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Microsatellite analysis reveals genetic differentiation between year-classes in the icefish Chaenocephalus aceratus at South Shetlands and Elephant Island

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Abstract

Chaenocephalus aceratus is one of the most abundant Antarctic icefish species in the Atlantic sector and has been a by-catch species in the fishery for mackerel icefish, Champsocephalus gunnari, between the mid-1970s and mid-1980s at South Georgia, South Orkney, and South Shetland Islands. The species became the target of the fishery in particular seasons, such as at South Georgia in 1977/78. In our paper, we report results on genetic differentiation for 11 microsatellite loci in C. aceratus samples collected at the South Shetlands and Elephant Island. This study represents the first report on microsatellite variability of an icefish species. Our results support the evidence from previous studies on differences in infestation patterns of parasites that a single panmictic population of C. aceratus exists, spanning the two sampling sites separated by about 100 km. Moreover, our study indicates the presence of a significant genetic differentiation between individual year-classes pointing out the existence of dynamic processes acting at the population genetic level, according to recent results for broadly distributed marine species. Both small effective population size and immigration from unsampled differentiated stocks may be at the base of the differentiation found in C. aceratus.

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Acknowledgments

This work was supported by the Italian Antarctic Research Program (PNRA). We thank Alfred Wegener Institut für Polar- und Meeresforschung that provided us the opportunity to collect samples during “ANT-XIX IV 2002” Polarstern cruise.

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Authors and Affiliations

  1. Department of Biology, University of Padova, via U. Bassi 58/B, 35121, Padova (PD), Italy

    Chiara Papetti, Emanuele Susana & Lorenzo Zane

  2. Department of Public Health, Comparative Pathology and Veterinary Hygiene, University of Padova, Agripolis, via Romea 16, 35020, Legnaro (Pd), Italy

    Tomaso Patarnello

  3. Institute of Marine Science (CNR-ISMAR) Marine Fishery Section, Largo Fiera della Pesca, 1, 60125, Ancona (An), Italy

    Mario La Mesa

  4. Institut für Seefischerei, Bundesforschungsanstalt für Fischerei, Palmaille 9, 22767, Hamburg, Germany

    Karl-Hermann Kock

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  1. Chiara Papetti
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  2. Emanuele Susana
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  4. Karl-Hermann Kock
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Correspondence to Lorenzo Zane.

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Papetti, C., Susana, E., La Mesa, M. et al. Microsatellite analysis reveals genetic differentiation between year-classes in the icefish Chaenocephalus aceratus at South Shetlands and Elephant Island. Polar Biol 30, 1605–1613 (2007). https://doi.org/10.1007/s00300-007-0325-8

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