Abstract:
:The sedentary, predatory characin Hoplias malabaricus has one of the widest distributions of freshwater fishes in South America and is characterized by seven karyomorphs (A-G) that occur in sympatric and allopatric populations. Karyotypical patterns of variation in wild populations have been interpreted as evidence of multiple lineages within this nominal species, a possibility that may limit the validity of experimental data for particular karyomorphs. This study used the phylogeographic and genealogical concordance between cytogenetic (N = 49) and molecular (mitochondrial DNA) (N = 73) data on 17 samples, collected in 12 basins from south-eastern and north-eastern Brazil, to assess the systematic value of cytogenetic data. Cytogenetic patterns show a sex chromosome system in the 2n = 40F karyomorph. Molecular and cytogenetic data indicate a long, independent evolutionary history of karyomorphs and a coastal origin of continental populations in south-eastern Brazil. The lack of fit with molecular clock expectations of divergence between groups is likely to be due to strong demographic fluctuations during the evolution of this species complex. The results indicate that karyotypical identification provides a reliable baseline for placing experimental studies on Hoplias spp. in a phylogenetic context.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Santos U,Völcker CM,Belei FA,Cioffi MB,Bertollo LA,Paiva SR,Dergam JAdoi
10.1111/j.1095-8649.2009.02489.xsubject
Has Abstractpub_date
2009-12-01 00:00:00pages
2326-43issue
9eissn
0022-1112issn
1095-8649pii
JFB2489journal_volume
75pub_type
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