References of "Jauniaux, Thierry"
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See detailLes paramyxovirus des mammifères marins
Jauniaux, Thierry ULg

in proceeding of the conference (2004)

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See detailNorth Sea seabirds and marine mammals: pathology and ecotoxicology
Debacker, Virginie ULg; Coignoul, Freddy ULg; Das, Krishna ULg et al

Report (2004)

Les Bancs de Flandres accueillent, en hiver, une importante population d'oiseaux pélagiques. Dans le passé, ils étaient également largement fréquentés par les mammifères marins. De nos jours, on ne les ... [more ▼]

Les Bancs de Flandres accueillent, en hiver, une importante population d'oiseaux pélagiques. Dans le passé, ils étaient également largement fréquentés par les mammifères marins. De nos jours, on ne les observe que très rarement et, chaque année, quelques-uns d'entre eux et des centaines d'oiseaux sont trouvés échoués le long de la côte flamande. Ces espèces doivent être protégées, et le but de ce projet de recherche est d'étudier l'état de santé de leurs populations, son évolution temporelle, les pathologies observées et les contaminants associés, ainsi que les causes possibles de mortalités inhabituelles. La nuisance d'origine humaine la plus importante pour les oiseaux marins semble être la pollution par les hydrocarbures, mais les causes effectives des échouages des oiseaux qui ne sont pas mazoutés, et de la rareté des mammifères, restent inconnues (autres pollutions chimiques, diminution de la nourriture disponible, maladies... ?). [less ▲]

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See detailCytokine messenger RNA expression in the blood of harbour porpoises (phocoena phocoena).
Das, Krishna ULg; Fonfara, Sonja; Beineke, Andreas et al

Poster (2004)

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See detailTrace metal variations in tissues of harbour seals (Phoca vitulina) stranded along Southern North Sea coasts
Drouguet, Olivier; Jauniaux, Thierry ULg; Holsbeek, Ludo et al

Poster (2004)

During the last decade, recurrent epizootics have affected harbour seal (Phoca vitulina) populations in the North Sea. The trace metal levels of the harbour seal in the Southern North Sea are poorly known ... [more ▼]

During the last decade, recurrent epizootics have affected harbour seal (Phoca vitulina) populations in the North Sea. The trace metal levels of the harbour seal in the Southern North Sea are poorly known. In this study, trace metal concentrations (Zn, Cu, Fe, Cd, Hg and Se) were measured in tissues (liver, kidney and muscle) of 72 harbour seals collected along the coasts of France, Belgium and Netherlands between 1994 and 2004. Hg levels were significantly higher in seals from the Southern North Sea than in seals from Norwegian waters (1) probably due to the amount of anthropogenic inputs in the North Sea. Hepatic Hg was positively correlated to hepatic Se, both increasing with the length of the seals. Such a relationship reflects an age accumulation process coupled to a detoxication mechanism involving antagonism between Hg and Se in the liver. Increasing Zn and Hg hepatic levels were observed with degrading body condition of the harbour seals, which is reflected by decreasing blubber thickness and high hepatic to total body mass ratio. Body condition was particularly poor in seals which died from infectious diseases. These observations tend to indicate a global redistribution of trace metals from muscle and blubber to liver, as a result of protein and lipid catabolism linked to disease and starvation. [less ▲]

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See detailPathologie, leeftijd en geslacht van de olievogels
Jauniaux, Thierry ULg; Masure, S.

(2004)

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See detailPerfluorinated chemicals infiltrate ocean waters: Link between exposure levels and stable isotope ratios in marine mammals
Van de Vijver, Kristin Inneke; Hoff, Philippe Tony; Das, Krishna ULg et al

in Environmental Science & Technology (2003), 37(24), 5545-5550

This is the first study to report on concentrations of perfluorinated organochemicals (FOCs) in marine mammals stranded along the southern North Sea coast in relation to stable nitrogen and carbon isotope ... [more ▼]

This is the first study to report on concentrations of perfluorinated organochemicals (FOCs) in marine mammals stranded along the southern North Sea coast in relation to stable nitrogen and carbon isotope ratios (delta(15)N and delta(13)C). The presence of FOCs in top predators such as marine mammals would indicate a potential biomagnification of these compounds and their widespread occurrence. Liver and kidney tissues of nine marine mammal species have been sampled. Among all the measured FOCs compounds, PFOS (perfluorooctane sulfonate) was predominant in terms of concentration. The highest PFOS concentrations were found in the liver of harbor seal compared to white-beaked dolphin, harbor porpoise, gray seal, sperm whale, white-sided dolphin, striped dolphin, fin whale, and hooded seal. PFOS concentrations differed significantly between sexes and age classes in harbor porpoises. Stable isotope measurements (delta(13)C and delta(15)N) were used in this study to describe the behavior of contaminants in food webs. We found a significant (p < 0.05) linear relationship between PFOS concentrations in livers of harbor porpoises and both Muscle delta(13)C and delta(15)N measurements. Harbor and gray seals and white-beaked dolphin, which displayed the highest trophic position, contained the highest PFOS levels, while offshore feeders such as sperm whales,fin whales, striped dolphin, and white-sided dolphin showed lower PFOS concentrations than inshore species. [less ▲]

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See detailIdentification of specific biomarkers related to the effects of pollutants on the immune system of marine mammals
Brenez, Cécile; Gerkens, Pascal; Jauniaux, Thierry ULg et al

Poster (2003, December)

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See detailThe Tricolor incident: Pathology, age composition and sex ratio of stranded birds
Jauniaux, Thierry ULg; Masure, S.

in meeting report (2003)

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See detailDioxins, furans and dioxin-like PCBs in juvenile harbour porpoises (Phocoena Phocoena) from the North sea
Beans, Cristina; Debacker, Virginie ULg; Jauniaux, Thierry ULg et al

in Organohalogen Compounds (2003)

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See detailDioxins, furans and co-planar PCBs in juvenile harbour porpoises (Phocoena phocoena) from the Belgian coasts
Beans, Cristina ULg; Das, Krishna ULg; Jauniaux, Thierry ULg et al

Poster (2003)

Dioxins, furans and PCBs are lipophilic anthropogenic contaminants that have found their way into marine food webs and accumulate in top predators such as marine mammals, adding a stress factor to an ... [more ▼]

Dioxins, furans and PCBs are lipophilic anthropogenic contaminants that have found their way into marine food webs and accumulate in top predators such as marine mammals, adding a stress factor to an already vulnerable population. In this study 7 congeners of dioxins (PCDDs), 10 congeners of furans (PCDFs) and 4 congeners of coplanar PCBs (cPCBs) were determined using high resolution gas chromatography and mass spectrometry in the blubber of 19 juvenile harbour porpoises (Phocoena phocoena) stranded along the Belgian North Sea coastline between 1995 and 2001. These results were contrasted with nutritional status (emaciated or not), sex and trophic level (through stable carbon and nitrogen isotope analysis). Mean blubber concentrations of SPCDD/Fs were 12.8 pg/g lw (lipid weight) and mean related toxicity 1.84 pg TEQs/g lw (TEQs = TCDD toxic equivalents). Mean cPCB concentrations were 223,5 pg/g lw and mean related toxicity 4,47 pg TEQs/g lw. The levels detected in these individuals were of the same order as those found in a previous study in the Wadden Sea (Bruhn, 1999). Both sexes show rather similar levels. No significant relationship was observed between stable carbon or nitrogen isotope values and pollutant levels. Concentrations and toxicity show a tendency to be higher in emaciated ndividuals than in nonemaciated ones. This could indicate a possible relationship between the nutritional status of the animals and dioxinlike pollutants (which could participate in weakening the animal). This situation should be further studied on adult individuals in order to obtain a more global view of the possible effects on the population. [less ▲]

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See detailTrace metals in the harbour porpoise from the North Sea and adjacent areas: relationship with stable isotope measurements, the nutritional status, lesions of the respiratory system and parasitism.
Das, Krishna ULg; Siebert, Ursula; Fontaine, Michaël et al

Conference (2003)

Growing concern has been raised about the status and the long-term viability of the harbour porpoise (Phocoena phocoena) in the North Sea and adjacent areas. Sources of trace metal variations were ... [more ▼]

Growing concern has been raised about the status and the long-term viability of the harbour porpoise (Phocoena phocoena) in the North Sea and adjacent areas. Sources of trace metal variations were investigated using a multidisciplinary approach. Porpoises from the Belgian coasts were compared to individuals from the German North Sea and Baltic coasts, Denmark, Norway and Iceland. Toxicological results (Hg, Zn, Cu, Cd and Se) were confronted to most common pathological findings, namely emaciation, lesions of the respiratory system or parasitism. Influence of diet through stable carbon and nitrogen analysis (d13C and d15N), age and sex have also been considered. As expected, the nutritional status of stranded harbour porpoise from the Southern North Sea is poor compared to by-caught individuals from Norway and Iceland, as reflected by their blubber thickness, weight to length ratio and hepatic to total body mass ratio. The porpoises collected along the Southern North Sea coast display higher Zn and Hg concentrations compared to individuals collected in more preserved areas from the North Atlantic. Moreover, significant Zn, Hg and Se levels were observed with increasing emaciation severity. Porpoises displaying severe bronchopneumonia also have higher Zn concentrations probably due to the association previously described of emaciation and bronchopneumonia. Hg is clearly linked to parasitism. These increasing concentrations are not related to a shrinking of liver mass as it remains unchanged during the emaciation. As a result, hepatic trace metal load increases also. These observations tend to indicate a general redistribution of heavy metals within the organs (muscles to livers), which results from protein catabolism. Such a re-distribution could well be an additional stress for porpoises already experiencing stressful conditions (organochlorines, etc…). In contrast, Cu and Cd were never associated to emaciation. Other parameters such as age class or diet are more likely to be involved. [less ▲]

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See detailErysipelothrix rhusiopathiae infection in stranded harbour porpoise (Phocoena phocoena) and harbour seal (Phoca vitulina)
Boseret, Géraldine ULg; Jauniaux, Thierry ULg; Mainil, Jacques ULg

in anton, erken (Ed.) Proceedings of the 4th scientific meeting of the European Association of Zoo and Wildlife Veterinarians and 5th meeting of the European Wildlife Disease Assocation : Heidelberg, Germany 2002 / editor Anton ERKEN. (2002, May 08)

An adult female harbour porpoise (Phocoena phocoena ) and a juvenile male harbour seal have been found dead on a Belgian beach in autumn 2001. The two bodies were in good condition (CC = 2). Pure and ... [more ▼]

An adult female harbour porpoise (Phocoena phocoena ) and a juvenile male harbour seal have been found dead on a Belgian beach in autumn 2001. The two bodies were in good condition (CC = 2). Pure and abundant growth of a small rod-shaped, Gram-labile bacterium was obtained aerobically and anaerobically on Columbia bloodagar from the heart blood, the mouth, the pharynx, the lungs, the intestine and the anus of the porpoise, and from the intestine, the pharynx, the mouth, the nose and the anus of the seal. The colonies were surrounded by a narrow zone of a-hemolysis. The catalase- and peroxydase-tests gave negative results. Rapid ID 32 Strepto (Biomérieux, France) sugar tests applied on porpoise’s heart blood, lungs and intestine, and on seal’s intestine and pharynx identified this isolate to Erysipelothrix rhusiopathiae. Erysipelothrix rhusiopathiae is not reported as a common cause of infection and death in wild cetaceans and wild pinnipeds in opposite to respectively captive dolphins and sea lions. Nevertheless, E. rhusiopathiae can be considered as the cause of death of the stranded harbour porpoise as it was present in heart blood and internal organs, and the seal was carrying the bacterium with lesions of enteritis which could be associated with E. rhusiopathiae infectio [less ▲]

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See detailEchouage de mammifères marins : guide d'intervention et procédures d'autopsie
Jauniaux, Thierry ULg; Garcia-Hartmann, M.; Haelters, J. et al

in Annales de Médecine Vétérinaire (2002), 146(5, OCT-NOV), 261-276

Detailed reference viewed: 42 (8 ULg)