Biology:Cabomba caroliniana

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Short description: Species of aquatic plant

Cabomba caroliniana
Cabomba caroliniana leaves.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Family: Cabombaceae
Genus: Cabomba
Species:
C. caroliniana
Binomial name
Cabomba caroliniana
A.Gray

Cabomba caroliniana, commonly known as Carolina fanwort and various other names, is an aquatic perennial herbaceous plant native to North and South America. Having been a popular aquarium plant, it has been exported around the world, and has become an invasive species in Europe and Australia.

Common names

Cabomba caroliniana is commonly called Carolina fanwort,[1] Carolina water shield,[2] green cabomba, fanwort, fish grass, Washington grass, Washington plant, common cabomba, Washington plant, and watershield.[3]

Distribution

It is native to southeastern South America (southern Brazil, Paraguay, Uruguay, and northeastern Argentina),[4] and the East and West Coasts of the United States.[1] It is eaten as a vegetable in some areas.

Description

Submerged leaf of Cabomba caroliniana A.Gray with scale bar (2 cm) on a white background

Fanwort is a submerged, sometimes floating, but often rooted, freshwater perennial plant with short, fragile rhizomes. The erect shoots are upturned extensions of the horizontal rhizomes. The shoots are grass-green to olive-green or sometimes reddish-brown. The leaves are of two types: submerged and floating. The submerged leaves are finely divided and arranged in pairs on the stem. The floating leaves, when present, are linear and inconspicuous, with an alternate arrangement. They are less than 1⁄2 in (13 mm) long and narrow (less than 1⁄4 in or 6.4 mm). The leaf blade attaches to the centre, where a slight constriction is seen. The flowers are white and small (less than 1⁄2 in (13 mm) in diameter) and are on stalks that arise from the tips of the stems.

  • Green and reddish-brown shoots

  • Straplike floating leaves with flowers

  • Finely-divided submerged leaves

  • Submerged leaves protruding above the surface

  • Flowers

  • Infested area in flower (larger round leaves are another species)

Ecological aspects

Large numbers of plants are sent from Florida to the rest of the U.S. for commercial use. Fanwort is also grown commercially in Asia for export to Europe and other parts of the world. Small-scale, local cultivation occurs in some areas, and aquarists are probably responsible for some introductions.[citation needed]

This species grows rooted in the mud of stagnant to slow-flowing water, including streams, smaller rivers, lakes, ponds, sloughs, and ditches. In some states in the United States, it is now regarded as a weed. Fanwort stems become brittle in late summer, which causes the plant to break apart, facilitating its distribution and invasion of new water bodies. It produces by seed, but vegetative reproduction seems to be its main vehicle for spreading to new waters. Growth of 50 mm (2.0 in) a day has been reported in Lake Macdonald in Queensland, Australia.[5]

Use in the aquarium trade has led to some species being introduced to other parts of the world, such as Australia, where Cabomba caroliniana it is a nationally declared weed.[6] Having arrived in 1967, it spread rapidly in waterways and out-competed native plants, threatening water supplies, especially along the eastern side of the continent.[7] It is a weed of national significance in Australia.[8]

It is also on the list of invasive alien species of union concern in the EU.[9] The latter implies that the species cannot be traded nor commercialised. The EU forbids trading and selling of the plant and requires people possessing it before the Regulation went into force to take appropriate measures to prevent it from spreading.[10]

Control measures

(As of July 2023) a trial is under way to control the weed by introducing a tiny South American beetle, Hydrotimetes natans, or Cabomba weevil, into Lake Macdonald and Lake Kurwongbah in Queensland. The species is being bred in a nursery at Lake Kurwongbah, with a view to national introduction for biological control of the weed. The larvae of the weevil damage the plant by tunnelling through its stems, breaking them down and causing secondary infections which hinder their ability to reproduce. Testing has been stringent, and it has been found that only the insect only feeds on cabomba, and does not affect any native plants.[7]

References

  1. ↑ 1.0 1.1 "Cabomba caroliniana". Natural Resources Conservation Service PLANTS Database. USDA. https://plants.usda.gov/core/profile?symbol=CACA. 
  2. ↑ (xls) BSBI List 2007, Botanical Society of Britain and Ireland, https://bsbi.org/download/3542/, retrieved 2014-10-17 
  3. ↑ "Cabomba". 31 December 2021. https://weeds.brisbane.qld.gov.au/weeds/cabomba. 
  4. ↑ Department of Ecology, Washington State: Cabomba caroliniana . Non-Native Invasive Freshwater Plants. Retrieved 16 August 2016
  5. ↑ "Cabomba caroliniana". 4 March 2006. http://www.iucngisd.org/gisd/speciesname/Cabomba+caroliniana. "Principal source: Washington State Department of Ecology, 2003. Technical Information About Cabomba Caroliniana (Fanwort), ERDC, UNDATED Cabomba caroliniana Gray (Fanwort); Compiler: National Biological Information Infrastructure (NBII) & IUCN/SSC Invasive Species Specialist Group (ISSG)" 
  6. ↑ "Cabomba (Cabomba caroliniana)". 24 January 2020. https://weeds.dpi.nsw.gov.au/Weeds/Details/26. 
  7. ↑ 7.0 7.1 Nichols, Jennifer (10 July 2023). "Cabomba weevil unleashed on weed-infesting Australian waterways". https://www.abc.net.au/news/rural/2023-07-10/cabomba-weevil-unleashed-on-weed-infesting-australian-waterways/102482954. 
  8. ↑ "Weeds Australia - Weeds of National Significance". Archived from the original. Error: If you specify |archiveurl=, you must also specify |archivedate=. https://web.archive.org/web/20081017220642/http://www.weeds.org.au/natsig.htm. 
  9. ↑ "Annex to the commission implementing regulation (EU)... adopting a list of invasive alien species of Union concern pursuant to Regulation (EU); No 1143/2014 of the European Parliament and of the Council: List of invasive alien species of Union concern". Archived from the original. Error: If you specify |archiveurl=, you must also specify |archivedate=. https://web.archive.org/web/20160713155109/http://ec.europa.eu/environment/nature/invasivealien/docs/IAS_list_regulation_annex.pdf. 
  10. ↑ "European Regulation IAS". June 2021. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=celex%3A32014R1143. 

Further reading

  • Ørgaard, M. (1991). The genus Cabomba (Cabombaceae) - a taxonomic study. Nordic Journal of Botany 11: 179-203
  • Gleason, H.A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York.
  • Hotchkiss, N. 1972. Common Marsh, Underwater and Floating-leaved Plants of the United States and Canada. Dover Publications, Inc., New York.
  • Radford, A.E., H.E. Ahles, and C.R. Bell. 1968. Vascular Flora of the Carolinas. The University of North Carolina Press, Chapel Hill.
  • Riemer, D.N. and R.D. Ilnicki. 1968. Overwintering of Cabomba in New Jersey. Weed Science 16:101-102.

External links

Wikidata ☰ Q786072 entry



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