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   Crassula helmsii (aquatic plant, succulent)
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    37 references found for Crassula helmsii:
    Management information

    1. Berwick, Holly. 2009. Crassula helmsii at Lound Lakes Management Options. Broads Authority - The broads, a member of the National Park family. Essex and Suffolk Water.
      Summary: Available from: http://ias.biodiversity.be/ias/species/show/50 [Accessed 18 November 2009]
      Summary: Available from: http://www.eppo.org/QUARANTINE/plants/Crassula_helmsii/Crassula_helmsii_DS.pdf [Accessed 18 November 2009]
      Summary: Available from: http://www.nerc-wallingford.ac.uk/research/capm/pdf%20files/12%20Crassula.pdf [Accessed 18 November 2009]

    5. Dawson, F. H. 1996. Crassula helmsii: Attempts at elimination using herbicides. Hydrobiologia. 340(1-3). 1996. 241-245.
      Summary: Available from: http://eppo.org/QUARANTINE/Action_List/Action_List_documents/plants/06-12801_PRArep_CSBHE.doc [Accessed 18 November 2009]
      Summary: Available from: http://www.eppo.org/QUARANTINE/Alert_List/deleted%20files/weeds/Crassula_helmsii.doc [Accessed 18 November 2009]

    8. Gassmann, Andre, Cock, Matthew J. W., Shaw, Richard, Evans, Harry C. 2006. The potential for biological control of invasive alien aquatic weeds in Europe: a review. Hydrobiologia. 570 OCT 15 2006. 217-222.
      Summary: Available from: http://www.conservationevidence.com/Attachments/PDF142.pdf [Accessed 18 November 2009]
      Summary: Available from: http://www.invasivespeciesireland.com/files/public/Management%20contingency/Crassula%20helmsii%20Invasive%20Species%20Action%20Plan.pdf [Accessed 18 November 2009]

    11. Linton, S & R. Goulder., 2000. Botanical conservation Value related to origin and management of ponds Aquatic Conser 6: Mar. Freshw. Ecosyst. 10: 77–91 (2000)

    12. Manchester Sarah, J & James M. Bullock, 2000. The impacts of non-native species on UK biodiversity and the effectiveness of control. Journal of Applied Ecology 2000, 37, 845±864
      Summary: Available from: http://www.snh.org.uk/speciesactionframework/saf-nzpygmyweed.asp [Accessed 18 November 2009]

    14. Sheppard, A.W.; R.H. Shaw & R. Sforza., 2005. Top 20 environmental weeds for classical biological control in Europe: a review of opportunities, regulations and other barriers to adoption. Weed Research 2006 46, 93–117
      Summary: Available from: http://plants.usda.gov/java/profile?symbol=CRHE5 [Accessed 18 November 2009]
      Summary: Available from: http://www.ria.ie/cgi-bin/ria/papers/100500.pdf [Accessed 18 November 2009]

    17. Wilton-Jones, G. 2005. Control of New Zealand pygmyweed Crassula helmsii by covering with black polythene at The Lodge RSPB Reserve, Bedfordshire, England. Conservation Evidence (2005) 2, 63

    General references

    18. Dawson, F.H., Warman, E.A. 1987. Crassula helmsii (T. Kirk) cockayne: Is it an aggressive alien aquatic plant in Britain?. Biological Conservation 42 (4), pp. 247-272.
      Summary: Available from: http://www.europe-aliens.org/speciesFactsheet.do?speciesId=8738 [Accessed 18 November 2009]
      Summary: Available from: http://www.eppo.org/QUARANTINE/plants/Crassula_helmsii/Crassula_helmsii_DS.pdf [Accessed 18 November 2009]

    21. European and Mediterranean Plant Protection Organization (EPPO), 2007. Data sheets on quarantine pests: Crassula helmsii. Bulletin OEPP/EPPO Bulletin 37, 225–229
      Summary: Available from: http://www.habitas.org.uk/flora/species.asp?item=4639 [Accessed 18 November 2009]
      Summary: Available from: http://www.hear.org/gcw/species/crassula_helmsii/ [Accessed 18 November 2009]
      Summary: Available from: http://www.aquaticinvasions.ru/2006/AI_2006_1_4_Gollasch_Nehring.pdf [Accessed 18 November 2009]

    25. Hussner, A. 2009. Growth and photosynthesis of four invasive aquatic plant species in Europe. Weed Research (Oxford). 49(5). OCT 2009. 506-515.
      Summary: Available from: http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=565979 [Accessed 18 November 2009]

    27. James, P. 1995. Changing roles of a wildlife reserve in response to increasing visitor pressure and invasion by Crassula helmsii. Journal of Practical Ecology & Conservation 1 (1), pp. 41-45.
      Summary: During 1986/7, a range of habitats, including a 1 ha lagoon, were created to form a 10.5 ha wildlife reserve at Broad Ees Dole, Manchester. In 1992, C. helmsii was found infesting both the 1 ha lagoon and a smaller 5 m pond. Historical records, interviews and direct observations were used to investigate perceived and actual changes in the reserve. The invasion of C. helmsii into this "show case' reserve has had impacts on avian and human visitors, and emphasis is given to the needs of non-specialist visitors. -from Author

    28. Klavsen, Signe Koch and Maberly, Stephen C. 2009. Crassulacean acid metabolism contributes significantly to the in situ carbon budget in a population of the invasive aquatic macrophyte Crassula helmsii. Freshwater Biology. 54(1). JAN 2009. 105-118.

    29. Kuepper, Frithjof, Kuepper, Hendrik, Spiller, Martin. 1996. An aggressive water plant from Australia and New Zealand: Crassula helmsii (Kirk) Cockayne: A new record in Westphalia and a literature review. Floristische Rundbriefe. 30(1). 1996. 24-29.
      Summary: In 1990, the swamp stonecrop Crassula helmsii (KIRK) COCKAYNE was found at a previously unknown locality in OerErkenschwick (Westphalia, Germany), It is localized in a secondary habitat, an artificial pond laid out recently on a landfill site for coal mine rubble.- After its fast spreading throughout the British Isles, C. helmsii now seems to be colonizing continental Europe. Besides a description of the locality in Oer-Erkenschwick, this publication contains a comprehensive list of taxonomic details and a review of previous publications on C. helmsii.

    30. Langdon, Samantha J., Marrs, Rob H., Hosie, Charlotte A., McAllister, Hugh A., Norris, Karen M., Potter, Jacqueline A. 2004. Crassula helmsii in U.K. Ponds: Effects on Plant Biodiversity and Implications for Newt Conservation. Weed Technology. 2004. Volume 18:1349–1352.

    31. Leach, J. and Dawson, H. 1999. Crassula helmsii in the British Isles - An unwelcome invader. British Wildlife 10 (4), pp. 234-239
      Summary: Available from: http://species.bsbi.org.uk/html/crassula_helmsii.html [Accessed 18 November 2009]
      Summary: Available from: http://www.europe-aliens.org/pdf/Crassula_helmsii.pdf [Accessed 18 November 2009]
      Summary: Available from: http://www.jncc.gov.uk/pdf/RIS/UK11043.pdf [Accessed 18 November 2009]
      Summary: Available from: http://www.jncc.gov.uk/pdf/RIS/UK11005.pdf [Accessed 18 November 2009]
      Summary: Available from: http://www.jncc.gov.uk/pdf/RIS/UK11053.pdf [Accessed 18 November 2009]
      Summary: Available from: http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?416223 [Accessed 18 November 2009]
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ISSG Landcare Research NBII IUCN University of Auckland