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Cytogenetic features of Notothenia angustata Hutton, 1875, an Antarctic fish living in non-Antarctic waters



Cytogenetic features of Notothenia angustata Hutton, 1875, an Antarctic fish living in non-Antarctic waters







The research on fish of the suborder Notothenioidei has produced valuable advancement on Antarctic evolutionary biology. The major features of the evolutionary history of these fishes have been established as well as the molecular basis for cold adaptation, and the Antarctic continental shelf is gaining visibility as an important evolutionary site. However few is still known about fluctuations or migrations ofthe species, about sites of radiations and events ofspeciation after the arising of cold adaptation, that have led to the present taxonomic composition and geographical distribution, and that are possibly related to cycles of cooling of the Southern Ocean. In this contest, species living in sub-Antarctic and cold temperate peri-Antarctic regions are particularly interesting. For instance the nototheniid Notothenia angustata have acquired cold adaptation but inhabits, at present, the cold- temperate waters of New Zealand and South America. In the present paper we report on the main cytogenetic features of N. angustata from New Zealand, with the aim to contribute to a species-specific characterisation and to provide information on the biological history ofthis Antarctic fish living in non-Antarctic waters.

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