Mercury concentrations, biomagnification and isotopic discrimination factors in two seabird species from the Humboldt Current ecosystem.

Autor: Le Croizier G; Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Joel Montes Camarena S/N, Mazatlán, Sin. México 82040, Mexico. Electronic address: gael.lecroizier@hotmail.fr., Point D; UMR Géosciences Environnement Toulouse (GET), Observatoire Midi Pyrénées (OMP), 14 avenue Edouard Belin, 31400 Toulouse, France., Renedo M; UMR Géosciences Environnement Toulouse (GET), Observatoire Midi Pyrénées (OMP), 14 avenue Edouard Belin, 31400 Toulouse, France., Munaron JM; Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France., Espinoza P; Laboratorio de Ecología Trófica, Instituto del Mar del Perú, Esquina Gamarra y General Valle S/N Chucuito Callao, Lima, Peru; Carrera de Biología Marina, Facultad de Ciencias Veterinarias y Biológicas, Universidad Científica del Sur, Lima, Peru., Amezcua-Martinez F; Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Joel Montes Camarena S/N, Mazatlán, Sin. México 82040, Mexico., Lanco Bertrand S; Institut de Recherche pour le Développement (IRD), MARBEC (Univ. Montpellier, Ifremer, CNRS, IRD), Avenue Jean Monnet, 34200 Sète, France., Lorrain A; Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzané, France.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2022 Apr; Vol. 177, pp. 113481. Date of Electronic Publication: 2022 Mar 01.
DOI: 10.1016/j.marpolbul.2022.113481
Abstrakt: Assessing mercury (Hg) biomagnification requires the description of prey-predator relationships, for each species and ecosystem, usually based on carbon and nitrogen isotope analyses. Here, we analyzed two seabirds from the Humboldt Current ecosystem, the Guanay cormorant (Phalacrocorax bougainvillii) and the Peruvian booby (Sula variegata), as well as their main prey, the Peruvian anchovy (Engraulis ringens). We reported Hg concentrations, Hg biomagnification (BMF) and isotopic discrimination factors (Δ 13 C and Δ 15 N) in seabird whole blood. BMFs and Δ 13 C in our study (on wild birds where diet was not controlled) were similar to other piscivorous seabirds previously studied in captive settings, but Δ 15 N were lower than most captive experiments. We observed lower Hg concentrations in Humboldt seabirds compared to other oligotrophic ecosystems, possibly due to Hg biodilution in the high biomass of the first trophic levels. This work calls for a better characterization of Hg trophic dynamics in productive upwelling ecosystems.
(Copyright © 2022 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: