Distribution, Status, and Biology of the Atlantic Humpback Dolphin, &lt;I&gt;Sousa teuszii &lt;/I&gt; (Kükenthal, 1892)

Waerebeek, Koen Van; Barnett, Linda; Camara, A.; Cham, Anna Mbenga; Diallo, M.; Djiba, A.; Jallow, Amadou T.; Ndiaye, E.; Bilal, Abdellahi Samba Ould; Bamy, Idrissa L.

doi:10.1578/am.30.1.2004.56

Cited by 53 publications

(108 citation statements)

References 17 publications

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“…M. monachus is found off the Cape Blanc Peninsula, although it has also been observed to travel several miles offshore to obtain its prey (Gazo & Aguilar 2005). Despite the similarity in the δ 13 C values of M. monachus and S. teuszii, the former was far more enriched for δ 15 N. This result is also consistent with stomachcontent analysis, as S. teuszii consumes primarily detritivorus and zooplanktophagous fish that are abundant nearshore (Cadenat & Paraíso 1957, Van Waerebeek et al 2004, whereas M. monachus principally eats lobsters, octopus and benthic, carnivorous fish (Marchessaux 1989). However, increasing fish landings have resulted in stocks, especially those of demersal fish and invertebrates (crustaceans and cephalopods), being overexploited or severely depleted (Christensen et al 2004, Jouffre & Inejih 2005, most likely affecting the feeding behaviour of M. monachus and S. teuszii.…”

Section: Discussionsupporting

confidence: 56%

“…The main area of occurrence of S. teuszii is the Banc d'Arguin, a large system of shallow waters and channels extending along the northern coast of the country (Maigret et al 1976, Maigret 1980a, Van Waerebeek et al 2004. M. monachus is found off the Cape Blanc Peninsula, although it has also been observed to travel several miles offshore to obtain its prey (Gazo & Aguilar 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Mar Ecol Prog Ser 416: [295][296][297][298][299][300][301][302][303][304][305][306] 2010 cies, such as the Mediterranean monk seal Monachus monachus (González et al 1997), the Atlantic humpback dolphin Sousa teuszii (Van Waerebeek et al 2004) and the African manatee Trichechus senegalensis (Padial & Ibáñez 2005). Mauritania is one of the major African fishing nations and has developed, alongside traditional artisanal fishing, industrial fisheries, becoming one of the major fish exporting African countries (Ababouch 2000).…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

“…Such productivity supports a highly diverse and abundant fauna of marine mammals, (Marchessaux & Campredon 1988, Robineau & Vely 1998, Nieri et al 1999) which typically include, given the mix of waters, boreal species as well as tropical or subtropical species (Robineau & Vely 1998). Additionally, the region shelters the last remnant populations of some scarce or highly endangered spe-cies, such as the Mediterranean monk seal Monachus monachus (González et al 1997), the Atlantic humpback dolphin Sousa teuszii (Van Waerebeek et al 2004) and the African manatee Trichechus senegalensis (Padial & Ibáñez 2005). Mauritania is one of the major African fishing nations and has developed, alongside traditional artisanal fishing, industrial fisheries, becoming one of the major fish exporting African countries (Ababouch 2000).…”

Section: Introductionmentioning

confidence: 99%

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Stable isotope analysis reveals habitat partitioning among marine mammals off the NW African coast and unique trophic niches for two globally threatened species

Pinela¹,

Borrell²,

Cardona³

et al. 2010

Mar. Ecol. Prog. Ser.

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Stable isotope abundances of carbon (δ 13 C) and nitrogen (δ 15 N) in the bone of 13 species of marine mammals from the northwest coast of Africa were investigated to assess their positions in the local trophic web and their preferred habitats. Also, samples of primary producers and potential prey species from the study area were collected to characterise the local isotopic landscape. This characterisation indicated that δ 13 C values increased from offshore to nearshore and that δ 15 N was a good proxy for trophic level. Therefore, the most coastal species were Monachus monachus and Sousa teuszii, whereas the most pelagic were Physeter macrocephalus and Balaenoptera acutorostrata. δ 15 N values indicated that marine mammals located at the lowest trophic level were B. acutorostrata, Stenella coeruleoalba and Delphinus sp., and those occupying the highest trophic level were M. monachus and P. macrocephalus. The trophic level of Orcinus orca was similar to that of M. monachus, suggesting that O. orca preys on fish. Conservation of coastal and threatened species (M. monachus and S. teuszii ) off NW Africa should be a priority because these species, as the main apex predators, cannot be replaced by other marine mammals. KEY WORDS: Marine mammals · Stable isotopes · Trophic ecology · Habitat use · NW Africa Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 416: [295][296][297][298][299][300][301][302][303][304][305][306] 2010 cies, such as the Mediterranean monk seal Monachus monachus (González et al. 1997), the Atlantic humpback dolphin Sousa teuszii (Van Waerebeek et al. 2004) and the African manatee Trichechus senegalensis (Padial & Ibáñez 2005). Mauritania is one of the major African fishing nations and has developed, alongside traditional artisanal fishing, industrial fisheries, becoming one of the major fish exporting African countries (Ababouch 2000). Overfishing, overcapacity, habitat degradation and inequitable access agreements have contributed to the decline in catches throughout West Africa (Atta-Mills et al. 2004, ter Hofstede & DickeyCollas 2006. Assessing the impact of fisheries on the local ecosystem is of great interest (Jouffre & Inejih 2005) but no studies have been conducted involving marine mammals.Available information on the marine mammals of the region is limited to stranding and sighting reports in the case of cetaceans (Duguy 1976, Maigret 1980a,b, 1981, Marchessaux & Campredon 1988, Van Waerebeek et al. 1999, although a few demographic parameters are known for Monachus monachus (González et al. 1997. Nevertheless, the trophic relationships among the marine apex predators of the region have never been investigated, and their possible interactions with the fisheries operating in the area are largely unknown.The methods traditionally used in the study of the trophic ecology of marine mammals have been faecal or stomach-content analyses. These methods present limitations because they only show recently eaten prey, and results can be se...

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Section: Discussionsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stable isotope analysis reveals habitat partitioning among marine mammals off the NW African coast and unique trophic niches for two globally threatened species

Pinela¹,

Borrell²,

Cardona³

et al. 2010

Mar. Ecol. Prog. Ser.

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“…Nonetheless, because of both direct and circumstantial evidence of by-catches and since estimated numbers of the stocks for which some estimate was available have invariably been low, i.e. tens or hundreds of individuals (Collins et al, 2004;Van Waerebeek et al, 2004;Weir, 2009Weir, , 2010, concern is expressed about removals of any level. The Konkouré Estuary is protected since 1992 as a Ramsar wetlands site (No.…”

Section: Discussionmentioning

confidence: 99%

Species occurrence of cetaceans in Guinea, including humpback whales with southern hemisphere seasonality

Bamy¹,

Waerebeek

Bah³

et al. 2010

Mar. Biodivers. Rec.

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An initial inventory of the dolphins and whales occurring in Guinea's coastal waters is documented primarily from specimens and photographic evidence obtained from strandings and by-catches. Seven species are fully validated, four odontocetes, Tursiops truncatus, Sousa teuszii, Stenella frontalis, Kogia breviceps and three balaenopterid whales: Balaenoptera brydei, Balaenoptera acutorostrata and Megaptera novaeangliae. Another three reported species (Globicephala macrorhynchus, Steno bredanensis and Delphinus delphis) are insufficiently supported but thought to be valid. Small cetaceans landed as by-catch and a stranded whale were used for human consumption, but no evidence of substantial takes, directed or by-catch, was found. However, concern is raised about even minimal takes of the vulnerable Atlantic humpback dolphin. The seasonal presence of three confirmed humpback whales, two strandings (July and September) and a sighting (October), is synchronous with the species' southern hemisphere wintering/breeding season in low latitudes. We hypothesize that these whales may comprise the north-westernmost range of the population that breeds/overwinters in coastal waters of the Bight of Benin, northern Gulf of Guinea.

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The status of marine biodiversity in the Eastern Central Atlantic (West and Central Africa)

Polidoro

Ralph

Strongin

et al. 2017

Aquatic Conservation

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International audience* The status of marine biodiversity in the Eastern Central Atlantic (ECA), especially of coastal and pelagic fishes, is of concern owing to a number of threats including overharvesting, habitat loss, pollution, and climate change combined with inadequate policy responses, legislation, and enforcement.ăă* This study provides the first comprehensive documentation of the presence, status, and level of extinction risk, based on IUCN Red List assessment methodology, for more than 1800 marine species, including all taxonomically described marine vertebrates (marine mammals, sea turtles, seabirds, fishes); complete clades of selected marine invertebrates (sea cucumbers, cone snails, cephalopods, lobsters, reef-building corals); and marine plants (mangroves, seagrasses).ăă* Approximately 8% of all marine species assessed in the ECA are in threatened categories, while 4% are listed as Near Threatened, 73% are Least Concern, and 15% are Data Deficient. Fisheries and overharvesting are the biggest threats to living marine resources in the ECA, with 87% of threatened species across all taxonomic groups affected by both large- and small-scale targeted fisheries, excessive capture as by-catch, or unsustainable harvest.ăă* The results of this study will transform the current state of knowledge and increase capacity for regional stakeholders to identify and enact marine conservation and research priorities, as a number of species are identified as having high conservation and/or research priorities in the region.ăă* Through the process of marine species data collection and risk assessments conducted over the past 5 years, several key conservation actions and research needs are identified to enable more effective conservation of marine biodiversity in the ECA, including increased governance, multilateral collaboration, taxonomic training, and improved reporting of fisheries catch and effort

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Distribution, Status, and Biology of the Atlantic Humpback Dolphin, <I>Sousa teuszii </I> (Kükenthal, 1892)

Cited by 53 publications

References 17 publications

Stable isotope analysis reveals habitat partitioning among marine mammals off the NW African coast and unique trophic niches for two globally threatened species

Stable isotope analysis reveals habitat partitioning among marine mammals off the NW African coast and unique trophic niches for two globally threatened species

Species occurrence of cetaceans in Guinea, including humpback whales with southern hemisphere seasonality

The status of marine biodiversity in the Eastern Central Atlantic (West and Central Africa)

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