Cephalopod beak sections used to trace mercury levels throughout the life of cephalopods: The giant warty squid Moroteuthopsis longimana as a case study

Autor: José C. Xavier, José Seco, João P. Coelho, Paco Bustamante, José P. Queirós, Jim Roberts, Yves Cherel, Eduarda Pereira
Přispěvatelé: Marine and Environmental Sciences Centre (MARE UC), Universidade de Coimbra [Coimbra], LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centro de Estudos do Ambiente e do Mar, Departamento de Biologia, Universidade de Aveiro, Centro de Estudos do Ambiante e do Mar (CESAM), Scottish Oceans Institute, University of St Andrews [Scotland], National Institute of Water and Atmospheric Research [Wellington] (NIWA), British Antarctic Survey (BAS), Natural Environment Research Council (NERC)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Marine Environmental Research
Marine Environmental Research, Elsevier science, 2020, 161, pp.105049. ⟨10.1016/j.marenvres.2020.105049⟩
ISSN: 0141-1136
1879-0291
Popis: International audience; Cephalopods represent an important pathway for mercury transfer through food-webs. Due to the general difficulties in capturing oceanic squid, beaks found in the diet of top predators can be used to study their life-cycles and ecological role. Using upper beaks of the giant warty squid Moroteuthopsis longimana (major prey in the Southern Ocean), we describe a method to assess mercury concentrations along the life of cephalopods through the segmentary analysis of beak sections (i.e. rostrum’s tip and subsections along the hood). Distinct total mercury concentrations in the different subsections support that beaks can be used to study mercury levels in different periods of cephalopods’ life-cycle. Mercury values in the anterior (1.3 to 7.9 μg kg-1 dw) and posterior (7.8 to 12.5 μg kg-1 dw) subsections reflect juvenile and adult stages, respectively. Furthermore, these results confirm that mercury bioaccumulates continuously throughout the individuals’ life, with adults doubling their mercury concentrations to juveniles.
Databáze: OpenAIRE
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