Thryonomys Swinderianus – Greater Cane Rat

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Thryonomys Swinderianus – Greater Cane Rat Thryonomys swinderianus – Greater Cane Rat and because there are no major threats that would cause population decline. It has also become more common in urban areas and is regularly encountered in and on the edge of large cities and towns such as Pretoria, Johannesburg, Welkom and Kroonstad. No conservation interventions are necessary at present. Conversely, its spread along the Vaal and Orange River systems must be monitored as control operations may be necessary if research proves that they exacerbate ecosystem degradation. The consumption of this species as bushmeat or from captive-bred sources implies that it could potentially be utilised sustainably as a source of low- carbon protein for rural communities. Its occurrence in the John Power central Free State today (e.g. around the Welkom mine dams) has been attributed to direct human import as a protein source. Regional Red List status (2016) Least Concern Regional population effects: Limited dispersal possibly National Red List status (2004) Least Concern occurs between Zimbabwe, Mozambique and South Reasons for change No change Africa, especially through Great Limpopo Transfrontier Park. While there are some local movements, the Global Red List status (2016) Least Concern availability of suitable habitat may restrict movement. TOPS listing (NEMBA) (2007) None Within their natural/historical distribution area they are common, but specialized in their habitat requirement; in CITES listing None the Free State they are less common, but their infiltration Endemic No since the early 1980s has followed along a number of rivers. Populations are connected via reed bed-fringed The Greater Cane Rat is not only a rivers. In the Kruger National Park their mapped valuable protein source, but also notorious as a distribution is along all the rivers. This most likely pest species that is slowly expanding its range in continues along the east-flowing rivers into Mozambique. South Africa (van der Merwe & Avenant 2004). There are also suitable habitats that would connect The species gets its name from regularly populations in Mozambique to those in the KwaZulu-Natal inhabiting sugar cane fields and reeds in Province. There is a low likelihood that Zimbabwe can agricultural areas. serve as a source population, as the Limpopo River does not offer suitable habitat for this species. Distribution Taxonomy This species is widely distributed throughout the moister parts of sub-Saharan Africa, avoiding only deserts, dry Thryonomys swinderianus (Temminck 1827) savannahs and the interior of rainforests (Monadjem et al. ANIMALIA - CHORDATA - MAMMALIA - RODENTIA - 2015). However, its distribution is patchy and THRYONOMYIDAE - Thryonomys - swinderianus discontinuous and they only occur where there is suitable habitat (Smithers 1983; van der Merwe & Avenant 2004; Common names: Greater Cane Rat (English), Skinner & Chimimba 2005). Within the assessment region, Grootrietrot, Rietrot (Afrikaans), Tswidi (Sesotho), it occurs from the Grahamstown District in the Eastern Sepoopoo, Letswidi, Lebodi, Tlhêkgê (Setswana), Livondo Cape Province through KwaZulu-Natal, into Mpumalanga, (Swati), Nhleti (Tsonga), Tshedzi (Venda), Ivondwe (Zulu) and then its distribution arcs westwards across the central Taxonomic status: Species parts of the Limpopo and North West provinces (Rautenbach 1978; Skinner & Chimimba 2005; Power Taxonomic notes: No subspecies are currently 2014) and, since the 1980s, also in Gauteng and the Free recognised (Monadjem et al. 2015). State (Figure 1; van der Merwe & Avenant 2004). The species occurs in the Albany Thicket, Savannah, Indian Ocean Coastal Belt and Grassland biomes (Mucina & Assessment Rationale Rutherford 2006), where it is confined to reed beds along Listed as Least Concern because of its wide distribution drainage lines and rivers. within the assessment region, its documented range expansion and continuous expansion into large parts of The western parts of its range are expanding. The most the Free State and North West provinces, its tolerance of westerly records are from the Barberspan area in North habitat modification and ability to thrive in agricultural West Province (Power 2014) and the pans to the west of landscapes, its occurrence in numerous protected areas, Bultfontein in the Free State Province (N.L. Avenant unpubl. data), which is congruent with a general westward Recommended citation: Avenant NL, Power J, MacFadyen D, Child MF. 2016. A conservation assessment of Thryonomys swinderianus. In Child MF, Roxburgh L, Do Linh San E, Raimondo D, Davies-Mostert HT, editors. The Red List of Mammals of South Africa, Swaziland and Lesotho. South African National Biodiversity Institute and Endangered Wildlife Trust, South Africa. The Red List of Mammals of South Africa, Lesotho and Swaziland Thryonomys swinderianus | 1 Figure 1. Distribution records for Greater Cane Rat (Thryonomys swinderianus) within the assessment region Table 1. Countries of occurrence within southern Africa breeding species (van der Merwe & Avenant 2004; Power 2014). Recently, they have been observed in the Leeu and Country Presence Origin Caledon Rivers that flow into the Orange River Botswana Extant Native (N.L. Avenant unpubl. data). Similarly, Greater Cane Rats have recently been observed in the Katse Dam area of Lesotho Extant Introduced Lesotho (du Plessis et al. 2014). Further range expansions Mozambique Extant Native are expected in the assessment region as they do adapt Namibia Extant Native well to cleared areas where food and industrial crops are grown, as well as to secondary savannahs formed as a South Africa – Limpopo Province Extant Native result of forest destruction (Jori et al. 1995). As they are South Africa – Mpumalanga Province Extant Native associated with Phragmites spp. reed beds, they will continue to expand along such river courses; even along South Africa – Gauteng Province Extant Introduced ephemeral rivers in the drier interior where dam walls and South Africa – North West Province Extant Native weirs today support this vegetation throughout the wet South Africa – Free State Province Extant Introduced and dry seasons. South Africa – KwaZulu-Natal Province Extant Native While the presence of this species in Limpopo, Mpumalanga, KwaZulu-Natal and North West provinces South Africa – Eastern Cape Province Extant Native are natural occurrences, its introduction in the interior Swaziland Extant Native (Free State Province) was most probably through either accidental import from KwaZulu-Natal in sugar cane trains, Zimbabwe Extant Native or by people using them as a source of food (van der Merwe & Avenant 2004). This species is regularly observed at Rietvlei Dam and Faerie Glen Nature Reserve range expansion in the central interior. In the Free State, in Pretoria East, and has been observed as road kill in for instance, they have spread rapidly from east to west other parts of Pretoria and Centurion, Gauteng Province, (first record in 1983) over a distance of 400 km within 20 and has also been recorded in the Phragmites spp. reed years, presumably following rivers and a series of pans beds at Telperion Nature Reserve in Mpumalanga that are, during the wet season, connected by dense Province (D. MacFadyen unpubl. data). It has also been grass and Phragmites spp. reed bed vegetation (van der seen at Punda Maria camp and in the vlei at the Merwe & Avenant 2004). While they were once reported N’washitshumbe enclosure site in northern Kruger not to occur in the Vaal and the Orange River systems National Park (D. MacFadyen pers. obs.). As it is also kept (Rautenbach 1982; Lynch 1983; Smithers 1983), they now as a pet (N.L. Avenant unpubl. data), this can also result in are regularly seen there and along its tributaries, as a its introduction and spread. Supporting this, Greater Cane Thryonomys swinderianus | 2 The Red List of Mammals of South Africa, Lesotho and Swaziland Rats have been observed being moved around in small Kruger National Park, its distribution is confined to both cages and kept as a food source in pens like chickens, the perennial and seasonal rivers (Pienaar et al. 1987). It such as around mines in the Welkom area (N.L. Avenant has also become more common in urban areas and is pers. obs.). Similarly, Greater Cane Rats may have been regularly encountered in and on the edge of large cities. brought to the Katse area in Lesotho as a sought after and At more than 4.5 kg, Greater Cane Rats are the second easy-to-breed protein source (du Plessis et al. 2014). largest rodents in Africa. They feed on roots, reeds and Once introduced to the wild, they are thought to benefit the stems of grasses along rivers and in other moist areas. from the reed beds close to man-made weirs and dam Grasses eaten include Couch Grass (Cynodon dactylon), walls as well as the decreased natural predator density Swamp Grass (Hemarthria altissima), Elephant Grass and diversity. (Pennisetum purpureum) and Guinea Grass (Panicum maximum). While grasses are their principal food, they raid Population crops (such as maize, millet, sorghum, wheat, and sugar cane) and cause damage by cutting the stems at their This is an increasingly common species within the base with their broad sharp incisors (Skinner & Chimimba assessment region. It is often abundant in agricultural 2005). lands. For example, in KwaZulu-Natal and Mpumalanga provinces, it can be common in sugar cane fields. It has Greater Cane Rats are predominantly nocturnal or been observed in relatively high numbers in Punda Maria, crepuscular. They
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