Genetic diversity and structure of Euphausia superba in the South Shetland Islands using the mitochondrial ND6 gene

Crustaceana ◽  
2019 ◽  
Vol 92 (11-12) ◽  
pp. 1295-1309
Author(s):  
Yao Dong ◽  
Guangrui Qi ◽  
Chunlei Feng ◽  
Wei Wang ◽  
Fengying Zhang ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Demographic History ◽  
Scientific Information ◽  
Euphausia Superba ◽  
South Shetland Islands ◽  
Sudden Expansion ◽  
The South ◽  
Shetland Islands ◽  
Fisheries Resources ◽  
Genetic Diversity And Structure

Abstract Euphausia superba is an abundant element in the marine plankton on the planet. Despite substantial research on this species, there is no comprehensive understanding of the population genetics of E. superba yet. In this study, the ND6 gene was used to assess the genetic variation in E. superba. In the South Shetland Islands, the population of E. superba shows abundant genetic variation, but we found a lack of genetic structure. An analysis of the demographic history suggested that a sudden expansion has been responsible for its high biomass. Our study could not only broaden our comprehension of E. superba, but also provide more scientific information on fisheries resources exploitation, biodiversity conservation and the maintenance of a proper ecological balance.

Stable isotopes identify an ontogenetic niche expansion in Antarctic krill (Euphausia superba) from the South Shetland Islands, Antarctica

2013 ◽  
Vol 160 (6) ◽  
pp. 1311-1323 ◽  
Author(s):  
Michael J. Polito ◽  
Christian S. Reiss ◽  
Wayne Z. Trivelpiece ◽  
William P. Patterson ◽  
Steven D. Emslie
Keyword(s):  
Stable Isotopes ◽  
Antarctic Krill ◽  
Euphausia Superba ◽  
South Shetland Islands ◽  
The South ◽  
Niche Expansion ◽  
Shetland Islands ◽  
Ontogenetic Niche ◽  
Antarctic Krill Euphausia Superba

scholarly journals Variations in the biomass of Antarctic krill (Euphausia superba) around the South Shetland Islands, 1996–2006

2008 ◽  
Vol 65 (4) ◽  
pp. 497-508 ◽  
Author(s):  
Christian S. Reiss ◽  
Anthony M. Cossio ◽  
Valerie Loeb ◽  
David A. Demer
Keyword(s):  
Time Series ◽  
Antarctic Krill ◽  
Strong Support ◽  
Euphausia Superba ◽  
Target Strength ◽  
South Shetland Islands ◽  
Species Discrimination ◽  
The South ◽  
Shetland Islands ◽  
Antarctic Krill Euphausia Superba

Abstract Reiss, C. S., Cossio, A. M., Loeb, V., and Demer, D. A. 2008. Variations in the biomass of Antarctic krill (Euphausia superba) around the South Shetland Islands, 1996–2006. – ICES Journal of Marine Science, 65: 497–508. The time-series of acoustically surveyed Antarctic krill (Euphausia superba) biomass near the South Shetland Islands (SSI) between 1996 and 2006 is re-estimated using a validated physics-based model of target strength (TS), and a species-discrimination algorithm based on the length-range of krill in plankton samples to identify krill acoustically, derived from TS-model predictions. The SSI area is surveyed each austral summer by the US Antarctic Marine Living Resources Program, and the acoustic data are used to examine trends in krill biomass and to assess the potential impact of fishing to the reproductive success of land-based predators (seals and penguins). The time-series of recomputed biomass densities varies greatly from that computed using an empirical log-linear TS-model and fixed-ranges of differences in volume–backscattering strengths (ΔSv), conventionally used to identify krill acoustically. The new acoustic estimates of biomass are significantly correlated with both proportional recruitment and krill abundance estimated from zooplankton samples. Two distinct peaks in biomass (1996 and 2003) are in accord with recruitment events shown by net-based krill time-series. The foundation for the new TS-model and the associated krill-discrimination algorithm, coupled with the agreement between acoustic- and net-survey results, provides strong support for the use of the new analytical technique. Variable biases in the re-estimated krill biomass have been greatly reduced. However, survey variability increased as a result of the increased rejection of acoustic backscatter previously attributed to krill. Management of Southern Ocean krill stocks based on a precautionary approach may therefore result in decreased allocations of krill, given its dependence on the variability of survey estimates.

scholarly journals Comparative analysis of the diet of Arctocephalus gazella (Pinnipedia), at two localities of the South Shetland Islands, with emphasis on the fish component

2021 ◽  
Vol 111 ◽  
Author(s):  
Mariana Descalzo ◽  
Gustavo A. Daneri ◽  
Javier Negrete ◽  
Aldo Corbalán ◽  
Esteban Barrera-Oro
Keyword(s):  
Negative Impact ◽  
Feeding Habits ◽  
Euphausia Superba ◽  
South Shetland Islands ◽  
Arctocephalus Gazella ◽  
The South ◽  
Scotia Sea ◽  
Shetland Islands ◽  
Important Prey ◽  
Fur Seals

ABSTRACT We studied the diet of non-breeding male Antarctic fur Seals Arctocephalus gazella (Peters, 1875) at two different localities of the South Shetland Islands: Stranger Point, King George Island/Isla 25 de Mayo and Duthoit Point, Nelson Island, by the analysis of 65 faecal samples collected in February 2012. Overall, Antarctic krill Euphausia superba (Dana, 1850) and fish were the main prey taxa followed by penguins and cephalopods. Myctophids were dominant among fish; Gymnoscopelus nicholsi (Gilbert, 1911) was the most important prey species at both sampling sites, followed by Electrona antarctica (Gunther, 1878) at Stranger Point and by the nototheniid Pleuragramma antarctica (Boulenger, 1902) at Duthoit Point. The relative similarity found in the dietary composition of fur seals from both locations suggest they might have been sharing common feeding areas. Our results were compared with those reported in the literature for different localities of the South Shetland Islands and the Scotia Sea region. The absence of formerly harvested demersal notothenioid species in the diet of fur seals may reflect the negative impact that commercial fisheries had on some fish populations and supports the importance of implementing long-term monitoring studies on the feeding habits of A. gazella in the area.

scholarly journals Small unmanned aerial vehicles for aeromagnetic surveys and their flights in the South Shetland Islands, Antarctica

Polar Science ◽  
2014 ◽  
Vol 8 (4) ◽  
pp. 342-356 ◽  
Author(s):  
Minoru Funaki ◽  
Shin-Ichiro Higashino ◽  
Shinya Sakanaka ◽  
Naoyoshi Iwata ◽  
Norihiro Nakamura ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
South Shetland Islands ◽  
The South ◽  
Shetland Islands ◽  
Aerial Vehicles
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