IUCN threat status:

Data Deficient (DD)

Distribution

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Range Description

The two disjunct subspecies are separated by 130° of longitude and about 8,500 km.

C. c. commersonii - Falkland Islands / Islas Malvinas and the coastal waters of southern South America. On the Atlantic coast the northern limit is at approximately River Negro mouth (40°S) (Bastida and Rodríguez 2003). The range extends south near Cape Horn (56ºS) including the central and eastern Strait of Magellan and the Falkland (Malvinas) Islands (Goodall 1978, Goodall et al. 1988). Single dolphins and groups of up to hundreds were sighted in the late 1980s and early 1990s along the northern coast of Tierra del Fuego (Goodall 1994). Although sightings in the northern parts of the range often are of small groups or solitary individuals, overall numbers and group sizes increase to the south. In Chile the species is found: Strait of Magellan (Aguayo-Lobo 1975, Goodall 1978, Venegas and Sielfeld 1978, Sielfeld 1983, Venegas and Atalah 1987, Thielke 1984, Goodall et al. 1988, Leatherwood et al. 1988, Hucke-Gaete and Vallejos 1997, Aguayo-Lobo et al. 1998, Gibbons et al. 2000), Seno Skyring, Fitz Roy channel, seno Otway and seno Almirantazgo (Sielfeld and Venegas 1978, Gibbons et al. 2000). Genetic population structure revealed significant differentiation among different studied areas (within Tierra del Fuego and Santa Cruz provinces) over small geographic scales, considering these as subpopulations (Pimper et al. 2010, Cipriano et al. 2011).Two “ecological stocks” have been identified based on differences in parasite loads and patterns of prey consumption (Berón-Vera et al. 2001).

C. c. kerguelenensis - Shallow coastal waters around all of the Îles Kerguélen in the southern Indian Ocean (Rice 1998; Robineau et al. 2007). No sightings or specimens have yet been reported from islands between South America and Kerguélen, such as Crozet, Heard, Amsterdam or St Paul (Goodall 1994). Dolphins of the Kerguelen Islands subspecies are most commonly sighted in the Golfe du Morbihan, on the eastern side of Kerguélen. Reported vagrants (northernmost records) in the coast of South America. Buenos Aires province, Argentina (Brownell and Praderi 1985, Iñiguez et al. 2010), Chile (Capella and Gibbons 1991), Brazil (Pinedo et al. 2002).
Recently, a sighting of a single individual south of Cape Town, in South African waters, was reported, although this should be considered extralimital (de Bruyns et al. 2006). There are also unsubstantiated reports of this species at South Georgia, but these have been rejected (Brown 1988).

The map shows where the species may occur based on oceanography. The species has not been recorded for all the states within the hypothetical range as shown on the map. States for which confirmed records of the species exist are included in the list of native range states.

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© International Union for Conservation of Nature and Natural Resources

Source: IUCN

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