Publications des scientifiques de l'IRD

Le Croizier Gael, Point David, Renedo M., Munaron Jean-Marie, Espinoza P., Amezcua-Martinez F., Bertrand S. L., Lorrain Anne. (2022). Mercury concentrations, biomagnification and isotopic discrimination factors in two seabird species from the Humboldt Current ecosystem. Marine Pollution Bulletin, 177, 113481 [7 p.]. ISSN 0025-326X.

Titre du document
Mercury concentrations, biomagnification and isotopic discrimination factors in two seabird species from the Humboldt Current ecosystem
Année de publication
2022
Type de document
Article référencé dans le Web of Science WOS:000778939000006
Auteurs
Le Croizier Gael, Point David, Renedo M., Munaron Jean-Marie, Espinoza P., Amezcua-Martinez F., Bertrand S. L., Lorrain Anne
Source
Marine Pollution Bulletin, 2022, 177, 113481 [7 p.] ISSN 0025-326X
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 (delta C-13 and delta N-15) in seabird whole blood. BMFs and delta C-13 in our study (on wild birds where diet was not controlled) were similar to other piscivorous seabirds previously studied in captive settings, but delta N-15 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.
Plan de classement
Limnologie biologique / Océanographie biologique [034] ; Ecologie, systèmes aquatiques [036] ; Pollution [038]
Description Géographique
PACIFIQUE ; PEROU
Localisation
Fonds IRD [F B010084633]
Identifiant IRD
fdi:010084633
Contact