Owens tui chub

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Owens tui chub
Owens Tui Chub.jpg

Endangered (ESA)
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Leuciscidae
Genus: Siphateles
Species:
S. bicolor
Subspecies:
S. b. snyderi
Trinomial name
Siphateles bicolor snyderi
(R. R. Miller, 1973)
Synonyms

Gila bicolor snyderi

The Owens tui chub (Siphateles bicolor snyderi) was described in 1973 as a subspecies of tui chub endemic to the Owens River Basin in Eastern California, United States.[1][2] The Owens tui chub is distinguished from its closest relative, the , by scales with a weakly developed or absent basal shield, 13 to 29 lateral and apical radii, also by the structure of its pharyngeal arches, the number of anal fin rays, 10 to 14 gill rakers, and 52 to 58 lateral line scales.[1][2] Dorsal and lateral coloration varies from bronze to dusky green, grading to silver or white on the belly. It may reach a total length of 30 centimetres (12 in). Owens tui chub are believed to be derived from Lahontan Basin tui chub that entered the Owens Basin from the north during the Pleistocene Epoch.[1][2][3]

Owens tui chub were historically common and occupied all valley-floor wetlands near the Owens River in Inyo and Mono counties. Owens suckers, Owens speckled dace, and Owens pupfish have a similar distribution to the Owens tui chub.[1] Analysis of microsatellite DNA shows that Owens tui chub in tributaries of Mono Lake and the Owens River are now hybridized with Lahontan tui chub. Genetically pure Owens tui chub occur in water that is cut off from the Owens River, such as at near Reds Meadow; springs near the Hot Creek Fish Hatchery in Mammoth Lakes, California;[4] and artificial ponds at the White Mountain Research Center and at Mule Spring in Inyo County.[5]

Typical habitat of the Owens tui chub

Owens tui chubs prefer pool habitats with low current velocities and dense aquatic vegetation that provide adequate cover and habitat for insect food items.[1][6] Owens tui chubs feed mainly by gleaning and grazing among submerged vegetation. Its diet varies seasonally; the dominant items in its diet are chironomid larvae and algae in spring, chironomid larvae in summer, hydroptilid caddisflies in fall, and chironomid larvae in winter.[7][8][9] Spawning occurs from late winter to early summer at spring habitats,[8] with spawning likely triggered by day length. In riverine and lacustrine or lake-like habitats where water temperatures fluctuate seasonally, the Owens tui chub spawns in spring and early summer, with spawning triggered by warming water temperatures.[7] Females may produce more than 10,000 eggs.[10] Tui chubs may reach sexual maturity at 2 years,[7] and may live more than 30 years.[1][11]

References[]

  1. ^ a b c d e f Public Domain This article incorporates public domain material from the United States Fish and Wildlife Service document: U.S. Fish and Wildlife Service (1998). "Owens Basin Wetland and Aquatic Species Recovery Plan lnyo and Mono Counties, California" (PDF). Portland, Oregon.
  2. ^ a b c Miller, RR (1973). "Two new fishes, Gila bicolor snyderi and Catostomus fumeiventris from the Owens River basin, California". Occasional Papers of the Museum of Zoology, University of Michigan. 667: 1–19.
  3. ^ Smith, GR (1978). "Biogeography of intermountain fishes". Great Basin Naturalist Memoirs. 2: 17–42.
  4. ^ Chen, Yongjiu; Parmenter, Steve; May, Bernie (2007). "Introgression Between Lahontan and Endangered Owens Tui Chubs, and Apparent Discovery of a New Tui Chub in the Owens Valley, California". Conservation Genetics. 8: 221–238. doi:10.1007/s10592-006-9164-3. S2CID 22985910.
  5. ^ "Owens Tui Chub (Siphateles bicolor snyderi)" (PDF). DRECP. 2014.
  6. ^ McEwan, D (1991). "Microhabitat Selection of the Owens Tui Chub, Gila Bicolor Snyderi, in the Hot Creek Headsprings, Mono County, California". Desert Fishes Council Proceedings. 20: 11–23.
  7. ^ a b c Public Domain This article incorporates public domain material from the United States Fish and Wildlife Service document: "Owens Tui Chub (Siphateles bicolor snyderi = Gila bicolor snyderi) 5-Year Review: Summary and Evaluation" (PDF).
  8. ^ a b McEwan, D (1990). Utilization of aquatic vegetation and some aspects of life history of the Owens tui chub (Gila bicolor snyderi) in the Hot Creek head springs, Mono County, California (M.S. thesis). California State University, Sacramento.
  9. ^ Geologica (2003). "Evaluation of Owens tui chub habitat, Long Valley Caldera, Mono County, California" (PDF). County of Mono, Department of Economic Development and Special Projects.
  10. ^ Kimsey, JB (1954). "The life history of the tui chub, Gila bicolor (Girard), from Eagle Lake, California". California Fish and Game. 40: 395–410.
  11. ^ Scoppettonne, GG (1988). "Growth and longevity of cui-ui and longevity of other catostomids and cyprinids in western North America". Transactions of the American Fisheries Society. 117 (3): 301–307. doi:10.1577/1548-8659(1988)117<0301:GALOTC>2.3.CO;2.
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