No 1(18) (2019): Ukrainian Antarctic Journal
Articles

Cephalopods in the diet of keystone-species animals in the region of the Argentine Islands Archipelago (West Antarctica)

І. Dykyy
State Institution National Scientific Antarctic Center, Ministry of Education and Science of Ukraine, 16 Taras Shevchenko Blvd., Kyiv, 01601, Ukraine,Ivan Franko National University, 4 Mykhaila Hrushevskoho Str., Lviv, 79005, Ukraine
I. Zahorodnyi
Ivan Franko National University, 4 Mykhaila Hrushevskoho Str., Lviv, 79005, Ukraine
Published December 13, 2019
Keywords
  • Cephalopoda,
  • Antarctica,
  • Argentine Islands Archipelago,
  • keystone-species,
  • feeding

Abstract

Оbjective. The study of diet of keystone-species vertebrates (Nothotenia coriiceps, Phalacrocorax bransfieldensis, Leptonychotes weddellii) in the ecosystem of the Argentine Islands Archipelago. Methods. Biological researches were conducted on Akademik Vernadsky station during wintering in 2006—2007, 2009—2010, 2011—2012, 2019 accordance with tasks of the State Special-Purpose Research Program in Antarctica for 2011–2020. In total, the content of 30 faeces of the L. weddellii, 64 pellets and three stomachs of the Ph. bransfieldensis and 40 stomachs of the N. coriiceps were analyzed. Material was collected at all seasons. Results. The L. weddellii diet is dominated by three squid species Galiteuthis glacialis (39,5%), Brachiotheutis picta (21%) and the fishery species Psychroteuthis glacialis (15.8%). In the diet of Ph. bransfieldensis were found the main four Octopus species such as Adelieledone polimorpha – 20%, Pareledone turqueti – 20%, and Graneledone sp. – 24% and Benthoctopus sp. – 16%, who owns the highest proportion of hits. In the nutrition of N. coriiceps, cephalopods are rarely recorded. Only one species of Octopus has been registered and has been identified only to the Cirroteuthidae family. Conclusions. Found that in the diet of keystone-species vertebrates (N. coriiceps, Ph. bransfieldensis, L. weddellii) in the ecosystem of the Argentine Islands Archipelago there are 13 species of Cephalopods, of which 4 species belong to squid Decapoda and 9 species to octopuses Octopoda (3 species are identified to the genus and one to the family). The findings are important not only to establish the actual status of the Antarctic ecosystem and to conserve biodiversity in the Antarctic region.

References

  1. Casaux, R., Baroni, A., Ramo, A. 2005. The diet of the Weddell Seal Leptonychotes weddellii at the Danco Coast, Antarctic Peninsula. Polar Biol., 25, 1-6. https://doi.org/10.1007/s00300-005-0048-7
  2. Clarke, M.1980. Cephalopoda in the diet of sperm whales of the Southern Hemisphere and their bearing on sperm whale biology. Discov Rep., 37, 1-324.
  3. Clarke, M., MacLeod, N. 1982. Cephalopod remains in the stomachs of eight Weddell seals. Br. Antarc. Surv. Bull., 57, 33-40.
  4. Daneri, G.A., Piatkowski, U., Coria, N.R., Carlini, A.R. 1999. Predation on cephalopods by Antarctic fur seals, Arctocephalus gazella, at two localities of the Scotia Arc, Antarctica.Polar Biol., 21, 59-63. https://doi.org/10.1007/s003000050333
  5. Dykyy, I. 2012. The feeding peculiarities of the Antarctic seals in the region of the archipelago of Argentina Islands. Document CCAMLR № WG-EMM-12/P1. 1-9.
  6. Dykyy, I. 2009. The feeding peculiarities of the Antarctic seals in the region of the archipelago of Argentina Islands. Ukrainian Antarctic Journal, 8, 215-223.
  7. Fisher, W., Hureau, J.C. 1985. FAO species identification sheets for fishery purposes. Southern Ocean (Fishing Areas 48, 58 and 88). FAO, 1, 232.
  8. Lipinski, M., Woyciechowski, M. 1981. Cephalopods in the food of Weddell seals from the Admiralty Bay (King George Island, South Shetland Islands). Pol Polar Res., 2(3-4), 163-167.
  9. Okutani, T., Clarke, M. 1985. Identification key and species description for Antarctic squids. BIOMASS Handbook, 21, 57.
  10. Xavier, J.C., Cherel, Y. 2009. Cephalopod Beak Guide for The Southern Ocean. British Antarctic Survey. Cambridge, UK. 129.
  11. Zahorodnyi, I., Dykyy, I. 2017. The feeding of the Antarctic shag (Phalacrocorax (atriceps) bransfieldensis) in the region of the archipelago of Argentina Islands (Western Antarctica). VIII International Antarctic Conference Dedicated to the 25th anniversary of Ukraine's accession to the Antarctic Treaty (Kyiv, Ukraine, May 16-18, 2017). Kyiv, 54-55.