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Cephalopod fauna of the Pacific Southern Ocean using Antarctic toothfish (Dissostichus mawsoni) as biological samplers and fisheries bycatch specimens
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Orientador(es)
Resumo(s)
Cephalopods are an important component of Southern Ocean food webs but studies analysing their habitat and
trophic ecology are scarce. Here, we use the Antarctic toothfish Dissostichus mawsoni as a biological sampler of
Southern Ocean’s cephalopods in the Ross, Amundsen, and D’Urville Seas. Ten cephalopod taxa were identified
in the diet of the Antarctic toothfish, with Pareledone turqueti and Moroteuthopsis longimana being the only species
present in all the three studied areas. DNA analysis conducted on squid flesh samples allowed identification of
eight and two specimens of Mesonychoteuthis hamiltoni and M. longimana, respectively, proving this technique as a
potential tool to improve the knowledge of cephalopods biodiversity and biogeography in the Southern Ocean.
Stable isotopes were used to compare the habitat (δ13C) and trophic ecology (δ15N) between two life-stages of the
two most abundant squid species (M. longimana and Psychroteuthis glacialis) from the D’Urville Sea (both squid
species) and Amundsen Sea (only P. glacialis). Higher δ13C values in M. longimana suggest that this species inhabits
waters near the Antarctic Polar Front, with incursions into sub-Antarctic waters, whilst P. glacialis spends
its entire life in Antarctic waters. The most recently deposited part of the beak is enriched in 15N suggesting an
increase in trophic level during squid growth. These results give us the first insights into the bathyal distribution
of cephalopods in the Amundsen and D’Urville Seas, as well as into the ontogenetic changes of two of the most
consumed squid species by top predators in this region. Such results are an important step towards improving the
biogeography of Antarctic cephalopods, being of utmost importance to understand the biodiversity, food web
structure, and functioning of this region
Descrição
Palavras-chave
DNA barcoding Amundsen Sea D’Urville Sea Cephalopoda stable isotopes trophic ecology
Contexto Educativo
Citação
Queirós JP, Ramos JA, Cherel Y, Franzitta M, Duarte B, Rosa R, Monteiro F, Figueiredo A, Strugnell JM, Fukuda Y, Stevens DW, Xavier JC (2021). Cephalopod fauna of the Pacific Southern Ocean using Antarctic toothfish (Dissostichus mawsoni) as biological samplers and fisheries bycatch specimens. Deep Sea Research Part I: Oceanographic Research Papers 174: 103571
Editora
Elsevier