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Mayaheros

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Mayaheros
Mayaheros urophthalmus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cichliformes
Family: Cichlidae
Tribe: Heroini
Genus: Mayaheros
Říčan & Piálek, 2016[1]
Type species
Heros urophthalmus
Günther, 1862

Mayaheros is a genus of cichlid fish that is native to Mexico and northern Central America. This genus has a disjunct distribution, with the M. urophthalmus group being found in the Atlantic drainages of southeastern Mexico (southern Veracruz east to the Yucatán Peninsula and southwards), Belize, eastern Guatemala, northern Honduras and northeastern Nicaragua, while M. beani is the northernmost cichlid in the Pacific drainage, ranging from Jalisco to Sonora in northwestern Mexico.[1][2][3] Both inhabit a wide range of habitats such as freshwater rivers, streams, lakes, ponds, pools and marshes, as well as brackish waters like estuaries, lagoons and mangrove, with members of the M. urophthalmus group sometimes even occurring in caves or coastal marine waters.[2][3][4] They are medium-sized to large cichlids that are omnivorous, feeding mostly on small animals, but also plants and detritus.[5][6][7]

Mayaheros cichlids are sometimes kept in aquariums and commonly caught for food. Broadstock of the M. urophthalmus group that is better suited for farming is being developed by Mexican authorities;[8] M. beani also has potential in farming, but preliminary tests have been complicated by its high levels of aggression.[9] Both M. beani and M. urophthalmus are overall common and regarded as least concern by the IUCN, although certain local populations are under pressure from habitat loss, pollution, overfishing and introduced species.[2][3] A captive breeding program exists for a few populations of M. beani.[4] If many species are recognized within the M. urophthalmus group (see #Species), most are restricted to a single location in the Yucatán Peninsula region, such as a lagoon, cenote, cave, island or bay, and some are seriously threatened. The most threatened –if not already extinct– are likely M. conchitae of the Conchita Cenote and M. ericymba of the Sambulá Cave (M. ericymba has enlarged eyes and sensory pores, likely an adaption to its low-light habitat[10]), which both are located at the city of Mérida. The Conchita Cenote appears to have disappeared entirely and while the Sambulá Cave still exists, M. ericymba has not been seen since the 1930s.[11][12] If recognized as valid species or subspecies of M. urophthalmus, these two are the only likely extinct cichlids of the Americas.[13][14] Conversely, M. urophthalmus has been introduced outside its native range in Oaxaca (Mexico), Florida (United States), the Philippines, Thailand and Singapore.[3][15][16] It is unclear which member of the M. urophthalmus group is involved in these introductions, except in Florida where the population was based on individuals from several different locations in the M. urophthalmus group's native range.[17]

Taxonomy

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Both the species beani and urophthalmus were first scientifically described as members of the genus Heros and then moved to Cichlasoma despite clearly belonging elsewhere.[18][19] Mayaheros was only established for them in 2016.[1]

Species

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Traditionally, only two species have been recognized in this group: the northwest Mexican beani, and the southeast Mexican and northern Central American urophthalmus. The latter had a large number of subspecies that had been described in 1935–38 by Carl Leavitt Hubbs based on exact colour patterns (notably of their body stripes and tail base spot) and morphometrics. In a taxonomic review of 2003, those that had been described in 1936–38 by Hubbs and troschelii described in 1867 by Franz Steindachner were preliminarily elevated to species status, thus increasing the number of recognized species in the urophthalmus group to eleven.[1][19] In a 2005 thesis, it was proposed that all those, trispilus described in 1935 by Hubbs, and eight additional currently undescribed species (names were proposed, but the thesis does not comply with article 8 of the ICZN Code[20]) should be recognized in the urophthalmus group based on colour patterns and morphometrics.[11] This would effectively limit "true" M. urophthalmus to the Lake Petén system in Guatemala.[1][11] Other reviews of many of the populations in the urophthalmus group found that genetic differences are very small without clear geographic structure, that there likely has been widespread translocations of the cichlids by humans in the pre-Columbian era, and that there is a large amount of individual variations in pattern and morphometrics, mostly depending on environmental factors.[17][21][22][23] This points to a single variable species with a high degree of phenotypic plasticity rather than several different species in the urophthalmus group.[17][21][23] As a consequence, all proposed species that were directly checked in those studies have been synonymized with M. urophthalmus by Catalog of Fishes, leaving only the unchecked M. aguadae, M. amarus, M. ericymba and M. trispilus as still recognized in this group.[18] In the IUCN's evaluation of 2019, M. urophthalmus had been returned to its original single-species form without other recognized species in the group.[3] In contrast to the complicated taxonomic status of M. urophthalmus, the single-species taxonomy of M. beani is agreed upon by all major authorities.[1][2][18][24]

Unlike Catalog of Fishes and the IUCN, FishBase continues to recognize thirteen species in this genus, including M. urophthalmus itself and eleven others in its group (indented in list):[24]

The species Amphilophus istlanus (still included in Cichlasoma by some authorities) is a special case, as nDNA places it in Amphilophus, but mDNA places it in Mayaheros. It is likely that istlanus is the result of hybrid speciation involving M. beani and A. trimaculatus.[1]

References

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  1. ^ a b c d e f g Říčan, O.; Piálek, L.; Dragová, K. & Novák, J. (2016). "Diversity and evolution of the Middle American cichlid fishes (Teleostei: Cichlidae) with revised classification". Vertebrate Zoology. 66 (1): 1–102. doi:10.3897/vz.66.e31534. S2CID 257203657.
  2. ^ a b c d Lyons, T.J. (2019). "Mayaheros beani". IUCN Red List of Threatened Species. 2019: e.T191844A2007699. doi:10.2305/IUCN.UK.2019-2.RLTS.T191844A2007699.en. Retrieved 29 December 2021.
  3. ^ a b c d e Schmitter-Soto, J. & Vega-Cendejas, M. (2019). "Mayaheros urophthalmus". IUCN Red List of Threatened Species. 2019: e.T62217A3110044. doi:10.2305/IUCN.UK.2019-2.RLTS.T62217A3110044.en. Retrieved 29 December 2021.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ a b "Mayaheros beani (formerly: Cichlasoma b.)". AquariumGlaser. 28 December 2021. Retrieved 29 December 2021.
  5. ^ Bergmann, G.T.; Motta, P.J. (2005). "Diet and morphology through ontogeny of the nonindigenous Mayan cichlid 'Cichlasoma (Nandopsis)' urophthalmus (Günther 1862) in southern Florida". Environmental Biology of Fishes. 72 (2): 205–211. Bibcode:2005EnvBF..72..205B. doi:10.1007/s10641-004-1480-1. S2CID 7750210.
  6. ^ "Mayaheros urophthalmus – Maya Cichlide". AquaInfo. Retrieved 30 December 2021.
  7. ^ "Mayaheros beani". AquaInfo. Retrieved 30 December 2021.
  8. ^ "Researchers aim to boost production of two native fish species in Mexico". AquaFish, Oregon State University. 27 June 2021. Retrieved 29 December 2021.
  9. ^ Martinez-Cardenas, L.; Valdez-Hernández, E.F.; González-Díaz, A.A.; Soria-Barreto, M.; Castañeda-Chavez, M.R.; Ruiz-Velazco, J.M.; Peña-Messina, E.; Robles-Bermudez, A. (2014). "Preliminary observations on Cichlasoma beani in culture conditions". Lat. Am. J. Aquat. Res. 43 (3): 639–643. doi:10.3856/vol42-issue3-fulltext-20.
  10. ^ Hubbs, C.L. (1938). "Fishes from the caves of Yucatan". Carnegie Institution of Washington Publications. 491: 261–295.
  11. ^ a b c Barrientos-Medina, R.C. (2005), Estado taxonómico de la mojarra rayada "Cichlasoma" urophthalmus Günther, 1862 (Teleostei: Cichlidae), El Colegio de la Frontera Sur y la Universidad Autónoma de Yucatán, Chetumal, Quintana Roo
  12. ^ Barrientos-Medina, R.C. (8 March 2003). "The Mayan cichlid, 'Cichlasoma' urophthalmus: An Overview". CichlidRoom. Retrieved 30 December 2021.
  13. ^ Burkhead, N.M. (2012). "Extinction Rates in North American Freshwater Fishes, 1900–2010". BioScience. 62 (9): 798–808. doi:10.1525/bio.2012.62.9.5. S2CID 86188840.
  14. ^ "Neopterygii (New-Finned Fish)". recentlyextinctspecies.com. Retrieved 30 January 2021.
  15. ^ "Cichlasoma urophthalmum (Mayan cichlid)". CABI - Invasive Species Compendium. Retrieved 30 December 2021.
  16. ^ Ordoñez, J.F.F.; Asis, A.M.J.M.; Catacutan, B.J.; Pena, J.d.; Santos, M.D. (2015). "First report on the occurrence of invasive black-chin tilapia Sarotherodon melanotheron (Ruppell, 1852) in Manila Bay and of Mayan cichlid Cichlasoma urophthalmus (Gunther, 1892) in the Philippines". BioInvasions Records. 4 (2): 115–124. doi:10.3391/bir.2015.4.2.08.
  17. ^ a b c Harrison, E.; Trexler, J.C.; Collins, T.M.; Vazquez-Domınguez, E.; Razo-Mendivil, U.; Matamoros, W.A.; Barrientos, C. (2014). "Genetic Evidence for Multiple Sources of the Non-Native Fish Cichlasoma urophthalmus (Günther; Mayan Cichlids) in Southern Florida". PLOS ONE. 9 (9): 1–12. Bibcode:2014PLoSO...9j4173H. doi:10.1371/journal.pone.0104173. PMC 4153574. PMID 25184569.
  18. ^ a b c Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Mayaheros". Catalog of Fishes. California Academy of Sciences. Retrieved 29 December 2021.
  19. ^ a b Kullander, S.O. (2003). "Family Cichlidae (Cichlids)". In Reis, R.E.; Kullander, S.O.; Ferraris, C.J. Jr. (eds.). Check List of the Freshwater Fishes of South and Central America. Edipucrs, Porto Alegre. pp. 605–654. ISBN 978-8574303611.
  20. ^ Ride, W.D.L.; Cogger, H.G.; Dupuis, C.; Kraus, O.; Minelli, A.; Thompson, F.C.; Tubbs, P.K., eds. (31 December 1999). "Article 8. What constitutes published work". International Code of Zoological Nomenclature (4 ed.). Retrieved 29 December 2021.
  21. ^ a b Miller, R.R. (2003). Freshwater fishes of México. University of Chicago Press, Chicago. ISBN 9780226526041.
  22. ^ Morgenstern, P. (2018). "Fishes collected by Emanuel Ritter von Friedrichsthal in Central America between 1838–1841". Vertebrate Zoology. 68 (3): 253–267. doi:10.3897/vz.68.e31614. S2CID 54074416.
  23. ^ a b Barrientos-Villalobos, J.; Schmitter-Soto, J.J.; Espinosa de los Monteros, A.J. (2018). "Several Subspecies or Phenotypic Plasticity? A Geometric Morphometric and Molecular Analysis of Variability of the Mayan Cichlid Mayaheros urophthalmus in the Yucatan". Copeia. 106 (2): 268–278. doi:10.1643/CI-17-657. S2CID 90809586.
  24. ^ a b Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Mayaheros". FishBase. December 2021 version.


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