Cephalophus niger), bay duiker (Cephalophus dorsalis), yellow-backed duiker (Cephalophus sylvicultor) and the royal antelope (Neotragus pygmaeus). Forest rodents include the Rusty-bellied brush-furred rat (Lophuromys sikapusi), the Edward's swamp rat (Malacomys edwardsi) and the woodland dormouse(Graphiurus murinus). Also recorded in the park is Stochomys defua, which is characteristic of secondary forest.

     

    The park lies within one of the world’s Endemic Bird Areas. At least 250 bird species have been recorded, 28 being endemic to the Guinean zone. There are 143 species typical of primary forest, including African crowned eagle (Stephanoaetus coronatus), lesser kestrel (Falco naumanni), white-breasted guineafowl (Agelastes meleagrides), rufous fishing owl(Scotopilia ussheri), brown-cheeked hornbill (Ceratogymna cylindricus), yellow-casqued hornbill (Ceratogymna elata),western wattled cuckooshrike (Campephaga lobata), rufous-winged thrush-babbler (Illadopsis rufescens), green-tailed bristlebill (Bleda eximia), yellow-throated olive greenbul (Criniger olivaceus), black-capped rufous-warbler (Bathmocercus cerviniventris), Nimba flycatcher (Melaenornis annamarulae), Sierra Leone prinia (Prinia leontica), Lagden's bushshrike(Maloconotus lagdeni), copper-tailed glossy-starling (Lamprotornis cupreocauda), white-necked rockfowl (Picathartes gymnocephalus) and Gola malimbe (Malimbus ballmanni) (Fishpool & Evans, 2001). More on birds is given in Thiollay (1985).

     

    Two crocodiles, the slender-snouted crocodile (Crocodylus cataphractus) and the dwarf crocodile (Osteolaemus tetraspis), and several turtles, such as Home's hinge-back tortoise (Kinixys homeana), are amongst about 40 species of reptiles that live in the park. The 53 species of amphibians include the true toad Amietophrynus taiensis, and a tree frog found only in 1997 (Hyperolius nienokouensis).

    Arthropod represent the largest share of biomass in tropical forests. The species include a rare freshwater mollusc Neritina tiassalensis and many thousands of invertebrate species including 57 dragonflies, 95 ants, 44 termites and 78 scarabeid beetles (DPN, 1998).

    The original tribes of the forest region were the Guéré and Oubi, for totemic reasons, did not eat chimpanzees and thus preserved the chimpanzee populations. French influence dated from only the mid 19th century. Evidently, there was little settlement in the area before the late 1960s, when reservoir construction in the N’Zo valley and, later, drought in the Sahel, pushed people southwards. A population in the area of about 3,200 in 1971 had grown to 57,000 twenty years later. The park is now neighbored by 72 villages, and hundreds of illegal squatters live in the Park.

    Of the three main groups of farmers, the rural Bakoué and Kroumen cleared forest selectively, sparing medicinal trees; by contrast, the native Baoulé, and incomers who include refugees displaced by the dam on the N’Zo river, from the Sahel and from the conflicts in both Liberia and Côte d’Ivoire who now form 90% of the population, have indiscriminately fragmented and destroyed much of the forest in the buffer zone. In its place, cash and food crops are planted in shifting cultivation in order to lessen the mortality from malaria. The east side of the park has suffered most from this. These people neither support the park, nor are informed about it by the authorities (DPN, 2002; Gartshore et al.1995).

    The original tribes of the forest region were the Guéré and Oubi, for totemic reasons, did not eat chimpanzees and thus preserved the chimpanzee populations. French influence dated from only the mid 19th century. Evidently, there was little settlement in the area before the late 1960s, when reservoir construction in the N’Zo valley and, later, drought in the Sahel, pushed people southwards. A population in the area of about 3,200 in 1971 had grown to 57,000 twenty years later. The park is now neighbored by 72 villages, and hundreds of illegal squatters live in the Park.

    Of the three main groups of farmers, the rural Bakoué and Kroumen cleared forest selectively, sparing medicinal trees; by contrast, the native Baoulé, and incomers who include refugees displaced by the dam on the N’Zo river, from the Sahel and from the conflicts in both Liberia and Côte d’Ivoire who now form 90% of the population, have indiscriminately fragmented and destroyed much of the forest in the buffer zone. In its place, cash and food crops are planted in shifting cultivation in order to lessen the mortality from malaria. The east side of the park has suffered most from this. These people neither support the park, nor are informed about it by the authorities (DPN, 2002; Gartshoreet al.1995).