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| Trichechus senegalensis | |
|---|---|
| Name | Senegalese manatee |
| Status | VU |
| Status system | IUCN3.1 |
| Genus | Trichechus |
| Species | senegalensis |
| Authority | Link, 1795 |
Trichechus senegalensis is the West African manatee, a large aquatic mammal native to coastal and freshwater systems of West Africa. It is a member of the order Sirenia, related to Dugongidae and other Sirenia taxa, and has been the subject of conservation actions involving agencies such as the International Union for Conservation of Nature and the Convention on International Trade in Endangered Species of Wild Fauna and Flora. The species has cultural significance among communities along rivers and coasts, and features in research programs run by institutions such as the Smithsonian Institution, the Wildlife Conservation Society, and regional universities.
Described by Johann Heinrich Friedrich Link in 1795, the species belongs to the family Trichechidae within Sirenia and shares a genus with Trichechus manatus and Trichechus inunguis. Phylogenetic analyses using mitochondrial DNA and nuclear markers have linked sirenians to afrotherian clades including Proboscidea and Hyracoidea in studies by researchers from the University of California, Berkeley, the Natural History Museum, London, and the Max Planck Society. Fossil sirenians such as Prorastomus, Pezosiren, and Protosiren illustrate a transition from terrestrial to fully aquatic lifestyles during the Paleogene, documented by paleontologists at institutions like the American Museum of Natural History and the National Museums of Kenya. Comparative morphology and paleobiogeography work published in journals by teams at Harvard University and the University of Tokyo have refined evolutionary timelines for African sirenians.
Adults typically reach lengths of 2.5–3.5 m and weights of 250–500 kg, with morphological features comparable to other manatees described in monographs from the Royal Society and the Zoological Society of London. The species exhibits a robust, fusiform body, paddle-like flippers, and a horizontally flattened caudal peduncle ending in a rounded tail, traits analyzed in anatomical studies at the Smithsonian Tropical Research Institute and the Field Museum of Natural History. External features include sparse hair, wrinkled skin, and sensory vibrissae concentrated around the prehensile upper lip; histological and sensory research has been conducted by teams at the Max Planck Institute for Evolutionary Anthropology and the University of Miami. Skull and dental adaptations—reduced incisors, procumbent molars—are compared in comparative anatomy collections at the Natural History Museum, Paris and Yale Peabody Museum.
Found along the western coast of Africa from Senegal through the Gulf of Guinea to Angola, populations inhabit estuaries, lagoons, rivers such as the Senegal River, Gambia River, Niger River, and freshwater systems surveyed by organizations like the World Wildlife Fund and the African Wildlife Foundation. Habitats include coastal mangroves, tidal creeks, and freshwater floodplains mapped in studies by the United Nations Environment Programme and the International Union for Conservation of Nature. Records from protected areas such as Niokolo-Koba National Park and marine sites recognized by the Ramsar Convention indicate the species’ reliance on sheltered shallow waters, with distribution shifts monitored by research groups at the University of Lisbon and the University of Cape Town.
Typically solitary or occurring in small aggregations, the species’ social structure and movement patterns have been investigated using telemetry and aerial surveys by teams at the University of Exeter, the University of St Andrews, and the Marine Mammal Commission. Resting, surfacing, and breath-hold behavior documented in field studies by the Duke University Marine Laboratory and the Australian Museum show dives of several minutes and surfacing influenced by tidal cycles governed by oceanographic work from the Scripps Institution of Oceanography. Interactions with sympatric species such as West African crocodile populations and fish assemblages have been a focus for ecologists at the International Union for Conservation of Nature and the African Conservation Centre.
Herbivorous feeding on submerged and emergent vegetation—seagrasses, mangrove-associated flora, and freshwater macrophytes—has been quantified in dietary studies conducted by the University of Aberdeen and the University of Ghent. Foraging strategies include bottom-rooting and cropping of vegetation, with energetics and nutrient intake modeled by researchers at the Massachusetts Institute of Technology and the University of Oxford. The species’ role as an ecosystem engineer, influencing sediment dynamics and plant community structure, is paralleled in work on manatee impacts by scientists at the United States Geological Survey and the Florida Fish and Wildlife Conservation Commission.
Sexual maturity is reached at several years of age, with a low reproductive rate and a typical interbirth interval of 2–5 years; these life-history traits are similar to those reported for related species in studies from the University of Florida and the Curtin University. Gestation lasts about 12 months, and calves nurse for up to two years, as documented by longitudinal fieldwork by the Wildlife Conservation Society and academic teams from the University of Aberdeen. Longevity estimates, based on growth and dentition analyses in museum collections at the Natural History Museum, London and cohort studies by the National Oceanic and Atmospheric Administration, suggest lifespans of several decades under natural conditions.
Listed as Vulnerable by the International Union for Conservation of Nature, the species faces threats from hunting for meat and oil, bycatch in artisanal fisheries, habitat degradation from mangrove clearing, and water pollution—issues addressed in policy forums such as the Convention on Biological Diversity and regional programs run by the African Union and United Nations Development Programme. Conservation measures include protected area designation by national governments, community-based management promoted by NGOs like the World Wildlife Fund and Conservation International, and international agreements such as the Convention on Migratory Species. Research, capacity building, and awareness campaigns conducted by universities and institutions including the Smithsonian Institution and the University of Lagos aim to reduce threats through law enforcement, habitat restoration, and sustainable livelihood initiatives supported by donors like the European Union and the African Development Bank.
Category:Sirenia