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Isozyme criteria in the testing of phyletic relationships between species of Gobius and related eastern Atlantic‐Mediterranean genera (Teleostei: Gobüdae)
Author(s) -
McKay S. I.,
Miller P. J.
Publication year - 1991
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1991.tb05092.x
Subject(s) - biology , phyletic gradualism , cladistics , zoology , sister group , teleostei , taxon , genetic distance , isozyme , phylogenetic tree , ecology , genetic variation , genetics , clade , fish <actinopterygii> , fishery , gene , biochemistry , enzyme
Horizontal starch gel electrophoresis was employed to investigate allozyme variation at 19 isozyme loci, in nine closely‐related Atlantic‐Mediterranean gobiid fish species, to assess genetic relationships, and to compare this with a phyletic hypothesis based on morphological apo‐morphies. The species examined were Gobius niger, G. auratus, G. cruentatus, G. paganellus, Mauligobius maderensis, Zosterisessor ophiocephalus, Thorogobius ephippiatus, Padogobius martensii and P. nigricans . Various phenetic and cladistic analyses were performed on isozyme and morphological data. The phenetic and cladistic results from morphological data, and the cladistic results from isozyme data, were largely comparable, with P. martensü and P. nigricans forming a sister group to all the other taxa, species of Cobius forming a crown group within the latter, and stem lines formed by Mauligobius, Zosterisessor and Thorogobius , respectively. The isozymic estimates of genetic distance differed from these chiefly in the relative positions of Zosterisessor and G. auratus , which appear less similar to other species of Gohius. G. auratus shows many alleles which are unique within the genus Gobius ; possible explanations for this are put forward. The position of nigricans as congeneric with Padogobius martensü is confirmed by both phenetic and cladistic analyses of isozyme data.