Biology:Batrachochytrium salamandrivorans

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Short description: Species of pathogenic chytrid fungus that infects amphibian species


Batrachochytrium salamandrivorans
Batrachochytrium salamandrivorans infection.png
Bsal infection in the skin of a fire salamander
Scientific classification edit
Domain: Eukaryota
Kingdom: Fungi
Division: Chytridiomycota
Class: Chytridiomycetes
Order: Rhizophydiales
Family: Batrachochytriaceae
Genus: Batrachochytrium
Species:
B. salamandrivorans
Binomial name
Batrachochytrium salamandrivorans
Martel A., Blooi M., Bossuyt F., Pasmans F. (2013)[1]

Batrachochytrium salamandrivorans (Bsal) is a pathogenic chytrid fungus that infects amphibian species. Although salamanders and newts seem to be the most susceptible, some anuran species are also affected. Bsal has emerged recently and poses a major threat to species in Europe and North America.

It was described in 2013 based on a strain collected from skin tissue of fire salamanders Salamandra salamandra. The pathogen, unidentified up to then, had devastated fire salamander populations in the Netherlands. Molecular phylogenetics confirmed it as related to the well known chytrid B. dendrobatidis. Like this species, it causes chytridiomycosis, which is manifested in skin lesions and is lethal for the salamanders.[1] Damage to the epidermal layer can be extensive and may result in osmoregulatory[2] issues or sepsis.[3]

Batrachochytrium salamandrivorans, clinical signs and pathology

Another study estimated that this species had diverged from B. dendrobatidis in the Late Cretaceous or early Paleogene. While initial susceptibility testing showed frogs and caecilians seemed to be resistant to Bsal infection, it was lethal to many European and some North American salamanders. East Asian salamanders were susceptible but able to tolerate infections. The fungus was also detected in a more-than-150-year-old museum specimen of the Japanese sword-tailed newt. This suggests it had originally emerged and co-evolved with salamanders in East Asia, forming its natural reservoir, and was introduced to Europe rather recently through the trade of species such as the fire belly newts as pets.[4] The asian origin hypothesis for Bsal is supported by additional studies which have found Bsal in wild urodela populations in Asia and in animals of asian origin being transported via the pet trade.[5][6][7] Since the pathogens initial discovery, it has been found in several additional areas across Europe in both wild and captive populations. One study was able to detect Bsal in 7 of 11 captive urodele collections.[8]

The description of this pathogen and its aggressiveness raised concern in the scientific community and the public, fearing that it might be a rising threat to Western hemisphere salamanders.[9][10] On January 12, 2016, the U.S. government issued a directive that prohibited the importation of salamanders in order to reduce the threat posed by B. salamandrivorans.[11]

Etymology

Batrachochytrium is derived from the Greek words batrachos, "frog", and chytra, "earthen pot" (describing the structure that contains unreleased zoospores); salamandrivorans is from the Greek salamandra, "salamander", and Latin vorans, "eating", which refers to extensive skin destruction and rapid death in infected salamanders.[12]

Confirmed and potential hosts of Batrachochytrium salamandrivorans
A yellow-spotted fire salamander
Salamandra salamandra
A newt with rough, warty skin on dead leaves
Taricha granulosa
A fire-belly newt kept between two fingers, showing its red underside
Cynops pyrrhogaster
A common newt species in found across the eastern United States
Notophthalmus viridescens
A common lungless salamander endemic to the eastern United States
Eurycea wilderae
Another species from a lungless salamander genera
Pseudotriton ruber
Populations of the fire salamander (left) have been severely decimated in the Netherlands.[1] The North American rough-skinned newt (centre) was killed by the fungus in laboratory tests.[4] The Japanese fire-belly newt (right) is somewhat resistant and could have been a vector for the pathogen's introduction to Europe.[4] The Eastern Newt, which is found across the eastern United States and parts of Canada is a susceptible Bsal host species.[4]

Susceptible species

The most comprehensive Bsal species susceptibility performed to date has been by Martel et al 2014.[4] Their experiments demonstrated Bsal susceptibility followed a phylogenetic trend with many Salamandridae species being lethally susceptible. Recent work has demonstrated that some lungless species, specifically those in the Spelerpini tribe might also be clinically susceptible to Bsal [13]

Threats to salamanders

Bsal is a serious threat to salamander species, while it has not yet been confirmed in North America,[14] Bsal has had catastrophic effects on certain European salamander populations, believed to be the cause of a 96% decline in populations with in the Netherlands.[15] More than a third of the worlds salamanders live in the United States,[16] and 40% of those salamanders are already threatened.[17] While regulations on the most likely avenue of introduction into North America, amphibian trade,[18] are in place in both Canada and the United States, regulations are seriously lacking in Mexico. Furthermore, Bsal has the potential to infect an estimated 80 to 140 North American salamander species.[19]

Tolerant

Susceptible

  • Cynops cyanurus
  • Cynops pyrrhogaster
  • Paramesotriton deloustali

Lethal

  • Hydromantes strinatii
  • Salamandrina perspicillata
  • Salamandra salamandra
  • Pleurodeles waltl
  • Tylototriton wenxianensis
  • Notophthalmus viridescens
  • Taricha granulosa
  • Euproctus platycephalus
  • Lissotriton italicus
  • Ichthyosaura alpestris
  • Triturus cristatus
  • Neurergus crocatus
  • Eurycea wilderae
  • Pseudotriton ruber

Information sources

More information on Bsal and other diseases impacting amphibian populations, including Batrachochytrium dendrobatidis and Ranavirus can be found at the Southeast Partners in Amphibian and Reptile Conservation disease task team web-page. [1]


References

  1. ↑ 1.0 1.1 1.2 Martel, A.; Spitzen-van der Sluijs, A.; Blooi, M.; Bert, W.; Ducatelle, R.; Fisher, M. C.; Woeltjes, A.; Bosman, W. et al. (2013). "Batrachochytrium salamandrivorans sp. nov. causes lethal chytridiomycosis in amphibians". Proceedings of the National Academy of Sciences 110 (38): 15325–15329. doi:10.1073/pnas.1307356110. PMID 24003137. Bibcode: 2013PNAS..11015325M.  open access
  2. ↑ Voyles, J.; Young, S.; Berger, L.; Campbell, C.; Voyles, W. F.; Dinudom, A.; Cook, D.; Webb, R. et al. (2009). "Pathogenesis of Chytridiomycosis, a Cause of Catastrophic Amphibian Declines". Science 326 (5952): 582–585. doi:10.1126/science.1176765. ISSN 0036-8075. PMID 19900897. Bibcode: 2009Sci...326..582V. 
  3. ↑ Bletz, Molly C.; Kelly, Moira; Sabino-Pinto, Joana; Bales, Emma; Van Praet, Sarah; Bert, Wim; Boyen, Filip; Vences, Miguel et al. (2018). "Disruption of skin microbiota contributes to salamander disease". Proceedings of the Royal Society B: Biological Sciences 285 (1885): 20180758. doi:10.1098/rspb.2018.0758. ISSN 0962-8452. PMID 30135150. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Martel, A.; Blooi, M.; Adriaensen, C.; Van Rooij, P.; Beukema, W.; Fisher, M. C.; Farrer, R. A.; Schmidt, B. R. et al. (2014). "Recent introduction of a chytrid fungus endangers Western Palearctic salamanders". Science 346 (6209): 630–631. doi:10.1126/science.1258268. PMID 25359973. Bibcode: 2014Sci...346..630M. 
  5. ↑ Cunningham, A. A.; Beckmann, K.; Perkins, M.; Fitzpatrick, L.; Cromie, R.; Redbond, J.; O'Brien, M. F.; Ghosh, P. et al. (2015). "Emerging disease in UK amphibians". Veterinary Record 176 (18): 468. doi:10.1136/vr.h2264. ISSN 0042-4900. PMID 25934745. https://discovery.ucl.ac.uk/id/eprint/1468653/. 
  6. ↑ Laking, Alexandra E.; Ngo, Hai Ngoc; Pasmans, Frank; Martel, An; Nguyen, Tao Thien (2017). "Batrachochytrium salamandrivorans is the predominant chytrid fungus in Vietnamese salamanders". Scientific Reports 7 (1): 44443. doi:10.1038/srep44443. ISSN 2045-2322. PMID 28287614. Bibcode: 2017NatSR...744443L. 
  7. ↑ Nguyen, Tao Thien; Nguyen, Thinh Van; Ziegler, Thomas; Pasmans, Frank; Martel, An (2017). "Trade in wild anurans vectors the urodelan pathogen Batrachochytrium salamandrivorans into Europe". Amphibia-Reptilia 38 (4): 554–556. doi:10.1163/15685381-00003125. ISSN 0173-5373. 
  8. ↑ Fitzpatrick, Liam D.; Pasmans, Frank; Martel, An; Cunningham, Andrew A. (2018). "Epidemiological tracing of Batrachochytrium salamandrivorans identifies widespread infection and associated mortalities in private amphibian collections". Scientific Reports 8 (1): 13845. doi:10.1038/s41598-018-31800-z. ISSN 2045-2322. PMID 30218076. PMC 6138723. Bibcode: 2018NatSR...813845F. http://discovery.ucl.ac.uk/10055421/7/Cunningham_Epidemiological%20tracing%20of%20Batrachochytrium%20salamandrivorans%20identifies%20widespread%20infection%20and%20associated%20mortalities%20in%20private%20amphibian%20collections.pdf. 
  9. ↑ Stokstad, E. (2014). "The coming salamander plague". Science 346 (6209): 530–531. doi:10.1126/science.346.6209.530. PMID 25359941. Bibcode: 2014Sci...346..530S. 
  10. ↑ Rhodi, Lee (2014-10-31). "Skin-eating fungus Batrachochytrium salamandrivorans threatens to wipe out salamanders worldwide". Tech Times. http://www.techtimes.com/articles/19150/20141031/skin-eating-fungus-batrachochytrium-salamandrivorans-threatens-to-wipe-out-salamanders-worldwide.htm. Retrieved 2015-06-05. 
  11. ↑ "Listing Salamanders as Injurious Due to Risk of Salamander Chytrid Fungus". U.S. Fish and Wildlife Service. January 12, 2016. http://www.fws.gov/injuriouswildlife/salamanders.html. 
  12. ↑ "Etymologia: Batrachochytrium salamandrivorans". Emerg Infect Dis 22 (7): 1282. July 2016. doi:10.3201/eid2207.ET2207. 
  13. ↑ Carter, E. Davis (2020). "Conservation risk of Batrachochytrium salamandrivorans to endemic lungless salamanders". Conservation Letters 13 (1). doi:10.1111/conl.12675. Bibcode: 2020ConL...13E2675C. 
  14. ↑ Koo, Michell (October 4, 2021). "Tracking, Synthesizing, and Sharing Global Batrachochytrium Data at AmphibianDisease.org". Frontiers in Veterinary Science 8. doi:10.3389/fvets.2021.728232. PMID 34692807. 
  15. ↑ Burke, Katie (6 February 2017). "New Disease Emerges as Threat to Salamanders". https://www.americanscientist.org/article/new-disease-emerges-as-threat-to-salamanders. 
  16. ↑ "Amphibian Species By the Numbers". https://amphibiaweb.org/amphibian/speciesnums.html. 
  17. ↑ Bishop, David. "Sustaining America's Aquatic Biodiversity, Salamnders Biodiversity and Consevation". https://digitalpubs.ext.vt.edu/vcedigitalpubs/5243479895813172/MobilePagedReplica.action?pm=1&folio=1#pg1. 
  18. ↑ Fisher, Mathew (Feb 25, 2020). "Chytrid fungi and global amphibian declines". Nature Reviews Microbiology 18 (6): 332-343. doi:10.1038/s41579-020-0335-x. PMID 32099078. https://doi.org/10.1038/s41579-020-0335-x. 
  19. ↑ Gray, Matthew J.; Carter, Edward Davis; Piovia-Scott, Jonah; Cusaac, J. Patrick W.; Peterson, Anna C.; Whetstone, Ross D. et al. (June 5, 2023). "Broad host susceptibility of North American amphibian species to Batrachochytrium salamandrivorans suggests high invasion potential and biodiversity risk". Nature Communications 14 (1): 3270. doi:10.1038/s41467-023-38979-4. Art. No. 3270. PMID 37277333. Bibcode: 2023NatCo..14.3270G. 

External links

Wikidata ☰ Q19826825 entry



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