Eriosema umtamvunense

Taxonomy
Scientific Name
Eriosema umtamvunense C.H.Stirt.
Higher Classification
Dicotyledons
Family
FABACEAE
National Status
Status and Criteria
Endangered A2c
Assessment Date
2014/08/08
Assessor(s)
L. von Staden
Justification
At least a 50% population reduction is inferred from the rate of rapid, ongoing habitat loss within the last three generations of this long-lived, suffrutescent grassland forb (generation length 30-50 years).
Distribution
Endemism
South African endemic
Provincial distribution
Eastern Cape, KwaZulu-Natal
Range
KwaZulu-Natal south coast, from Margate to the Mzamba River, in the Eastern Cape south of Port Edward.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Pondoland-Ugu Sandstone Coastal Sourveld, KwaZulu-Natal Coastal Belt Grassland
Description
Pondoland coastal grasslands, Msikaba Formation Sandstone, 50-600 m.
Threats
About 60% of the grasslands within the known range of this locally common, long-lived suffrutescent grassland forb is already irreversibly modified, as a result of expanding cultivation of sugarcane, bananas and macadamia nuts, as well as forestry plantations and the urban expansion on the coast between Port Edward and Margate. Grasslands are continuously being rapidly lost and degraded, predominantly due to a significant increase in the extent of densely populated rural settlements and associated subsistence agriculture, as well as coastal development, over the past 20 years. Remaining grasslands outside protected areas are also subjected to overgrazing and inappropriate fire management.
Population

Eriosema umtamvunense is locally common in suitable habitat, however, the population has become fragmented due to extensive habitat loss. Recent survey data indicates that this species is more widespread than previously known, although the range is still very restricted. By the 1990s, it had already lost at least 40% of its habitat, and a comparison of recent and historic land cover data indicates that loss is continuing rapidly, with another 30% lost within 15 years, and less than 40% of this species' original habitat now remains intact. It is a long-lived, slow growing, resprouting forb (generation length estimated 30-50 years), and from the rapid rate of habitat loss a population reduction of at least 50% over the past three generations is inferred.


Population trend
Decreasing
Conservation
Umtamvuna Nature Reserve.
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Eriosema umtamvunense C.H.Stirt.EN A2c2015.1
Eriosema umtamvunense C.H.Stirt.VU A2cRaimondo et al. (2009)
Eriosema umtamvunense C.H.Stirt.Lower Risk - Near Threatened Scott-Shaw (1999)
Eriosema umtamvunense C.H.Stirt.Rare Hilton-Taylor (1996)
Bibliography

Abbott, A., Van Wyk, A.E., Johnson, D.N. and Scott-Shaw, C.R. 2000. Checklist of the macrofungi, lichens, bryophytes and vascular plants of the Umtamvuna Nature Reserve, South Africa. Lammergeyer 46:1-69.


Hilton-Taylor, C. 1996. Red data list of southern African plants. Strelitzia 4. South African National Botanical Institute, Pretoria.


Raimondo, D., von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. and Manyama, P.A. 2009. Red List of South African Plants. Strelitzia 25. South African National Biodiversity Institute, Pretoria.


Scott-Shaw, C.R. 1999. Rare and threatened plants of KwaZulu-Natal and neighbouring regions. KwaZulu-Natal Nature Conservation Service, Pietermaritzburg.


Stirton, C.H. 1986. The Eriosema squarrosum complex (Papilionoideae, Fabaceae) in southern Africa. Bothalia 16(1):11-22.


Citation
von Staden, L. 2014. Eriosema umtamvunense C.H.Stirt. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2019/03/21

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Distribution map

© A.T.D. Abbott

© A.T.D. Abbott

© A.T.D. Abbott


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