Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/61431

TitleShow your beaks and we tell you what you eat: Different ecology in sympatric Antarctic benthic octopods under a climate change context
Author(s)Matias, R. S.
Gregory, S.
Ceia, F. R.
Baeta, A.
Seco, J.
Rocha, M. S.
Fernandes, Emanuel Mouta
Reis, R. L.
Silva, Tiago José Quinteiros Lopes Henriques
Pereira, E.
Piatkowski, U.
Ramos, J. A.
Xavier, J. C.
KeywordsBiomaterials
Cephalopods
Mercury
South Georgia
Stable isotopes
Sympatry
Issue dateSep-2019
PublisherElsevier
JournalMarine Environmental Research
CitationMatias R. S., Gregory S., Ceia F. R., Baeta A., Seco J., Rocha M. S., Fernandes E. M., Reis R. L., Silva T. H., Pereira E., Piatkowski U., Ramos J. A., Xavier J. C. Show your beaks and we tell you what you eat: Different ecology in sympatric Antarctic benthic octopods under a climate change context, Marine Environmental Research, Vol. 150, pp. 104757, doi:10.1016/j.marenvres.2019.104757, 2019
Abstract(s)Sympatry can lead to higher competition under climate change and other environmental pressures, including in South Georgia, Antarctica, where the two most common octopod species, Adelieledone polymorpha and Pareledone turqueti, occur side by side. Since cephalopods are typically elusive animals, the ecology of both species is poorly known. As beaks of cephalopods are recurrently found in top predator's stomachs, we studied the feeding ecology of both octopods through the evaluation of niche overlapping and specific beak adaptations that both species present. A multidisciplinary approach combining carbon (δ13C) and nitrogen (δ15N) stable isotope signatures, mercury (Hg) analysis and biomaterials' engineering techniques was applied to investigate the beaks. An isotopic niche overlap of 95.6% was recorded for the juvenile stages of both octopod species, dropping to 19.2% for the adult stages. Both A. polymorpha and P. turqueti inhabit benthic ecosystems around South Georgia throughout their lifecycles (δ13C: −19.21 ± 1.87‰, mean ± SD for both species) but explore trophic niches partially different during adult life stages (δ15N: 7.01 ± 0.40‰, in A. polymorpha, and 7.84 ± 0.65‰, in P. turqueti). The beaks of A. polymorpha are less dense and significantly less stiff than in P. turqueti. Beaks showed lower mercury concentration relative to muscle (A. polymorpha - beaks: 0.052 ± 0.009  μg g−1, muscle: 0.322 ± 0.088  μg g−1; P. turqueti - beaks: 0.038 ± 0.009  μg g−1; muscle: 0.434 ± 0.128  μg g−1). Overall, both octopods exhibit similar habitats but different trophic niches, related to morphology/function of beaks. The high Hg concentrations in both octopods can have negative consequences on their top predators and may increase under the present climate change context.
TypeArticle
URIhttp://hdl.handle.net/1822/61431
DOI10.1016/j.marenvres.2019.104757
ISSN0141-1136
e-ISSN1879-0291
Publisher versionhttps://doi.org/10.1016/j.marenvres.2019.104757
Peer-Reviewedyes
AccessOpen access
Appears in Collections:3B’s - Artigos em revistas/Papers in scientific journals

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