Coypu

The coypu (from Spanish coipú, from Mapudungun koypu;[3][4] Myocastor coypus), also known as the nutria,[1][5] is a large, herbivorous,[6] semiaquatic rodent. Classified for a long time as the only member of the family Myocastoridae,[7] Myocastor is now included within Echimyidae, the family of the spiny rats.[8][9][2] The coypu lives in burrows alongside stretches of water, and feeds on river plant stems.[10] Originally native to subtropical and temperate South America, it has since been introduced to North America, Europe, Asia, and Africa, primarily by fur farmers.[11] Although it is still hunted and trapped for its fur in some regions, its destructive burrowing and feeding habits often bring it into conflict with humans, and it is considered an invasive species.[12]

For the boat, see Coypu (dinghy).

Coypu
Temporal range: Late Pliocene – Recent
↓
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Echimyidae
Subfamily: Echimyinae
Tribe: Myocastorini
Fabre et al., 2017[2]
Genus: Myocastor
Kerr, 1792
Species:
M. coypus
Binomial name
Myocastor coypus
(Molina, 1782)
Coypu range; native in red, introduced in pink

Etymology

The genus name Myocastor derives from the two Ancient Greek words μῦς (mûs), meaning "rat, mouse", and κάστωρ (kástōr), meaning "beaver".[13][14][15] Literally, therefore, the name Myocastor means "beaver rat".

Two names are commonly used in English for Myocastor coypus. The name "nutria" (from Spanish word nutria, meaning 'otter') is generally used in North America, Asia, and throughout countries of the former Soviet Union; however, in most Spanish-speaking countries, the word "nutria" refers primarily to the otter. To avoid this ambiguity, the name "coypu" or "coipo" (derived from the Mapudungun language) is used in Latin America and parts of Europe.[16] In France, the coypu is known as a ragondin. In Dutch, it is known as beverrat (beaver rat). In German, it is known as Nutria, Biberratte (beaver rat), or Sumpfbiber (swamp beaver). In Italy, instead, the popular name is, as in North America and Asia, "nutria", but it is also called castorino ("little beaver"), by which its fur is known in Italy. In Swedish, the animal is known as sumpbäver (marsh/swamp beaver). In Brazil, the animal is known as ratão-do-banhado (big swamp rat), nútria, or caxingui (the last from the Tupi language).

Taxonomy
Skull

The coypu was first described by Juan Ignacio Molina in 1782 as Mus coypus, a member of the mouse genus.[17] The genus Myocastor was assigned in 1792 by Robert Kerr.[18] Geoffroy Saint-Hilaire, independently of Kerr, named the species Myopotamus coypus,[19] and it is occasionally referred to by this name.

Four subspecies are generally recognized:[17]

  • M. c. bonariensis: northern Argentina, Bolivia, Paraguay, Uruguay, southern Brazil (RS, SC, PR, and SP)
  • M. c. coypus: central Chile, Bolivia
  • M. c. melanops: Chiloé Island
  • M. c. santacruzae: Patagonia

M. c. bonariensis, the subspecies present in the northernmost (subtropical) part of the coypu's range, is believed to be the type of coypu most commonly introduced to other continents.[16]

Phylogeny

Comparison of DNA and protein sequences showed that the genus Myocastor is the sister group to the genus Callistomys (painted tree-rats).[20][2] In turn, these two taxa share evolutionary affinities with other Myocastorini genera: Proechimys and Hoplomys (armored rats) on the one hand, and Thrichomys on the other hand.

Genus-level cladogram of the Myocastorini.
root  
         
         

  Callistomys (painted tree-rat)

 
 

  Myocastor (coypu)

 
 
         

  Thrichomys (punaré)

 
 
         

  Hoplomys (armored rat)

 
 

  Proechimys

 
 
 
The cladogram has been reconstructed from mitochondrial and nuclear DNA characters.[8][9][21][20][22][23][2]

Appearance
Large orange teeth are clearly visible on this coypu.

The coypu somewhat resembles a very large rat, or a beaver with a small tail. Adults are typically 4–9 kg (9–20 lb) in weight, and 40–60 cm (16–24 in) in body length, with a 30 to 45 cm (12 to 18 in) tail. It is possible for coypu to weigh up to 16 to 17 kg (35 to 37 lb), although adults usually average 4.5 to 7 kg (10 to 15 lb).[24][25][26] They have coarse, darkish brown outer fur with soft dense grey under fur, also called the nutria. Three distinguishing features are a white patch on the muzzle, webbed hind feet, and large, bright orange-yellow incisors.[27] The nipples of female coypu are high on her flanks, to allow their young to feed while the female is in the water.

A coypu is often mistaken for a muskrat, another widely dispersed, semiaquatic rodent that occupies the same wetland habitats. The muskrat, however, is smaller and more tolerant of cold climates, and has a laterally flattened tail it uses to assist in swimming, whereas the tail of a coypu is round. It can also be mistaken for a small beaver, as beavers and coypus have very similar anatomies. However, beavers' tails are flat and paddle-like, as opposed to the round tails of coypus.[28]

Life history

Coypus can live up to six years in captivity, but individuals uncommonly live past three years old; according to one study, 80% of coypus die within the first year, and less than 15% of a wild population is over three years old.[29] Male coypus reach sexual maturity as early as four months, and females as early as three months; however, both can have a prolonged adolescence, up to the age of 9 months. Once a female is pregnant, gestation lasts 130 days, and she may give birth to as few as one or as many as 13 offspring. They generally line nursery nests with grasses and soft reeds. Baby coypus are precocial, born fully furred and with open eyes; they can eat vegetation with their parents within hours of birth. A female coypu can become pregnant again the day after she gives birth to her young. If timed properly, a female can become pregnant three times within a year. Newborn coypus nurse for seven to eight weeks, after which they leave their mothers.[30]

Habitat and feeding

Besides breeding quickly, each coypu consumes large amounts of vegetation. An individual consumes about 25% of its body weight daily, and feeds year-round.[30][31] Being one of the world's larger extant rodents, a mature, healthy coypu averages 5.4 kg (11 lb 14 oz) in weight, but they can reach as much as 10 kg (22 lb).[32][33] They eat the base of the above-ground stems of plants, and often dig through the organic soil for roots and rhizomes to eat.[34] Their creation of "eat-outs", areas where a majority of the above- and below-ground biomass has been removed, produces patches in the environment, which in turn disrupts the habitat for other animals and humans dependent on marshes.[35]

Coypus are found most commonly in freshwater marshes, but also inhabit brackish marshes and rarely salt marshes.[36][37] They either construct their own burrows, or occupy burrows abandoned by beaver, muskrats, or other animals.[12] They are also capable of constructing floating rafts out of vegetation.[12]

Commercial and environmental issues
Myocastor coypus

Local extinction in their native range due to overharvesting led to the development of coypu fur farms in the late 19th and early 20th centuries. The first farms were in Argentina and then later in Europe, North America, and Asia. These farms have generally not been successful long-term investments, and farmed coypu often are released or escape as operations become unprofitable. The first attempt at coypu farming was in France in the early 1880s, but it was not much of a success.[38] The first efficient and extensive coypu farms were located in South America in the 1920s.[38] The South American farms were very successful, and led to the growth of similar farms in North America and Europe. Coypus from these farms often escaped, or were deliberately released into the wild to provide a game animal or to remove aquatic vegetation.[39]

Coypus were introduced to the Louisiana ecosystem in the 1930s, when they escaped from fur farms that had imported them from South America. Coypu were released into the wild by at least one Louisiana nutria farmer in 1933 and these releases were followed by E. A. McIlhenny who released his entire stock in 1945 on Avery Island.[40] In 1940, some of the nutria escaped during a hurricane and quickly populated coastal marshes, inland swamps, and other wetland areas.[41] From Louisiana, coypus have spread across the Southern United States, wreaking havoc on marshland.

Following a decline in demand for coypu fur, coypu have since become pests in many areas, destroying aquatic vegetation, marshes, and irrigation systems, and chewing through man-made items such as tires and wooden house panelling in Louisiana, eroding river banks, and displacing native animals. Damage in Louisiana has been sufficiently severe since the 1950s to warrant legislative attention; in 1958, the first bounty was placed on nutria, though this effort was not funded.[42]:3 By the early 2000s, the Coastwide Nutria Control Program was established, which began paying bounties for nutria killed in 2002.[42]:19–20 In the Chesapeake Bay region in Maryland, where they were introduced in the 1940s, coypus are believed to have destroyed 2,800 to 3,200 hectares (7,000 to 8,000 acres) of marshland in the Blackwater National Wildlife Refuge. In response, by 2003, a multimillion-dollar eradication program was underway.[43]

In the United Kingdom, coypus were introduced to East Anglia, for fur, in 1929; many escaped and damaged the drainage works, and a concerted programme by MAFF eradicated them by 1989.[44] However, in 2012, a "giant rat" was killed in County Durham, with authorities suspecting the animal was, in fact, a coypu.[45]

Marsh Dog, a US company based in Baton Rouge, Louisiana, received a grant from the Barataria-Terrebonne National Estuary Program to establish a company that uses nutria meat for dog food products.[46] In 2012, the Louisiana Wildlife Federation recognized Marsh Dog with "Business Conservationist of the Year" award for finding a use for this ecosustainable protein.[47]

In Kyrgyzstan and Uzbekistan, nutria (Russian and local languages Нутрия) are farmed on private plots and sold in local markets as a poor man's meat.[48] As of 2016, however, the meat is used successfully in Moscow restaurant Krasnodar Bistro, as part of the growing Russian localvore movement and as a 'foodie' craze.[48] It appears on the menu as a burger, hotdog, dumplings, or wrapped in cabbage leaves, with the flavour being somewhere between turkey and pork.[49]

In addition to direct environmental damage, coypus are the host for a nematode parasite (Strongyloides myopotami) that can infect the skin of humans, causing dermatitis similar to strongyloidiasis.[50] The condition is also called "nutria itch".[51]

Distribution

Native to subtropical and temperate South America, it has since been introduced to North America, Europe, Asia, and Africa, primarily by fur ranchers. The distribution of coypus outside South America tends to contract or expand with successive cold or mild winters. During cold winters, coypus often suffer frostbite on their tails, leading to infection or death. As a result, populations of coypus often contract and even become locally or regionally extinct as in the Scandinavian countries and such US states as Idaho, Montana, and Nebraska during the 1980s.[52] During mild winters, their ranges tend to expand northward. For example, in recent years, range expansions have been noted in Washington and Oregon,[53] as well as Delaware.[54]

According to the U.S. Geological Survey, nutria were first introduced to the United States in California, in 1899. They were first brought to Louisiana in the early 1930s for the fur industry, and the population was kept in check, or at a small population size, because of trapping pressure from the fur traders.[16] The earliest account of nutria spreading freely into Louisiana wetlands from their enclosures was in the early 1940s; a hurricane hit the Louisiana coast for which many people were unprepared, and the storm destroyed the enclosures, enabling the nutria to escape into the wild.[16] According to the Louisiana Department of Wildlife and Fisheries, nutria were also transplanted from Port Arthur, Texas, to the Mississippi River in 1941 and then spread due to a hurricane later that year.[55]

Nutria are spreading rapidly in Washington State.[56]

Herbivory damage to wetlands
Zoo animal on logs

Nutria herbivory "severely reduces overall wetland biomass and can lead to the conversion of wetland to open water.[31] " Unlike other common disturbances in marshlands, such as fire and tropical storms, which are a once- or few-times-a-year occurrence, nutria feed year round, so their effects on the marsh are constant. Also, nutria are typically more destructive in the winter than in the growing season, due largely to the scarcity of above-ground vegetation; as nutria search for food, they dig up root networks and rhizomes for food.[34] While nutria are the most common herbivores in Louisiana marshes, they are not the only ones. Feral hogs, also known as wild boars (Sus scrofa), swamp rabbits (Sylvilagus aquaticus), and muskrats (Ondatra zibethicus) are less common, but feral hogs are increasing in number in Louisiana wetlands. On plots open to nutria herbivory, 40% less vegetation was found than in plots guarded against nutria by fences. This number may seem insignificant, and indeed herbivory alone is not a serious cause of land loss, but when herbivory was combined with an additional disturbance, such as fire, single vegetation removal, or double vegetation removal to simulate a tropical storm, the effect of the disturbances on the vegetation were greatly amplified.[31] " Essentially, this means, as different factors were added together, the result was less overall vegetation. Adding fertilizer to open plots did not promote plant growth; instead, nutria fed more in the fertilized areas. Increasing fertilizer inputs in marshes only increases nutria biomass instead of the intended vegetation, therefore increasing nutrient input is not recommended.[31]

Wetlands in general are a valuable resource both economically and environmentally. For instance, the U.S. Fish and Wildlife Service determined wetlands covered only 5% of the land surface of the contiguous 48 United States, but they support 31% of the nation's plant species.[57] These very biodiverse systems provide resources, shelter, nesting sites, and resting sites (particularly Louisiana's coastal wetlands such as Grand Isle for migratory birds) to a wide array of wildlife. Human users also receive many benefits from wetlands, such as cleaner water, storm surge protection, oil and gas resources (especially on the Gulf Coast), reduced flooding, and chemical and biological waste reduction, to name a few.[57] In Louisiana, rapid wetland loss occurs due to a variety of reasons; this state loses an estimated area about the size of a football field every hour.[58] The problem became so serious that Sheriff Harry Lee of Jefferson Parish used SWAT sharpshooters against the animals.[59]

In 1998, the Louisiana Department of Wildlife and Fisheries (LDWF) conducted the first Louisiana coast-wide survey, which was funded by the Coastal Wetlands Planning, Protection, and Restoration Act and titled the Nutria Harvest and Wetland Demonstration Program, to evaluate the condition of the marshlands.[60] The survey revealed through aerial surveys of transects that herbivory damage to wetlands totaled roughly 90,000 acres. The next year, LDWF performed the same survey and found the area damaged by herbivory increased to about 105,000 acres.[36] The LDWF has determined the wetlands affected by nutria decreased from an estimated 80,000+ acres of Louisiana wetlands in 2002–2003 season to about 6,296 acres during the 2010–2011 season.[61] The LDWF stresses that coastal wetland restoration projects will be greatly hindered without effective, sustainable nutria population control.

A claimed environmentally sound solution is the use of nutria meat to make dog food treats.[62]

Control efforts

New Zealand

Coypus are classed as a "prohibited new organism" under New Zealand's Hazardous Substances and New Organisms Act 1996, preventing it from being imported into the country.[63]

Great Britain

In the UK, coypu escaped from fur farms and were reported in the wild as early as 1932. There were three unsuccessful attempts to control coypu in east Great Britain between 1943 and 1944. Coypu population and range increased causing damage to agriculture in the 1950s. During the 1960s, a grant was awarded to Rabbit Clearance Societies that included coypu. This control allowed for the removal of 97,000 coypu in 1961 and 1962. From 1962 to 1965, 12 trappers were hired to eradicate as many coypu as possible near the Norfolk Broads. The campaign used live traps allowing non-target species to be released while any coypu caught were shot. Combined with cold winters in 1962 to 1963, almost 40,500 coypu were removed from the population. Although coypu populations were greatly reduced after the 1962-1965 campaign ended, the population increased until another eradication campaign began in 1981. This campaign succeeded in fully eradicating coypu in Great Britain. The trapping areas were broken into 8 sectors leaving no area uncontrolled. The 24 trappers were offered an incentive for early completion of the 10-year campaign. In 1989 coypu were assumed eradicated as only 3 males were found between 1987 and 1989.[64]

Ireland

A coypu was first sighted in the wild in Ireland in 2010.

Some coypu escaped from a pet farm in Cork City in 2015 and began breeding on the outskirts of the city. Ten were trapped on the Curraheen River in 2017, but the rodents continued to spread, reaching Dublin via the Royal Canal in 2019.[65][66][67] Animals were found along the River Mulkear in 2015. The National Biodiversity Data Centre issued a species alert in 2017, saying that coypu "[have] the potential to be a high impact invasive species in Ireland. […] This species is listed as among 100 of the worst invasive species in Europe."[68]

United States
Trap for capturing coypu

Nutria herbivory "is perhaps the least studied or quantified aspect of wetland loss".[60] Many coastal restoration projects involve planting vegetation to stabilize marshland, but this requires proper nutria control to be successful.

Louisiana

The Louisiana Coastwide Nutria Control Program provides incentives for harvesting nutria. Starting in 2002, the Louisiana Department of Wildlife and Fisheries (LDWF) performed aerial surveys just as they had done for the Nutria Harvest and Wetland Demonstration Program, only it is now under a different program title. Under the Coastwide Nutria Control Program, which also receives funds from CWPPRA, 308,160 nutria were harvested the first year (2002–2003), revealing 82,080 acres damaged and totaling $1,232,640 in incentive payments paid out to those legally participating in the program.[61] Essentially, once a person receives a license to hunt or trap nutria, then that person is able to capture an unlimited number. When a nutria is captured, the tail is cut off and turned in to a Coastal Environments Inc. official at an approved site. As of 2019, each nutria tail is worth $6[69] which is an increase from $4 before the 2006–2007 season. Nutria harvesting increased drastically during the 2009–2010 year, with 445,963 nutria tails turned in worth $2,229,815 in incentive payments.[61] Each CEI official keeps record of how many tails have been turned in by each individual per parish, the method used in capture of the nutria, and the location of capture. All of this information is transferred to a database to calculate the density of nutria across the Louisiana coast, and the LDWF combines these data with the results from the aerial surveys to determine the number of nutria remaining in the marshes and the amount of damage they are inflicting on the ecosystem.[61]

Another program executed by LDWF involves creating a market of nutria meat for human consumption, though it is still trying to gain public notice. Nutria is a very lean, protein-rich meat, low in fat and cholesterol with the taste, texture, and appearance of rabbit or dark turkey meat.[70] Few pathogens are associated with the meat, but proper heating when cooking should kill them. The quality of the meat and the minimal harmful microorganisms associated with it make nutria meat an "excellent food product for export markets".[37]

Several desirable control methods are currently ineffective for various reasons. Zinc phosphide is the only rodenticide currently registered to control nutria, but it is expensive, remains toxic for months, detoxifies in high humidity and rain, and requires construction of (expensive) floating rafts for placement of the chemical. It is not yet sure how many nontarget species are susceptible to zinc phosphide, but birds and rabbits have been known to die from ingestion.[71] Therefore, this chemical is rarely used, especially not in large-scale projects. Other potential chemical pesticides would be required by the US Environmental Protection Agency to undergo vigorous testing before they could be acceptable to use on nutria. The LDWF has estimated costs for new chemicals to be $300,000 for laboratory, chemistry, and field studies, and $500,000 for a mandatory Environmental Impact Statement.[71] Contraception is not a common form of control, but is preferred by some wildlife managers. It also is expensive to operate - an estimated $6 million annually to drop bait laced with birth-control chemicals. Testing of other potential contraceptives would take about five to eight years and $10 million, with no guarantee of FDA approval.[71] Also, an intensive environmental assessment would have to be completed to determine whether any non-target organisms were affected by the contraceptive chemicals. Neither of these control methods is likely to be used in the near future.

In Louisiana, a claimed environmentally sound solution is the killing of nutria to make dog food treats.[62]

Atlantic coast

An eradication program on the Delmarva Peninsula, between Chesapeake Bay and the Atlantic coast, where they once numbered in the tens of thousands and had destroyed thousands of acres of marshland, had nearly succeeded by 2012.[72]

California

The first records of nutria invading California dates from the 1940s and 1950s, when the species was found in the agriculture-rich Central Valley and the south coast of the state, but by the 1970s the animals had been extirpated statewide.[73] They were found again in Merced County in 2017, on the edge of the San Joaquin River Delta. State officials are concerned that they will harm infrastructure that sends water to San Joaquin Valley farms and urban areas.[74] In 2019, the California Department of Fish and Wildlife (CDFW) received nearly $2 million in Governor Gavin Newsom's first budget, and an additional $8.5 million via the Delta Conservancy (a state agency focused on the Delta) to be spent over the course of three years.[75] The state has adopted an eradication campaign based on the successful effort in the Chesapeake Bay, including strategies such as the "Judas nutria" (in which individualized nutria are caught, sterilized, fitted with radio collars, and released, whereupon they can be tracked by hunters as they return to their colonies) and the use of trained dogs.[75] The state has also reversed a prior "no-hunting" policy, although hunting the animals does require a license.[75]

  • Coypu heart
  • Skull from various perspectives
  • By the river
  • Wild Coypu in Oise river in France
  • 10-day-old baby coypu

References
  1. Ojeda, R.; Bidau, C.; Emmons, L. (2016). "Myocastor coypus". IUCN Red List of Threatened Species. 2016 (errata version published in 2017): e.T14085A121734257.CS1 maint: uses authors parameter (link)
  2. Fabre, Pierre-Henri; Upham, Nathan S.; Emmons, Louise H.; Justy, Fabienne; Leite, Yuri L. R.; Loss, Ana Carolina; Orlando, Ludovic; Tilak, Marie-Ka; Patterson, Bruce D.; Douzery, Emmanuel J. P. (2017-03-01). "Mitogenomic Phylogeny, Diversification, and Biogeography of South American Spiny Rats". Molecular Biology and Evolution. 34 (3): 613–633. doi:10.1093/molbev/msw261. ISSN 0737-4038. PMID 28025278.
  3. "Coypu". Collins English Dictionary (Complete & Unabridged 10th ed.). United States: Dictionary.com. Archived from the original on 12 March 2013. Retrieved 2 March 2014.
  4. Muñoz Urrutia, Rafael, ed. (2006). Diccionario Mapuche: Mapudungun/Español, Español/Mapudungun (in Spanish) (2nd ed.). Santiago, Chile. p. 155. ISBN 978-956-8287-99-3.
  5. "Myocastor coypus". ITIS. Retrieved 23 September 2011.
  6. "Myocastor coypus (coypu)". Animal Diversity Web, Museum of Zoology. University of Michigan. 1999.
  7. Woods, C. A. (1982). "The history and classification of South American Hystricognath rodents: reflections on the far away and long ago". In Mares, M. A.; Genoways, H. H. (eds.). Mammalian Biology in South America. Pittsburgh: University of Pittsburgh. pp. 377–392.
  8. Galewski, Thomas; Mauffrey, Jean-François; Leite, Yuri L. R.; Patton, James L.; Douzery, Emmanuel J. P. (2005). "Ecomorphological diversification among South American spiny rats (Rodentia; Echimyidae): a phylogenetic and chronological approach". Molecular Phylogenetics and Evolution. 34 (3): 601–615. doi:10.1016/j.ympev.2004.11.015. PMID 15683932.
  9. Upham, Nathan S.; Patterson, Bruce D. (2012). "Diversification and biogeography of the Neotropical caviomorph lineage Octodontoidea (Rodentia: Hystricognathi)". Molecular Phylogenetics and Evolution. 63 (2): 417–429. doi:10.1016/j.ympev.2012.01.020. PMID 22327013.
  10. Taylor, K.; Grace, J.; Marx, B. (May 1997). "The effects of herbivory on neighbor interactions along a coastal marsh gradient". American Journal of Botany. 84 (5): 709. doi:10.2307/2445907. ISSN 0002-9122. JSTOR 2445907. PMID 21708623.
  11. LeBlanc, Dwight J. (1994). "Prevention and Control of Wildlife Damage – Nutria" (PDF). Animal and Plant Health Inspection Service. Archived from the original (PDF) on 3 February 2007.
  12. "Living with Wildlife - Nutria". Retrieved 2019-03-22.
  13. Bailly, Anatole (1981-01-01). Abrégé du dictionnaire grec français. Paris: Hachette. ISBN 978-2010035289. OCLC 461974285.
  14. Bailly, Anatole. "Greek-french dictionary online". www.tabularium.be. Retrieved 2017-01-24.
  15. Nutria Biology. Nutria.com. 2007. Retrieved on September 5, 2007.
  16. Carter, Jacoby (29 January 2007). "Worldwide Distribution, Spread of, and Efforts to Eradicate the Nutria (Myocastor coypus) – South America". United States Geological Survey. Retrieved 4 September 2007.
  17. C. A. Woods, L. Contreras, G. Willner-Chapman, H. P. Whidden (1992). Mammalian Species: Myocastor coypus. American Society of Mammalogists, 398: 1-8.
  18. ITIS Report. "ITIS Standard Report: Myocastor". Retrieved September 5, 2007.
  19. ITIS Report. "ITIS Standard Report: Myopotamus". Retrieved December 19, 2007.
  20. Loss, Ana; Moura, Raquel T.; Leite, Yuri L. R. (2014). "Unexpected phylogenetic relationships of the painted tree rat Callistomys pictus (Rodentia: Echimyidae)" (PDF). Natureza on Line. 12: 132–136.
  21. Fabre, Pierre-Henri; Galewski, Thomas; Tilak, Marie-ka; Douzery, Emmanuel J. P. (2013-03-01). "Diversification of South American spiny rats (Echimyidae): a multigene phylogenetic approach" (PDF). Zoologica Scripta. 42 (2): 117–134. doi:10.1111/j.1463-6409.2012.00572.x. ISSN 1463-6409. S2CID 83639441.
  22. Fabre, Pierre-Henri; Vilstrup, Julia T.; Raghavan, Maanasa; Der Sarkissian, Clio; Willerslev, Eske; Douzery, Emmanuel J. P.; Orlando, Ludovic (2014-07-01). "Rodents of the Caribbean: origin and diversification of hutias unravelled by next-generation museomics". Biology Letters. 10 (7): 20140266. doi:10.1098/rsbl.2014.0266. ISSN 1744-9561. PMC 4126619. PMID 25115033.
  23. Upham, Nathan S.; Patterson, Bruce D. (2015). "Evolution of Caviomorph rodents: a complete phylogeny and timetree for living genera". In Vassallo, Aldo Ivan; Antenucci, Daniel (eds.). Biology of caviomorph rodents: diversity and evolution. Buenos Aires: SAREM Series A, Mammalogical Research — Sociedad Argentina para el Estudio de los Mamíferos. pp. 63–120.
  24. Capel-Edwards, Maureen (1967). "Foot-and-mouth disease in Myocastor coypus". Journal of Comparative Pathology. 77 (2): 217–221. doi:10.1016/0021-9975(67)90014-X. PMID 4291914.
  25. Doncaster, C. P.; Micol, T. (1990). "Response by coypus to catastrophic events of cold and flooding". Ecography. 13 (2): 98–104. doi:10.1111/j.1600-0587.1990.tb00594.x.
  26. Hillemann, Howard H.; Gaynor, Alta I.; Stanley, Hugh P. (1958). "The genital systems of nutria(Myocastor coypus)". The Anatomical Record. 130 (3): 515–531. doi:10.1002/ar.1091300304. PMID 13559732. S2CID 12757377.
  27. "Myocastor coypus (Molina 1782) - Encyclopedia of Life". eol.org.
  28. "Species Profile: Castor canadensis – North American Beaver". Bella Vista Property Owners Association. Bella Vista, Arkansas. 5 February 2019. Retrieved 6 October 2019. They could be mistaken for a nutria, but nutria do not have the large flat paddle-shaped tail like beavers.
  29. Nolfo-Clements, Lauren E. (September 2009). "Nutria Survivorship, Movement Patterns, and Home Ranges". Southeastern Naturalist. 8 (3): 399–410. doi:10.1656/058.008.0303. ISSN 1938-5412. S2CID 86801126.
  30. "Biology". Nutria. Louisiana Department of Wildlife and Fisheries. Archived from the original on 22 October 2013. Retrieved 2 March 2014.
  31. McFalls, Tiffany B.; et al. (September 2010). "Hurricanes, floods, levees, and nutria: vegetation responses to interacting disturbance and fertility regimes with implications for coastal wetland restoration". Journal of Coastal Research. 26 (5): 901–11. doi:10.2112/JCOASTRES-D-09-00037.1. ISSN 1551-5036. S2CID 55697728.
  32. Hygnstrom, Scott E.; Timm, Robert M.; Larson, Gary E., eds. (1994). "Nutria". Internet Center for Wildlife Damage Management. Archived from the original on 7 September 2013. Retrieved 2 March 2014.
  33. "Detail (Coypu)". Barcelona Zoo. Spain: Barcelona City Council. Archived from the original on 26 September 2013. Retrieved 2 March 2014.
  34. Carter, Jacoby; et al. (March 1999). "Modeling the effects of nutria (Myocastor coypus) on wetland loss". Wetlands. 19 (1): 209–19. doi:10.1007/BF03161750. ISSN 1943-6246. S2CID 23151277.
  35. Ford, Mark, and J. B. Grace (1998). "Effects of Vertebrate Herbivores on Soil Processes, Plant Biomass, Litter Accumulation and Soil Elevation Changes in a Coastal Marsh." Journal of Ecology 86(6): 974-982.
  36. Jordan, Jillian; Mouton, E. "Coastwide Nutria Control Program 2010-2011" (PDF). Nutria.com. Louisiana Department of Wildlife and Fisheries. Retrieved 18 October 2011.
  37. Lyon, W.J., and J.B. Milliet (2000). "Microbial Flora Associated with Louisiana Processed Frozen and Fresh Nutria (Myocastor coypus) Carcasses." Journal of Food Science 65(6): 1041-1045.
  38. National Wetlands Research Center (June 2000), Nutria, Eating Louisiana's Coast, United States Geological Survey
  39. Carter, Jacoby, and Billy P. Leonard (2002). "A Review of the Literature on the Worldwide Distribution, Spread Of, and Efforts to Eradicate the Coypu (Myocastor coypus)." JSTOR. N.p., Web. 2 Nov. 2015.
  40. Nutria, Eating Louisiana's Coast (PDF) (Report). U.S. Geological Survey/National Wetlands Research Center. June 2000. USGS FS-020-00. Retrieved 28 March 2016.
  41. Bernard, Shane K. (November 2015). "Vol. 43, No. 3". M'sieu Ned's Rat? Reconsidering the Origin of Nutria in Louisiana. JSTOR. Avery Island, Louisiana.: The E. A. McIlhenny Collection, Louisiana Historical Association. JSTOR 4233862.
  42. Scarborough, Janet; Mouton, Edmond (30 June 2007), Nutria Harvest Distribution 2006-2007 and a Survey of Nutria Herbivory Damage in Coastal Louisiana in 2007 (PDF), archived (PDF) from the original on 7 January 2009
  43. "A Plague of Aliens" Feb/Mar 2003 edition of National Wildlife magazine, published by the National Wildlife Federation, article by Laura Tangley; accessed online December 8, 2006.
  44. Gosling, Morris (4 March 1989). "Extinction to Order". New Scientist. 121 (1564): 44–49.
  45. "Police To Investigate Man Who Killed 4ft Rat". Sky. Archived from the original on April 25, 2012. Retrieved 14 May 2012.
  46. "Article 404 - Daily Comet - Thibodaux, LA". Daily Comet. Retrieved 2017-07-19.
  47. "Louisiana Wildlife Federation". www.lawildlifefed.org. Archived from the original on 2016-07-29. Retrieved 2017-07-19.
  48. Walker, Shaun (2016-11-18). "Hot rat is so hot right now: Moscow falls for the rodent burger". The Guardian. ISSN 0261-3077. Retrieved 2017-07-19.
  49. "Rats! Rodent burger now the latest food craze in Moscow". The Straits Times. The Jakarta Post. 24 November 2016.
  50. "Strongyloidiasis: Background, Pathophysiology, Etiology". 2 February 2019 – via eMedicine. Cite journal requires |journal= (help)
  51. Bonilla, Hector F. MD; Blanchard, Diane H. MD; Sanders, Richard MD (June 2000). "Nutria Itch". Archives of Dermatology. Vol. 136, No. 6: JAMA Dermatology. 136 (6): 804–805. doi:10.1001/archderm.136.6.804-a. PMID 10871960.CS1 maint: location (link)
  52. Carter, Jacoby and Billy P. Leonard (Spring, 2002.) "A Review of the Literature on the Worldwide Distribution, Spread of, and Efforts to Eradicate the Coypu (Myocastor coypus)" Wildlife Society Bulletin 30(1): 162–175.
  53. Sheffels, Trevor Robert; Sytsma, Mark (December 2007). Report on Nutria Management and Research in the Pacific Northwest (Report). Center for Lakes and Reservoirs Publications and Presentations, Portland State University. Retrieved 2016-09-24.
  54. Montgomery, Jeff (2012), "Invasive nutria found in Kent County", The News Journal (published 19 Jan 2012), delawareonline, retrieved 19 Jan 2012, It was a surprise, frankly," Steve Kendrot, a U.S. Department of Agriculture wildlife services program manager, said Wednesday. "We didn't expect to find anything that far up.
  55. "History; Nutria Population Dynamics – A Timeline". Nutria.com. Louisiana Department of Wildlife and Fisheries. 2007. Retrieved 10 October 2011.
  56. "WISC - Washington Invasive Species Council - Nutria".
  57. "How do Wetlands Function and Why are they Valuable?". EPA. 2017. Retrieved 19 October 2011.
  58. Schleifstein, Mark (2 June 2011). "Louisiana is losing a football field of wetlands an hour, new U.S. Geological Survey study says". The Times-Picayune. Retrieved 29 November 2011.
  59. Ross, Bob (1 October 2007). "Jefferson Parish Sheriff Harry Lee dies". New Orleans Times-Picayune. Archived from the original on 11 October 2007. Retrieved 12 February 2018.
  60. "Monitoring Plan: Project No. LA-02 Nutria Harvest and Wetland Restoration Demonstration Project" (PDF). 6 May 1998. Retrieved 16 October 2011.
  61. "Program Updates". Nutria.com. Louisiana Department of Wildlife and Fisheries. 2007. Retrieved 18 October 2011.
  62. Dodge, Victoria. "A rodent-like pest destroying the Louisiana coast finds new enemy in dog treat business". Lafayette Daily Advertiser. USA Today. Retrieved September 7, 2019.
  63. "Hazardous Substances and New Organisms Act 2003 - Schedule 2 Prohibited new organisms". New Zealand Government. Retrieved 26 January 2012.
  64. Baker, S. (2010). "control and eradication of invasive mammals in Great Britain". Revue Scientifique et Technique (International Office of Epizootics). 29 (2): 311–327. doi:10.20506/rst.29.2.1981. PMID 20919585.
  65. Kelly, Olivia (22 March 2019). "Invasive rodent spotted along Dublin's Royal Canal". The Irish Times.
  66. Conroy, MacDara (21 March 2019). "Appeal For Sightings Of Invasive Coypu On Royal Canal In Dublin". AFloat.
  67. Brophy, Daragh (22 March 2019). "Large invasive rodent species that can 'cause a lot of damage' spotted along Royal Canal". The Journal.
  68. "Coypu Species Alert". National Biodiversity Data Centre. Ireland. 17 May 2017.
  69. Louisiana Coastwise Nutria Control Program: “The Coastwide Nutria Control Program consists of an economic incentive payment of $6 per nutria tail delivered...” Retrieved January 15, 2021.
  70. American Fur Breeder (37 ed.). 1964. p. 96. Rabbit and nutria meat are also fed on ranches. Both are lean and good sources of quality protein. Nutria, in particular, has been increasingly available in recent years. It is low in fat and leaner than either horse or rabbit meat
  71. "Nutria in Louisiana; LDWF brochure" (PDF). 2002. Retrieved 3 November 2011. as found in "Nutria Control Program" <http://www.nutria.com/site9.php>
  72. Emery, Theo (July 5, 2012). "Killed by Thousands, Varmint Will Never Quit". The New York Times. Retrieved July 6, 2012.
  73. "California's Invaders: Nutria". Habitat Conservation Planning Branch. California Department of Fish and Wildlife. Retrieved 21 July 2019.
  74. Fry, Hannah (February 16, 2019). "You think the rats at L.A. City Hall are bad? Officials have a $1.9-million plan to rid state marshlands of giant rodents". Los Angeles Times. Retrieved 16 February 2019.
  75. Ferguson, Cat (July 16, 2019). "California pledges millions to battle enormous, destructive swamp rats". San Jose Mercury News. Retrieved 21 July 2019.

Further reading
  • Sandro Bertolino, Aurelio Perrone, and Laura Gola "Effectiveness of coypu control in small Italian wetland areas" Wildlife Society Bulletin Volume 33, Issue 2 (June 2005) pp. 714–72.
  • Carter, Jacoby and Billy P. Leonard: "A Review of the Literature on the Worldwide Distribution, Spread of, and Efforts to Eradicate the Coypu (Myocastor coypus)" Wildlife Society Bulletin, Vol. 30, No. 1 (Spring, 2002), pp. 162–175.
  • Carter, J., A.L. Foote, and L.A. Johnson-Randall. 1999. Modeling the effects of nutria (Myocastor coypus) on wetland loss. Wetlands 19(1):209-219
  • Lauren E. Nolfo-Clements: Seasonal variations in habitat availability, habitat selection, and movement patterns of Myocastor coypus on a subtropical freshwater floating marsh. (Dissertation) Tulane University. New Orleans. 2006. ISBN 0-542-60916-9
  • Sheffels, Trevor and Mark Systma. "Report on Nutria Management and Research in the Pacific Northwest" Center for Lakes and Reservoir Environmental Sciences and Resources, Portland State University. December 2007. Available on-line:
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.