Klassifizierung / Names
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Perciformes/Percoidei (Perchs) >
Percidae (Perches) > Etheostomatinae
Etymology: Percina: Latin, diminutive of perch = perch (Ref. 45335); williamsi: Named after James D. Williams, a contemporary ichthyologist, malacologist and natural historian extraordinaire.
Eponymy: Dr James ‘Jim’ David Williams (d: 1941) is a biologist and conservationist who worked in the Department of the Interior at the US Florida Fish & Wildlife Service and US Geological Survey (1974–2006), Florida Fish & Wildlife Conservation Commission [...] (Ref. 128868), visit book page.
Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet
Ökologie
; süßwasser benthopelagisch. Subtropical
North America: restricted to the upper Tennessee River drainage of Tennessee, Virginia and North Carolina, USA.
Größe / Gewicht / Alter
Geschlechtsreife: Lm ?  range ? - ? cm
Max length : 9.1 cm SL (female)
Kurzbeschreibung
Bestimmungsschlüssel | Morphologie | Morphometrie
Rückenflossenstacheln (insgesamt) : 11 - 16; Rückenflossenweichstrahlen (insgesamt) : 12 - 13; Afterflossenstacheln: 2; Wirbelzahl: 44 - 45. Distinguished from all congeners, except Percina macrocephala, by having a sickle-shaped suborbital bar and a black bar subtending a medial black spot on the caudal-fin base. Differs from Percina macrocephala by having larger scales (usually 24-26 scales around the caudal peduncle vs. 27-31), 21-23 transverse scales (vs. 23-26), and 70-77 lateral scales (vs. 76-86). Has values for the combination of caudal peduncle, transverse and lateral scales and lateral scales usually 120-129 (vs. 128-141); has shorter snout on average; snout ranges from 20-28% of HL compared to 24-31 in Percina macrocephala (Ref. 75766).
Body shape (shape guide): elongated.
Adfults inhabit flowing pools over rocky, sandy or silty substrates in clear creeks or small rivers (Ref. 75766). They occur most often near woody debris, vegetation such as water willow, or large boulders (Ref. 75766). Spawning takes place in gravel shoals in later winter (Ref. 75766). Migratory behaviour is undetermined (Ref. 126106).
Lebenszyklus und Paarungsverhalten
Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven
Page, L.M. and T.J. Near, 2007. A New darter from the upper Tennessee River drainage related to Percina macrocephala (Percidae: Etheostomatinae). Copeia 2007(3):605-613. (Ref. 75766)
IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))
Verwundbar (VU) (B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v)); Date assessed: 20 April 2012
Bedrohung für Menschen
Harmless
Nutzung durch Menschen
Tools
Zusatzinformationen
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Internet Quellen
Schätzungen auf der Grundlage von Modellen
Phylogenetischer Diversitätsindex (Ref. 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00575 (0.00270 - 0.01228), b=3.13 (2.95 - 3.31), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Trophische Ebene (Ref. 69278) |
3.4 ±0.4 se; based on size and trophs of closest relatives |
Widerstandsfähigkeit (Ref. 120179) |
hoch, Verdopplung der Population dauert weniger als 15 Monate. (Preliminary K or Fecundity.). |
Anfälligkeit der Fischerei (Ref. 59153) |
Low vulnerability (25 of 100). 🛈 |