Journal Article

Sympatric morphotypes of the restricted‑range Tashan Cave Garra: distinct species or a case of phenotypic plasticity?

Hashemzadeh Segherloo, I., Najafi Chaloshtory, S., Naser, M.D., Yasser, A.G., Tabatabaei, S.N., Piette‑Lauziere, G., Mashtizadeh, A., Elmi, A., Sedighi, O., Changizi, A., Hallerman, E. and Bernatchez

Record Number:
5968
Year:
2022
Journal:
Environmental Biology of Fishes
Pages:
1251-1260
Volume:
105
Abstract:
Abstract Among Tashan cave barb Garra tashanensis inhabiting a small cave in southwest Iran, two mental disc (sucking mouth disc) forms were observed. To assess their phylogenetic relationships, disc-less and disc-bearing individuals were analyzed using mitochondrial cytochrome oxidase subunit I (COI) partial DNA sequences. Both mental disc forms nested within one clade with absolute bootstrap support (BS = 100), and the genetic distances between the disc-bearing and disc-less individuals (0.3–0.8%) were considerably lower than inter-species mtDNA sequence distances reported among members of the genus Garra; further, most species delimitation algorithms used here showed disc-bearing and disc-less Tashan cave barbs to be members of a single taxonomic unit. Hence, the observed mental disc variation was not inferred to be a taxonomic feature or a consequence of character displacement. Instead, it was inferred to be a case of character release to diversify among ecological niches in the limited subterranean habitat or a case of relaxed selection, which should be clarified in detail in follow-up ecological and population genetic studies. Keywords Character displacement · Character release · Garra tashanensis · Tashan Cave · Taxonomic feature
Times Cited:
1
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