Consulta: creatorFacets:"Lahaye, V"
Registros recuperados: 5
Data/hora: 02/06/2024 09:00:16

Trace element levels in foetus-mother pairs of short-beaked common dolphins (Delphinus delphis) stranded along the French coasts
Provedor de dados: 5
Autores: Lahaye, V; Bustamante, Paco; Dabin, W; Churlaud, C; Caurant, Florence.
Tissues of foetus-mother pairs of common dolphins (Delphinus delphis) stranded along the French coasts (Bay of Biscay and English Channel) were analysed for their Cd, Cu, Hg, Se and Zn contents. In the kidneys, foetal Cd levels were extremely low, and strong relationships between Cu and Zn suggested the involvement of metallothioneins since early foetal life. The results also indicated a limited maternal transfer of Hg during pregnancy since levels in the tissues of foetuses were below 1 mu g g(-1) w.wt. However, hepatic Hg levels in foetuses increased with body length, and were also proportionate to maternal hepatic, renal and muscular Hg levels. Lastly, affinities between Hg and Se in tissues would participate in Hg neutralisation in both mothers-through...
Tipo: Text
Palavras-chave: North eastern Atlantic; Pregnancy; Selenium; Mercury; Marine mammals.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3691.pdf

Biological and ecological factors related to trace element levels in harbour porpoises (Phocoena phocoena) from European waters
Provedor de dados: 5
Autores: Lahaye, V; Bustamante, Paco; Law, J.r; Learmonth, J.a; Santos, M.b.; Boon, J.p.; Rogan, E; Dabin, W; Addink, M.j.; Lopez, A; Zuur, A.f.; Pierce, G.j.; Caurant, Florence.
Selected trace elements (Cd, Cu, Hg, Se, Zn) were measured in the kidneys and the liver of 104 harbour porpoises (Phocoena phocoena) stranded along the coasts of France, Galicia (Spain), Ireland, Scotland (UK), and the Netherlands. Generally, relatively low concentrations of toxic elements were encountered in the tissues of European porpoises, except for two individuals, which displayed high hepatic Hg concentrations. Also, elevated Cd levels obtained in Scottish porpoises could be related to their feeding preferences and this result suggests an increase of the proportion of cephalopods in their diet with latitude. Moreover, significant geographical differences were seen in hepatic Zn concentrations; the elevated Zn concentrations displayed by porpoises...
Tipo: Text
Palavras-chave: Tracers; Multivariate analysis; Diet; Age; Marine mammals; Zinc; Cadmium; Mercury; Heavy metals.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2920.pdf

Total and organic Hg concentrations in cephalopods from the North Eastern Atlantic waters: Influence of geographical origin and feeding ecology
Provedor de dados: 5
Autores: Bustamante, Paco; Lahaye, V; Durnez, C; Churlaud, C; Caurant, Florence.
Total (T-Hg) and organic (O-Hg) mercury concentrations and tissue distribution were examined in 20 species of cephalopods (n = 278) from the north eastern Atlantic waters, i.e. from the Bay of Biscay to the Faroe Islands. Concentrations of T-Hg in whole cephalopods showed elevated variations among species, i.e. from 40 to 3560ng g(-1) dwt, but a low variability within each species (mean CV%=39%). With the exception of oceanic squids, the digestive gland globally displayed higher T-Hg concentrations than the remaining tissues. In contrast, O-Hg concentrations determined in selected species were generally higher in the remaining tissues. Despite higher T-Hg concentrations, the digestive gland weakly contributed to the total body burden of both T-Hg and O-Hg...
Tipo: Text
Palavras-chave: Cuttlefish; Octopus; Squid; Body distribution; Speciation; Bioaccumulation.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1873.pdf

Lead contamination of small cetaceans in European waters - The use of stable isotopes for identifying the sources of lead exposure
Provedor de dados: 5
Autores: Caurant, Florence; Aubail, A; Lahaye, V; Van Canneyt, O; Rogan, E; Lopez, A; Addink, M; Churlaud, C; Robert, M; Bustamante, Paco.
Lead concentrations and isotopic composition have been measured in bone and teeth of small cetaceans belonging to three species (Delphinus delphis, Phocoena phocoena and Stenella coeruleoalba), to evaluate the toxicological risk and to determine sources of lead in the European waters. Lead concentrations, far lower than threshold value inducing toxic effects in human, were higher in teeth than in bones, but highly correlated between the two tissues (r = 0.92, p &lt; 0.001). Large variations of Pb-206/Pb-207 values in bone tissue showed that cetaceans must be submitted to various atmospheric influences. No geographical differences appeared which is consistent with studies on their distribution indicating seasonal movements between Brittany waters and the...
Tipo: Text
Palavras-chave: Lead; Hard tissues; Heavy metals; Harbour porpoises; Striped dolphins; Common dolphins; Northeast Atlantic; Temporal trends; Biomonitoring.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1813.pdf

Bioaccumulation of persistent organic pollutants in female common dolphins (Delphinus delphis) and harbour porpoises (Phocoena phocoena) from western European seas: Geographical trends, causal factors and effects on reproduction and mortality
Provedor de dados: 5
Autores: Pierce, G; Santos, M; Murphy, S; Learmonth, J; Zuur, A; Rogan, E; Bustamante, Paco; Caurant, Florence; Lahaye, V; Ridoux, Vincent; Zegers, B; Mets, A; Addink, M; Smeenk, C; Jauniaux, T; Law, R; Dabin, W; Lopez, A; Farre, J; Gonzalez, A; Guerra, A; Garcia Hartmann, M; Reid, R; Moffat, C; Lockyer, C; Boon, J.
Concentrations of polychlorinated biphenyls (PCBs) in blubber of female common dolphins and harbour porpoises from the Atlantic coast of Europe were frequently above the threshold at which effects on reproduction could be expected, in 40% and 47% of cases respectively. This rose to 74% for porpoises from the Southern North Sea. PCB concentrations were also high in southern North Sea fish. The average pregnancy rate recorded in porpoises (42%) in the study area was lower than in the western Atlantic but that in common dolphins (25%) was similar to that of the western Atlantic population. Porpoises that died from disease or parasitic infection had higher concentrations of persistent organic pollutants (POPs) than animals dying from other causes. Few of the...
Tipo: Text
Palavras-chave: Diet; Reproduction; Persistent organic pollutants; Delphinus delphis; Phocoena phocoena.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-7314.pdf