Microsatellite analysis reveals genetic differentiation between year-classes in the icefish <Emphasis Type="Italic">Chaenocephalus aceratus</Emphasis> at South Shetlands and Elephant Island |
| |
Authors: | Chiara Papetti Emanuele Susana Mario La Mesa Karl-Hermann Kock Tomaso Patarnello Lorenzo Zane |
| |
Institution: | (1) Department of Biology, University of Padova, via U. Bassi 58/B, 35121 Padova (PD), Italy;(2) Department of Public Health, Comparative Pathology and Veterinary Hygiene, University of Padova, Agripolis, via Romea 16, 35020 Legnaro (Pd), Italy;(3) Institute of Marine Science (CNR-ISMAR) Marine Fishery Section, Largo Fiera della Pesca, 1, 60125 Ancona (An), Italy;(4) Institut für Seefischerei, Bundesforschungsanstalt für Fischerei, Palmaille 9, 22767 Hamburg, Germany |
| |
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.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
| |
Keywords: | Chaenocephalus aceratus Notothenioidei By-catch species Microsatellites Stock Sex Age Year-classes Cohorts |
本文献已被 SpringerLink 等数据库收录! |
|