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Sediment trace metal levels in the Ojo de Liebre Lagoonal Complex (Baja California, Mexico), a marine wildlife protected area
2021
Valdivieso-Ojeda, Jacob Alberto | Huerta-Diaz, Miguel Angel | Delgadillo-Hinojosa, Francisco | Otero, Xosé Luis | Arenas-Islas, Diana | García-Orozco, Jonathan
Surficial sediment quality in the Ojo de Liebre Lagoon (OLL), Mexico, was evaluated via five geochemical indices. Results indicate that concentrations of the elements Ag, As, Cu, Fe, Mn, Mo, Ni, Sb, U, V and Zn do not exert adverse biological effects in this ecosystem. However, minor enrichment was observed for Ba (mean ± SD: 1.09 ± 0.17) and Co (1.57 ± 0.22) and was moderately severe for Cd (9.3 ± 2.0), possibly due to natural processes. The adverse effect index was >1 only for Hg, suggesting that concentrations of this element are sufficiently high (0.40 to 1.13 nmol g⁻¹) to potentially elicit adverse effects on local organisms in contact with sediments. This result is particularly important for grey whales (Eschrichtius robustus), given that they ingest large quantities of benthic organisms during their seasonal stay in the OLL.
Afficher plus [+] Moins [-]Organochlorine pesticide accumulation in seabirds and marine mammals from the Northwest Pacific
2018
Tsygankov, Vasiliy Yu | Lukyanova, Olga N. | Boyarova, Margarita D.
Bioaccumulation of organochlorine pesticides by marine organisms is one of the methods of environmental quality. Concentrations of organochlorine pesticides (HCH isomers (α-, β-, γ-HCH), p,p′-DDT and its metabolites (p,p′-DDD, p,p′-DDE)) in samples of seabirds (Northern fulmar Fulmarus glacialis, Crested auklet Aethia cristatella, Auklet-crumb Aethia pusilla, Pacific gull Larus schistisagus, and Gray petrel Oceanodroma furcate) and marine mammals (Gray whales Eschrichtius robustus and Pacific walrus Odobenus rosmarus divergens) were measured by a GC–MS. The total concentration of OCPs in mammals was higher than in seabirds. Environmental biomonitoring with the use of seabirds and marine mammals, as a long-lived species, is used for global monitoring, since bioaccumulation in these organisms occurs throughout life. The environmental assessment of the Northwest Pacific marine ecosystems revealed that the levels of OCP contamination in this area are similar to the other subarctic regions of the World Ocean.
Afficher plus [+] Moins [-]Levels of organochlorine compounds, including PCDDS and PCDFS, in the blubber of cetaceans from the west coast of North America
1996
Jarman, W.M. | Norstrom, R.J. | Muir, D.C.G. | Rosenberg, B. | Simon, M. | Baird, R.W. (Institute of Marine Sciences, University of California, Santa Cruz, CA 95064 (USA))
