Aponogeton angustifolius

Taxonomy
Scientific Name
Aponogeton angustifolius Aiton
Higher Classification
Monocotyledons
Family
APONOGETONACEAE
Synonyms
Aponogeton crinifolium Lehm. ex Schltdl.
National Status
Status and Criteria
Vulnerable A2c; B1ab(iii)
Assessment Date
2010/09/10
Assessor(s)
E. Sieben, J.A. Day & D. Raimondo
Justification
EOO 1 816-4 295 km², occurring as isolated subpopulations on the edges of lakes, vleis and in slow-flowing rivers and seasonal streams. Habitat is being continually degraded as a result of changes in flow regimes associated with urban expansion and agriculture. At least 30% of its habitat has been lost in he past 40 years, which is less than three generations (generation length 15 years).
Distribution
Endemism
South African endemic
Provincial distribution
Western Cape
Range
Gouda to Worcester and the Cape Flats.
Habitat and Ecology
Major system
Freshwater
Major habitats
Swartland Alluvium Fynbos, Breede Alluvium Fynbos, Cape Lowland Freshwater Wetlands, Swartland Shale Renosterveld, Peninsula Shale Renosterveld, Swartland Granite Renosterveld, Boland Granite Fynbos, Cape Flats Sand Fynbos, Atlantis Sand Fynbos, Cape Flats Dune Strandveld, Lourensford Alluvium Fynbos
Description
Sandy lake shores that dry out in summer, shallow pools or slowly flowing rivers, in water up to 1m deep.
Threats
Disruption of natural water flow dynamics of wetlands and streams due to agricultural and urban expansion results in drying up of seasonally waterlogged areas and has resulted in an estimated loss of 30% of this species habitat in the past 40 years. The species seems to persist in spite of invasion of its habitat by alien grasses.
Population
Population trend
Decreasing
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Aponogeton angustifolius AitonVU A2c; B1ab(iii)Raimondo et al. (2009)
Bibliography

Cook, C.D.K. 2004. Aquatic and wetland plants of southern Africa. Backhuys Publishers, Leiden, The Netherlands.


Goldblatt, P. and Manning, J.C. 2000. Cape Plants: A conspectus of the Cape Flora of South Africa. Strelitzia 9. National Botanical Institute, Cape Town.


Manning, J.C. and Goldblatt, P. 2012. Plants of the Greater Cape Floristic Region 1: The Core Cape Flora. Strelitzia 29. South African National Biodiversity 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.


Sieben, E.J.J. 2009. The status and distribution of vascular plants (Magnoliophyta, Lycophyta, Pteridophyta). In: W.R.T. Darwall, K.G. Smith, D. Tweddle and P. Skelton (eds.), The status and distribution of freshwater biodiversity in southern Africa (pp. 83-98), IUCN and SAIAB, Gland, Switzerland and Grahamstown, South Africa.


Van Bruggen, H.W.E. 1985. Monograph of the genus Aponogeton (Aponogetonaceae). Bibliotheca Botanica 137:1-76.


Citation
Sieben, E., Day, J.A. & Raimondo, D. 2010. Aponogeton angustifolius Aiton. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2019/06/16

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Distribution map

© G. Laidler

© N.A. Helme

© I. Ebrahim

© I. Ebrahim


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