Impact of submarine hydrothermal vents on the metal composition of krill and its excretion products |
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| Authors: | A. Tovar-Sanchez C.M. Duarte S. Hernández-León S.A. Sañudo-Wilhelmy |
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| Affiliation: | 1. Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, 15785 Santiago de Compostela, Spain;2. Departamento de Geología, Universidad de Oviedo, 33600 Mieres, Spain;3. Departamento de Geología, Universidad de Alcalá, Alcalá de Henares, 28871 Madrid, Spain;4. Instituto de Geociências, Universidade Estadual de Campinas, CP 6152, 13083-970 Campinas — SP, Brazil;5. Departamento de Biología, Universidad Autónoma de Madrid, 28049 Madrid, Spain;1. Portuguese Institute of Sea and Atmosphere (IPMA), Av. de Brasília, 1449-006 Lisboa, Portugal;2. Centro de Química Estrutural, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal;3. INACH, Chilean Antarctic Institute, Punta Arenas, Chile;4. Arctic and Antarctic Research Institute, Saint-Petersburg, Russia;5. British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB30ET, UK;6. Jena University, Jena, Germany |
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| Abstract: | ![]()
We have measured the metal composition and estimated the excretion rate of trace elements (Ag, Cd, Co, Cu, Ni, Pb, V and Zn) by Antarctic krill (Euphausia superba) in three locations (two located within a submarine hydrothermal vent field and one away from it) along the Antarctic Peninsula region of the Southern Ocean. Results indicated that krill excreted large amounts of Ag, Cu, Pb and Zn, (range: 1.9–41.2 pmol Ag g DW? 1 h? 1, 15.3–26.8 nmol Cu g DW? 1 h? 1, 308.7–1118.3 pmol Pb g DW? 1 h? 1 and 24.4–76.5 nmol Zn g DW? 1 h? 1), compared with the non-significant or undetectable release rates of Cd, Co, Ni and V. The metal composition of the excreted material from krill collected in the area of hydrothermal activity was similar to the metal composition reported for suspended particles emitted from those vents. Our results suggest that krill recycling of Ag, Cu, Pb and Zn could potentially influence trace metal concentrations in the water column of the Bransfield region of the Southern Ocean, and that the original source of metals to these waters may be hydrothermal vents. |
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