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词条 White-nose syndrome
释义

  1. Impact

  2. Research

     Cause  Infection  Signs of disease  Pathophysiology  Geographical spread  Decontamination 

  3. See also

  4. References

  5. External links

White-nose syndrome (WNS) is an emerging disease in North American bats which by 2018 has killed millions of bats in the United States and Canada.[1] The condition is named for a distinctive fungal growth around the muzzles and on the wings of hibernating bats. It was first identified from a February 2006 photo taken in a cave in Schoharie County, New York.[2] It has rapidly spread: By early 2018 it was found in 33 U.S. states and seven Canadian provinces and the fungus without the syndrome had been found in three more states.[3] Most cases are in the eastern half of the continent, but in March 2016 it was confirmed in a little brown bat in the state of Washington on the West Coast.[4]

The disease is caused by the fungus Pseudogymnoascus destructans, which colonizes the bat's skin. No obvious treatment or means of preventing transmission is known,[4][5] and some species have declined >90% within five years of the disease reaching a site.[6]

The US Fish and Wildlife Service (USFWS) has called for a moratorium on caving activities in affected areas[7] and strongly recommends to decontaminate clothing or equipment in such areas after each use. The National Speleological Society maintains an up-to-date page to keep cavers apprised of current events and advisories.[8]

Impact

{{As of| 2012}} white-nose syndrome was estimated to have caused at least 5.7 million to 6.7 million bat deaths in North America.[1] In 2008 bats declined in some caves by more than 90%,[11][9] Alan Hicks with the New York State Department of Environmental Conservation described the impact in 2008 as "unprecedented" and "the gravest threat to bats...ever seen."[10] In 2016, it was reported that bat populations in the caves and mines of Georgia had been decimated in a similar fashion, after the fungus was first detected in there in 2013.[11]{{As of| 2017}}, fifteen bat species, including three endangered species and one threatened species have been affected by WNS or exposed to the causative fungus, Pseudogymnoascus destructans, with impacts varying widely.[12] As of 2012 four species have suffered substantial declines and extinction of at least one species was predicted.[6] Declines included species already listed as endangered in the US, such as the Indiana bat, whose hibernacula, in many states, have been affected.[13] The once-common little brown bat has suffered a major population collapse in the northeastern US.[14] In 2012 the northern long-eared myotis (Myotis septentrionalis) was reported to be extirpated from all sites where the disease has been present for >4 years.[6] In 2009, the Virginia big-eared bat (Corynorhinus townsendii virginianus), the official state bat of Virginia,[15] and the gray bat had yet to suffer measurable declines.

Beyond the direct effect on bat populations, WNS has broader ecological implications. The Forest Service estimated in 2008 that the die-off from white-nose syndrome means that at least 2.4 million pounds of insects (1.1 million kg) will go uneaten and become a financial burden to farmers, possibly leading to crop damage or having other economic impact in New England.[16] It is estimated that bats save farmers in the U.S. 3 billion dollars annually in pest control services. In addition, numerous bat species provide crucial pollination and seed dispersal services.[17]

In 2008, comparisons were raised to colony collapse disorder, another incompletely understood phenomenon resulting in the abrupt disappearance of Western honey bee colonies,[23][18] and with chytridiomycosis, a fungal skin disease linked with worldwide declines in amphibian populations.[25][19]

Research

Biologists of the US Fish and Wildlife Service have been collecting information at each site in regard to the number of bats affected, the geographic extent of the outbreaks and samples of affected bats. They developed a geographic database to track the location of sites, where WNS has been found.[20]

The Fish and Wildlife Service has been partnering with the Northeastern Cave Conservancy to track movements of cavers that have visited affected sites in New York.[20]

In 2009, the Service advised closing caves to explorers in 20 states, from the Midwest to New England. This directive was supposed to be extended to 13 southern states. One Virginia scientist stated, "If it gets into caves more to our south, in places like Tennessee, Kentucky, Georgia and Alabama, we’re going to be talking deaths in the millions."[15] In March 2012, WNS was discovered on some tri-colored bats (Perimyotis subflavus) in Russell Cave in Jackson County, Alabama.[30]

Cause

The fungus Pseudogymnoascus destructans is the primary cause of WNS.[21]

It preferably grows in the 4–15 °C range (39–59 °F) and will not grow at temperatures above 20 °C (68 °F).[22] It is cold loving or psychrophilic.

It is phylogenetically related to Geomyces spp., but with a conidial morphology distinct from characterized members of this genus.[25]

Early laboratory research placed the fungus in the genus Geomyces,[23][24] but later phylogenic evaluation revealed this organism should be reclassified. The genera Geomyces and Pseudogymnoascus are closely related and found in the family Pseudeurotiaceae; P. destructans was found to be most closely related to the Pseudogymnoascus species in 2013, implying that its name should be changed to Pseudogymnoascus destructans.[25]

A 2011 study found that 100% of healthy North American bats infected with the fungus cultured from infected bats exhibit lesions consistent with the disease.[24] Direct microscopy and culture analyses demonstrated that the skin of the WNS-affected bats is colonized by the fungus.[23]

The species has been found on bats in Europe and Asia,[26][27][28] however, no unusual mortality could be assigned to the infections.[29][30] Genetic studies have shown that the fungus must have been in Europe for a long time and was most likely transported to North America as a novel pathogen.[31][32]

Infection

A laboratory experiment suggests that physical contact is required for one bat to infect another, because bats in mesh cages adjacent to infected bats did not contract the fungus. This implies that the fungus is not airborne, or at least, is not transmitted from bat to bat through the air.[24] The primary way this fungus is spread is through bat-to-bat contact or infected cave-to-bat contact. The role of humans in the spread of the disease is debated. It is likely the fungus was brought to North America by human activities, because no bats normally migrate between Europe and North America, and the fungus was first discovered in New York where there are major trans-Atlantic air and shipping terminals. Geographical translocation of bats by ship and airplane have been documented.[33] Research has shown the fungus can persist on human clothing and thus could be carried between locations by people, but as of 2016 it has not been demonstrated that this has played any role in the spread of the disease.[34][35]

Signs of disease

The signs observed with WNS include unusual winter behavior like abnormally frequent or abnormally long arousal from torpor (temporary hibernation), flying, loss of body fat, damage and scarring of the wing membranes, and death.

As early as 2011 it was hypothesized that prematurely expending the fat reserves for winter survival may be a cause for death.[36]

Pathophysiology

Until December 2014 the cause for the abnormal behavior was unclear, as no physiological data linking altered behavior to hypothesized increased energy demands existed.

The Fish and Wildlife Service published a case control study in December 2014: Of 60 little brown bats, 39 bats were randomly assigned to infection by applying conidia to skin of the dorsal surface of both wings and 21 bats remained controls. All were observed for 95 days and euthanized. 32 bats developed WNS (30 mild to moderate and 2 moderate to severe). The remaining seven infected bats were PCR-positive with normal wing histology.

Infected bats with WNS had higher proportions of lean tissue mass to fat tissue mass than uninfected bats in measuring an increase in total body water volume as a percent of body mass. Infected bats used twice as much energy as healthy bats, and starved to death. Direct calculations of energy expenditure failed for most bats, because isotope concentrations were indistinguishable from background. There was also no difference in torpor durations in this experiment; the average torpor duration for infected bats was 9.1 days with an average arousal of 54 min. Average torpor duration for control bats was 8.5 days with an average arousal duration of 55 min.[37] Infected bats suffered respiratory acidosis with an almost 40% higher mean pCO₂ than healthy bats, and potassium concentration was significantly higher.[37]

Hence the following model of infection exists:

Pseudogymnoascus destructans colonizes and eventually invades the wing epidermis. This causes increased energy expenditure, and an elevated blood pCO₂ and bicarbonate called chronic respiratory acidosis, possibly due to diffusion problems. Hyperkalemia (elevated blood potassium) ensues because of an acidosis-induced extracellular shift of potassium. Dying, infected cells could also leak their (intracellular) potassium into the blood. The damaged wing epidermis might stimulate increased frequencies of arousal from torpor, which removes excess CO₂ and normalizes blood pH, at the expense of hydration and fat reserves. With worsening wing damage, the effects are exacerbated by water and electrolyte loss across the wound (hypotonic dehydration), which stimulates more frequent arousals in a positive feedback loop that ultimately leads to death.[37]

Geographical spread

The disease was first reported in January 2007 in New York caves,[38] although it was retrospectively detected in a photograph taken in early 2006. It spread to other New York caves and into Vermont, Massachusetts, and Connecticut by 2008.[39][40] In early 2009, it was confirmed in New Hampshire,[41] New Jersey, Pennsylvania,[42] Virginia,[43] West Virginia[39] and in March 2010, in Ontario Canada, Maryland,[44] Middle Tennessee, Missouri,[45] and Quebec, Canada.[46][47] In 2011, the syndrome was confirmed in Ohio,[48] Indiana,[49] Kentucky,[50] North Carolina,[43] Maine,[51] New Brunswick and Nova Scotia.[52] In the winter of 2011–2012, Alabama,[53] Delaware[54] and Arkansas[55] confirmed the disease in bats and new cases showed up in northeastern Ohio,[56] and Acadia National Park in Maine.[57] Confirmed cases appeared in 2013 in Georgia,[58] South Carolina,[59] Illinois,[60] and the Canadian province of Prince Edward Island.[61] In March, 2014, WDNR and USGS staff conducting routine surveillance detected white-nose syndrome in a single mine in Grant County Wisconsin and the USGS National Wildlife Health Center later confirmed the disease.[62] In April, 2014, the Michigan Department of Natural Resources announced that the disease had been found in Alpena County, Mackinac County, and Dickinson County.[63] In May, 2014, after retesting, the Myotis velifer specimen from Oklahoma and other swabs and samples from the area tested negative, and Oklahoma and Myotis velifer were removed from the list of WNS suspects.[64]

As of April 2014, the syndrome had been confirmed in 25 states and 5 Canadian provinces.

The causative fungus has been confirmed in three additional states: Iowa, Minnesota, and Mississippi.[65]

A little brown bat (Myotis lucifugus) was found in Washington state infected with white-nose syndrome in March 2016. Researchers suspect through DNA analysis that the source of infection in this individual originated in the Eastern U.S. This has been the westernmost case discovered in North America thus far.[66]

A second case of white-nose syndrome was detected in Washington in April 2017. The infected bat was a Yuma myotis (Myotis yumanensis), which was the first time the disease has been found in this species.[67]

In March 2017, the fungus was found on bats in six north Texas counties, bringing the number of states with the fungus to 33. Three bat species tested positive.[68]

In April 2018, it was announced that bats in Kansas were documented with white-nose syndrome, making it the first time infected bats were found in Kansas.[69]

In May 2018, it was announced that bats in Manitoba were found to be infected with white-nose syndrome.[70]

Decontamination

The fungus Pseudogymnoascus destructans, or a closely related species of fungus, has been found in soil samples from infected caves and suggests that it can be transported from cave to cave by soil, such as that carried by human clothing.[71] Precautionary decontamination methods are being encouraged to inhibit the possible spread of spores by humans. The WNS Decontamination Team, a sub-group of the Disease Management Working Group, published a national decontamination protocol on March 15, 2012. They revised the protocol on June 25, 2012.[72] In May 2015, based upon laboratory tests, a recommendation was issued to increase the temperature of the hot water treatment for submersible gear to {{convert|60|C|F|abbr=on}} for 20 minutes (up from {{convert|50|C|F|abbr=on}}).[73] All other guidance in the existing protocol should be followed.

As of 2008, cave management and preservation organizations had begun requesting that cave visitors limit their activities and disinfect clothing and equipment that has been used in possibly infected caves.[74] The current protocol goes further, and indicates that in many cases it is inappropriate to reuse even disinfected gear, and that new gear should be used.[72]{{rp|see p.3 flow chart}}

In some cases, access to caves is being closed entirely.[75] According to New York State Department of Environmental Conservation Commissioner Basil Seggos, "Research ... demonstrates that white-nose syndrome makes bats highly susceptible to disturbances. Even a single, seemingly quiet visit can kill bats that would otherwise survive the winter. If you see hibernating bats, assume you are doing harm and leave immediately." When hibernating bats are disturbed, it raises their body temperatures, depleting fat reserves.[76]

See also

  • Anthropocene
  • Chytridiomycosis
  • Decline in amphibian populations
  • Holocene extinction

References

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45. ^{{cite web |url=http://mdc.mo.gov/discover-nature/outdoor-recreation/caving/white-nose-syndrome-missouri |title=White-Nose Syndrome in Missouri | Missouri Department of Conservation |publisher=Mdc.mo.gov |access-date=2014-03-15 |deadurl=yes |archive-url=https://www.webcitation.org/6EenGC9wS?url=http://mdc.mo.gov/discover-nature/outdoor-recreation/caving/white-nose-syndrome-missouri |archive-date=2013-02-23 |df= }}
46. ^{{cite news|title=White Nose Syndrome Detected In Ontario Bats|author=Ontario Ministry of Natural Resources|url=http://www.mnr.gov.on.ca/en/Newsroom/LatestNews/289824.html|access-date=2010-03-19|date=March 19, 2010|archive-url=https://web.archive.org/web/20100324041507/http://www.mnr.gov.on.ca/en/Newsroom/LatestNews/289824.html|archive-date=24 March 2010}}
47. ^{{cite news|title=Bat in Clarksville's Dunbar Cave with deadly fungus may be migrant|first=Chris|last=Smith| name-list-format = vanc |publisher=The Leaf-Chronicle|url=http://www.theleafchronicle.com/apps/pbcs.dll/article?AID=2010100324016|access-date=2010-03-24}}{{Dead link|date=July 2018 |bot=InternetArchiveBot |fix-attempted=yes }}
48. ^{{cite web|url=http://www.ohiodnr.com/home_page/NewsReleases/tabid/18276/EntryId/2194/White-nose-Syndrome-Detected-in-Ohio.aspx |title=White-nose Syndrome Detected in Ohio |publisher=Ohio DNR |date=2011-03-30 |access-date=2014-03-15}}
49. ^{{cite web|url=http://www.in.gov/portal/news_events/66544.htm |title=Newsroom |publisher=State of Indiana |date=2011-02-01|access-date=2014-03-15}}
50. ^{{cite web|url=https://www.whitenosesyndrome.org/news/white-nose-syndrome-spreads-kentucky |title=WNS spreads in Kentucky |publisher=White-Nose Syndrome |access-date=2014-03-15}}
51. ^{{cite web|url=http://www.maine.gov/ifw/wildlife/disease/white_nose_syndrome.htm|title=White Nose Syndrome|website=Maine Department of Inland Fisheries and Wildlife}}
52. ^{{cite web|url=https://www.whitenosesyndrome.org/news/early-signs-white-nose-syndrome-spreading-bats |title=Early Signs of White Nose Syndrome Spreading to Bats |publisher=White-Nose Syndrome |access-date=2014-03-15}}
53. ^1 {{cite web|url=https://alabamabatwg.wordpress.com/category/wns-in-alabama-updates/ |title=WNS in Alabama Updates | Alabama Bat Working Group |date=22 April 2013|author=Tennessee Valley Authority |publisher=Alabamabatwg.wordpress.com |access-date=2014-03-15}}
54. ^{{cite web|url=http://www.dnrec.delaware.gov/News/Pages/White-Nose-Syndrome-detected-in-Delaware-bats.aspx |title=White-Nose Syndrome detected in Delaware bats|publisher=DNRec.delaware.gov |access-date=2014-03-15}}
55. ^{{cite web|url=http://batcon.org/pdfs/whitenose/WNS%20News%20Release%20072913-Final.pdf|title=Fungus that kills bats prompts continued precautions at Arkansas caves|date=28 July 2013|format=PDF|author=Arkansas Game and Fish Commission}}
56. ^{{cite news |title=Deadly white-nose syndrome found on bats in Cuyahoga and Geauga County parks |date=2012-02-16 |access-date=2012-02-17 |url=http://blog.cleveland.com/metro/2012/02/deadly_white-nose_syndrome_fou_1.html |first=Pat|last=Galbincea | name-list-format = vanc |publisher=The Plain Dealer}}
57. ^{{cite news |title=Bat Disease, White-Nose Syndrome, Confirmed in Acadia National Park: Not Harmful to Humans, but Deadly to Bats |date=20 March 2012|access-date=2012-03-21 |url=https://www.whitenosesyndrome.org/sites/default/files/files/wnsconfirmedmaine_052411.pdf|author=Acadia National Park|publisher=Fish and Wildlife Service}} (PDF linked from [https://www.whitenosesyndrome.org/news/bat-disease-white-nose-syndrome-confirmed-maine-not-harmful-humans-deadly-bats White-Nose Syndrome.org])
58. ^{{cite news|title=Disease Deadly to Bats Confirmed in Georgia|date=12 March 2013|access-date=2013-03-26|url=http://www.georgiawildlife.com/node/3245|author=Georgia Department of Natural Resources News Release|archive-url=https://web.archive.org/web/20130322041409/http://www.georgiawildlife.com/node/3245|archive-date=22 March 2013|dead-url=yes|df=dmy-all}}
59. ^{{cite news |title=Bat disease white-nose syndrome confirmed in South Carolina|date=2013-03-11 |access-date=2013-03-26 |url=http://dnr.sc.gov/news/yr2013/march14/march14_batwns.html|author=South Carolina Department of Natural Resources News Release}}
60. ^{{cite news |title=White-Nose Syndrome Confirmed in Illinois Bats|date=2013-02-28 |access-date=2013-03-26 |url=http://www.caves.org/WNS/Illinois%20Detection.pdf|author=Illinois Department of Natural Resources News Release}}
61. ^{{cite web|url=http://www.cbc.ca/news/canada/prince-edward-island/bat-white-nose-syndrome-confirmed-on-p-e-i-1.1321559 |title=Bat white-nose syndrome confirmed on Prince Edward Island |publisher=CBC News |date=2013-02-27 |access-date=2014-03-15}}
62. ^{{cite web|url=http://dnr.wi.gov/news/BreakingNews_Lookup.asp?id=3169|title=Deadly bat disease detected in single Wisconsin site; State joins 23 others in confirming white-nose syndrome|date=10 April 2014|publisher=Wisconsin Department of Natural Resources}}
63. ^{{cite news|publisher=Detroit Free Press| date =11 April 2014| page=1A|title=Detroit Free Press article}}
64. ^{{cite web|title=Oklahoma removed from list of suspected bat fungus areas|url=http://www.wildlifedepartment.com/media/batfungus.htm|publisher=Oklahoma Department of Wildlife Conservation|access-date=13 May 2014|date=}}
65. ^{{cite web|url=http://www.whitenosesyndrome.org/about/where-is-it-now |title=Where is it now? |publisher=White-Nose Syndrome |date=|access-date=2015-01-09}}
66. ^{{Cite web|url=https://www.usgs.gov/news/deadly-bat-fungus-washington-state-likely-originated-eastern-us|title=Deadly Bat Fungus in Washington State Likely Originated in Eastern U.S.|website=www.usgs.gov|access-date=2016-09-29}}
67. ^{{cite web |url=https://www.whitenosesyndrome.org/blog/researchers-work-stop-spread-white-nose-syndrome-washington |title=Researchers work to stop the spread of white-nose syndrome in Washington |last=Froschauer| first=Ann | name-list-format = vanc |date=May 11, 2017 |website= white-nose syndrome.org|publisher=U.S. Fish and Wildlife Service |access-date=May 12, 2017}}
68. ^{{cite web|title=Fungus that Causes White-nose Syndrome in Bats Detected in Texas|url=http://tpwd.texas.gov/newsmedia/releases/?req=20170323c|website=Texas Parks and Wildlife|publisher=Texas Parks and Wildlife|access-date=4 April 2007}}
69. ^{{cite web| url=https://www.ksal.com/bat-disease-detected-in-kansas/| title=Bat Disease Detected in Kansas| author=Kansas Department of Wildlife, Parks and Tourism| date=2 April 2018| website=KSAL.com| publisher=Rocking M Media| access-date=2 April 2018}}
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71. ^{{cite journal | vauthors = Lindner DL, Gargas A, Lorch JM, Banik MT, Glaeser J, Kunz TH, Blehert DS | title = DNA-based detection of the fungal pathogen Geomyces destructans in soils from bat hibernacula | journal = Mycologia | volume = 103 | issue = 2 | pages = 241–6 | date = 2011-03-18 | pmid = 20952799 | doi = 10.3852/10-262 | url = http://www.mycologia.org/content/103/2/241.full }}
72. ^1 {{cite web|last=WNS Decontamination Team|title=National White-Nose Syndrome Decontamination Protocol v 06.25.2012|url=http://www.whitenosesyndrome.org/sites/default/files/resource/national_wns_revise_final_6.25.12.pdf}}
73. ^{{cite web|last= Geboy|first=Richard| name-list-format = vanc |title=National Decontamination Protocol Update |publisher= Midwest Regional WNS Coordinator, US Fish & Wildlife Service|url=http://caves.org/WNS/Decon%20Update.pdf}}
74. ^{{cite web |title=Something is killing our bats: The white-nose syndrome mystery |publisher=US Fish and Wildlife Service |url=http://www.fws.gov/northeast/white_nose.html |access-date=2008-02-14}}
75. ^{{cite news | last = Munger | first = Edward | name-list-format = vanc |title=Group asking cavers to keep out |url=http://www.dailygazette.com/news/2008/feb/14/0214_caves/ |work=Daily Gazette |date=2008-02-14 |access-date=2008-02-14}}
76. ^{{cite web|title=DEC Reminds the Public to Avoid Seasonal Caves and Mines to Protect Bat Populations|url=http://www.dec.ny.gov/press/108239.html|publisher=New York State Department of Environmental Conservation|access-date=1 November 2016|date=28 December 2016}}

External links

{{Commons category|White-Nose Syndrome}}
  • Species Profile- White-Nose Syndrome, National Invasive Species Information Center, United States National Agricultural Library. Lists general information and resources for White-Nose Syndrome.
  • White-nose Syndrome from the US Fish and Wildlife Service Northeast Region (public domain photos and [https://www.flickr.com/photos/usfwsnortheast/sets/72157622507962203/ Flickr page])
  • White Nose Syndrome: The mystery fungus killing our bats, a comprehensive article from Wild Things Sanctuary
  • White-Nose Syndrome Threatens the Survival of Hibernating Bats in North America from the US Geological Survey Fort Collins Science Center
  • [https://web.archive.org/web/20091103234442/http://resourcescommittee.house.gov/index.php?option=com_jcalpro&Itemid=54&extmode=view&extid=259 Testimony] before the US House Committee on Natural Resources on June 4, 2009
  • WNS News from the National Speleological Society
  • [https://web.archive.org/web/20091001014829/http://www.batcon.org/index.php/what-we-do/white-nose-syndrome/subcategory/468.html WNS News Archive] from Bat Conservation International
{{DEFAULTSORT:White Nose Syndrome}}

6 : Animal fungal diseases|Speleology|Bat diseases|Population ecology|Syndromes in animals|Articles containing video clips
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