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In situ observation of Antarctic toothfish (Dissostichus mawsoni) is challenging as they typically live at depths greater than 500 m, in dark and ice-covered Antarctic waters. Searching for adequate methodologies to survey Antarctic toothfish in their habitat, we tested a miniaturized Baited Remote Underwater Video camera (BRUV), deployed through holes drilled in the sea ice in the Ross Sea region, over three field seasons. In 2015 three BRUVs were deployed at McMurdo Sound, and paired with a vertical longline sampling. In 2017, three opportunistic deployments were performed at Terra Nova Bay. In 2018 seven deployments at Terra Nova Bay provided preliminary data on the habitat preferences of the species. The design and configuration of the mini-BRUV allowed to collect high-quality video imagery of 60 Antarctic toothfish in 13 deployments from the fast sea ice. The behaviour of fish at the bait, intra-species interactions, and potential biases in individual counting were investigated, setting baselines for future studies on the abundance and distribution of Antarctic toothfish in sea-ice covered areas. This work represents the first step towards the development of protocols for non-extractive monitoring of the Antarctic toothfish in the high-Antarctica coastal shelf areas, of great value in the Ross Sea region where the largest MPA of the world has recently been established.
Davide Di Blasi; Simonepietro Canese; Erica Carlig; Steven Parker; Eva Pisano; Marino Vacchi; Laura Ghigliotti. The Challenge to Observe Antarctic Toothfish (Dissostichus mawsoni) under Fast Ice. Journal of Marine Science and Engineering 2021, 9, 255 .
AMA StyleDavide Di Blasi, Simonepietro Canese, Erica Carlig, Steven Parker, Eva Pisano, Marino Vacchi, Laura Ghigliotti. The Challenge to Observe Antarctic Toothfish (Dissostichus mawsoni) under Fast Ice. Journal of Marine Science and Engineering. 2021; 9 (3):255.
Chicago/Turabian StyleDavide Di Blasi; Simonepietro Canese; Erica Carlig; Steven Parker; Eva Pisano; Marino Vacchi; Laura Ghigliotti. 2021. "The Challenge to Observe Antarctic Toothfish (Dissostichus mawsoni) under Fast Ice." Journal of Marine Science and Engineering 9, no. 3: 255.
The ice cod Arctogadus glacialis (Peters, 1872) is one of the few fish species endemic to the Arctic. With a circumpolar distribution, the species is confined to the fjords and shelves of the Arctic seas. Biological information on A. glacialis is scarce, with genomic information restricted to microsatellites. Within the frame of the TUNU-Programme: Arctic Ocean Fishes—Diversity, Adaptation and Conservation, we studied A. glacialis at the chromosomal level to explore fish diversity and evolutionary aspects. The analysis of over 50 individuals from the Northeast Greenland fjords between latitudes 71°09′ N and 76°42′ N revealed a remarkable intraspecific diversity epitomized by chromosome numbers spanning from 28 to 33, the occurrence of putative B chromosomes, and diversified patterns of distribution of heterochromatin and rDNAs. The number of B chromosomes followed a latitudinal gradient from 0–2 in the north to 2–5 in the south. Considering the benthic and rather stationary life history of this species, the observed chromosomal differences might have arisen independently, possibly driven and/or fostered by the dynamics of repetitive sequences, and are being fixed in relatively isolated fjord populations. The resulting latitudinal cline we observe today might have repercussions on the fate of local populations facing the ongoing climate-driven environmental changes.
Laura Ghigliotti; Jørgen S. Christiansen; Erica Carlig; Davide Di Blasi; Eva Pisano. Latitudinal Cline in Chromosome Numbers of Ice Cod A. glacialis (Gadidae) from Northeast Greenland. Genes 2020, 11, 1515 .
AMA StyleLaura Ghigliotti, Jørgen S. Christiansen, Erica Carlig, Davide Di Blasi, Eva Pisano. Latitudinal Cline in Chromosome Numbers of Ice Cod A. glacialis (Gadidae) from Northeast Greenland. Genes. 2020; 11 (12):1515.
Chicago/Turabian StyleLaura Ghigliotti; Jørgen S. Christiansen; Erica Carlig; Davide Di Blasi; Eva Pisano. 2020. "Latitudinal Cline in Chromosome Numbers of Ice Cod A. glacialis (Gadidae) from Northeast Greenland." Genes 11, no. 12: 1515.