Elodea
{{Short description|Genus of aquatic plants}}
{{Automatic taxobox
| image = Elodea canadensis.jpeg
| image_caption = Elodea canadensis foliage detail
| taxon = Elodea
| authority = Michx., 1803
| subdivision_ranks =
| subdivision =
| synonyms_ref = {{cite POWO |id=30042890-2 |title=Elodea Michx. |access-date=13 October 2024}}
| synonyms = {{Species list
| Anacharis | Rich. (1808)
| Apalanthe | Planch. (1848)
| Diplandra | Bertero (1829)
| Egeria | Planch. (1849)
| Hydora | Besser (1832)
| Philotria | Raf. (1818)
| Serpicula | Pursh (1816)
| Udora | Nutt. (1818)
}}
}}
Elodea is a genus of eight species of aquatic plants often called the waterweeds described as a genus in 1803. Classified in the frog's-bit family (Hydrocharitaceae), Elodea is native to the Americas and is also widely used as aquarium vegetation and laboratory demonstrations of cellular activities. It lives in fresh water.Luteyn, J. L. 1999. Páramos, a checklist of plant diversity, geographical distribution, and botanical literature. Memoirs of The New York Botanical Garden 84: viii–xv, 1–278 An older name for this genus is Anacharis, which serves as a common name in North America.{{Cite web|url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=111486|title=Elodea in Flora of North America @ efloras.org|website=www.efloras.org|access-date=2017-01-31}}
The introduction of some species of Elodea into waterways in parts of Europe, Australia, Africa, Asia, and New Zealand has created a significant problem and it is now considered a noxious weed in these areas.
- Elodea bifoliata {{small|H.St.John}} – Canada (AB, SK), W United States (OR + CA to NM + MN)
- Elodea callitrichoides {{small|(Rich.) Casp.}} – Argentina, Uruguay
- Elodea canadensis {{small|Michx.}} – most of United States + Canada
- Elodea densa {{small|(Planch.) Casp.}}
- Elodea granatensis {{small|Bonpl.}} – much of South America
- Elodea heterostemon {{small|(S.Koehler & C.P.Bove) Byng & Christenh.}}
- Elodea najas {{small|(Planch.) Casp.}}
- Elodea nuttallii {{small|(Planch.) H.St.John}} – much of United States + Canada
- Elodea potamogeton {{small|(Bertero) Espinosa}} – Chile, Peru, Bolivia, Ecuador
Chemical control
Chemical methods are ineffective in eradicating Elodea – at best they only slow growth for a season or two.{{Cite web|title = Efficacy of Fluridone, Penoxsulam, and Bispyribac-sodium on Variable-leaf Milfoil|url = https://www.researchgate.net/publication/228961575|website = ResearchGate|access-date = 2015-08-26}} As Elodea spreads into new ecosystems, it experiences rapid growth for 5–6 years and then slows as soil nutrients are used up.{{Cite journal|title = Does competition for phosphate supply explain the invasion pattern of Elodea species?|journal = Water Research|date = 2005-09-01|issn = 0043-1354|pmid = 16026814|pages = 3385–3393|volume = 39|issue = 14|doi = 10.1016/j.watres.2005.05.036|first = Gabrielle|last = Thiébaut| bibcode=2005WatRe..39.3385T }} Elodea is threatening aquatic environments across Europe.{{Cite journal|title = Genetic diversity in three invasive clonal aquatic species in New Zealand|journal = BMC Genetics|date = 2010-06-18|issn = 1471-2156|pmc = 2902404|pmid = 20565861|pages = 52|volume = 11|doi = 10.1186/1471-2156-11-52|first1 = Carla|last1 = Lambertini|first2 = Tenna|last2 = Riis|first3 = Birgit|last3 = Olesen|first4 = John S|last4 = Clayton|first5 = Brian K|last5 = Sorrell|first6 = Hans|last6 = Brix | doi-access=free }} Chemicals may be used in places that cause undue economic concerns, but very few aquatic herbicides are registered for aquatic use in the EU. Fluridone, the most commonly used aquatic herbicide is highly effective against Hydrilla, but only marginally effective against Elodea, especially at lower use rates.{{Cite journal|title = Molecular evolution of herbicide resistance to phytoene desaturase inhibitors in Hydrilla verticillata and its potential use to generate herbicide-resistant crops|journal = Pest Management Science|date = 2005-03-01|issn = 1526-498X|pmid = 15668922|pages = 258–268|volume = 61|issue = 3|doi = 10.1002/ps.1022|first1 = Renée S.|last1 = Arias|first2 = Michael D.|last2 = Netherland|first3 = Brian E.|last3 = Scheffler|first4 = Atul|last4 = Puri|first5 = Franck E.|last5 = Dayan| s2cid=23469042 | url=https://digitalcommons.unl.edu/usdaarsfacpub/901 }}{{Cite journal|title = Somatic mutation-mediated evolution of herbicide resistance in the nonindigenous invasive plant hydrilla (Hydrilla verticillata)|journal = Molecular Ecology|date = 2004-10-01|issn = 0962-1083|pmid = 15367135|pages = 3229–3237|volume = 13|issue = 10|doi = 10.1111/j.1365-294X.2004.02280.x|first1 = Albrecht|last1 = Michel|first2 = Renee S.|last2 = Arias|first3 = Brian E.|last3 = Scheffler|first4 = Stephen O.|last4 = Duke|first5 = Michael|last5 = Netherland|first6 = Franck E.|last6 = Dayan| bibcode=2004MolEc..13.3229M |s2cid = 19191358|url = https://naldc-legacy.nal.usda.gov/naldc/download.xhtml?id=12131&content=PDF}}{{Dead link|date=March 2024 |bot=InternetArchiveBot |fix-attempted=yes }}{{Cite web|url=http://www.sepro.com/documents/Sonar-H4C_Label.pdf|title=SONAR H4C Label|last=Sepro|first=Corp|website=Sonar H4C Aquatic Herbicide|publisher=Sepro}}
Mechanical control
file:Berky Mähsammelboot Elodea.jpg collecting Elodea from a lake]]
The plants can also be removed from lakes and rivers mechanically. They are extracted either by hand or by using rakes, chains, mowing boats or weed buckets. The problem is that through vegetative reproduction via fragments, mechanical removal methods can contribute to the spread of the plant. Torn fragments can be transported downstream or are introduced to new environments via attachment to boats and anchor chains.{{cite web | url=http://www.iucngisd.org/gisd/speciesname/Elodea+canadensis | title=GISD }}
See also
- Stormy Lake (Alaska) a lake where Fluoridone was successfully used to eliminate elodea
- Grass carp also effective against elodea
References
{{Reflist}}
External links
- {{Commons category-inline}}
- [http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?8169,8172 Jepson Manual Treatment]
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