|
|
|
| Registros recuperados: 27 | |
|
|
| Delbeke, K.; Joiris, C.R.; Bossicart, M.. |
| PCB levels in sediments (bulk and fraction <63µm), suspended matter and zooplankton from the Belgian continental shelf of the North Sea and the Scheldt estuary were educated in relation to their organic carbon content, their lipid content and, for sediments, their particle size distribution. PCB accumulation mechanisms are discussed, considering the importance of direct contamination (absorption onto the cell surfaces, absorption through the cell walls and partitioning into the cell lipids) for suspended matter and sediments, and of indirect contamination through the food for zooplankton. Geographical and seasonal variations are described. |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1990 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2820 |
| |
|
|
| Joiris, C.R.; Holsbeek, L.; Bossicart, M.; Tapia, G.. |
| Four sperm whales (three subadult males stranded on the Belgian coast, a fourth older male found dead at sea) were analysed for total mercury, methylmercury and organochlorines. All four were part of a total of 24 sperm whales that stranded on the North Sea coasts over a period of six months, a highly unusual phenomenon. Total mercury levels ranged from 0.5 µg/g fw in kidney and 1 in muscle, up to 15 in liver. The finding of at least 90% of the mercury in its inorganic form confirms the existence of detoxification mechanisms in the liver of cetaceans. PCB concentrations in muscle, liver, kidney and blubber ranged from 10 to 25 µg/g lipids. These results are in the same order of magnitude as literature data, which however does not imply that there is no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Detoxification Mercury Social behaviour Stranding ANE; Belgium ANE; North Sea; Southern Bight. |
| Ano: 1997 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=837 |
| |
|
|
| Sanga, R.N.; Bartell, S.M.; Ponce, R.A.; Boischo, A.A.P.; Joiris, C.R.; Pierce, C.H.; Faustman, S.M.. |
| This article presents a general model for estimating population heterogeneity and “lack of knowledge” uncertainty in methylmercury (MeHg) exposure assessments using two-dimensional Monte Carlo analysis. Using data from fish-consuming populations in Bangladesh, Brazil, Sweden, and the United Kingdom, predictive model estimates of dietary MeHg exposures were compared against those derived from biomarkers (i.e., [Hg]hair and [Hg]blood). By disaggregating parameter uncertainty into components (i.e., population heterogeneity, measurement error, recall error, and sampling error) estimates were obtained of the contribution of each component to the overall uncertainty. Steady-state diet:hair and diet:blood MeHg exposure ratios were estimated for each population... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 2001 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6917 |
| |
|
| |
|
|
| Joiris, C.R.. |
| The summer at-sea distribution of seabirds and marine mammals was quantitatively established both in Antarctica (Weddell Sea) and in the European Arctic: Greenland, Norwegian and Barents seas. Data can directly be compared, since the same transect counts were applied by the same team from the same icebreaking ship in both regions. The main conclusion is that densities of seabirds and marine mammals are similar in open water and at the ice edge from both polar regions, while the presence of Adélie penguins, minke whales and crabeater seals in densities more than one order of magnitude higher in Antarctic pack-ice must reflect a major ecological difference between both polar systems. The ecological implications of these observations are discussed, especially... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aves [Birds] Cetacea [whales; Dolphins and porpoises] Pinnipedia. |
| Ano: 2000 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6822 |
| |
|
|
| Holsbeek, L.; Joiris, C.R.; Debacker, V.; Ali, B.I.; Roose, P.; Nellissen, J.P.; Gobert, S.; Bouquegneau, J.-M.; Bossicart, M.. |
| Seven male sperm whales stranded on the southern North Sea coast during the 1994/95 winter were analysed for stable pollutant concentrations in muscle, liver, kidney and blubber: heavy metals (total and organic Hg, Se, Zn, Pb, Ni, Cd, Fe, Cr, Cu and Ti), organochlorines (PCBs and pesticides) and polycyclic aromatic hydrocarbons (PAHs), High concentrations of Cd (up to 300 mu g/g dw in kidney), Hg (up to 130 mu g/g dw in liver) and PCBs (up to 5 mu g/g dw in blubber) were detected, but not considered as the direct cause of mortality, while their possible indirect influence on the health status and/or behaviour of the North Atlantic sperm whale population is discussed. |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6837 |
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Joiris, C.R.; Holsbeek, L.; Laroussi, M.N.. |
| This paper reports concentrations of total mercury and methylmercury in muscle, liver and gonads of two sardines (Sardinella aurita, n=184 and Sardina pilchardus, n=87) from three coastal areas off Tunisia. Mercury concentration in muscle and liver showed significant positive correlation with fish length (i.e. with age). The relative methylmercury concentration was high and constant in muscle (>85% MeHg), and was decreasing with age in liver (from 50% to 20%), which might reflect the existence of a slow demethylation process. From the geographic point of view, Hg concentration was similar in the northern and eastern areas (0.32 µg g-1 dw in muscle for Sardinella aurita, 0.41 for Sardina pilchardus), but significantly lower in the southern zone (0.19 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sardina pilchardus; Sardinella aurita [round sardinella]. |
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6838 |
| |
|
| |
|
| |
|
| |
|
|
| Baeyens, W.F.J.; Leermakers, M.; Molina, R.; Holsbeek, L.; Joiris, C.R.. |
| Aqueous distillation is a common initial step in the determination of monomethyl mercury (MMHg) in a variety of matrices. However, recently it was observed that during distillation, MMHg may be generated from inorganic mercury and induce in some cases significant analytical errors. Therefore we investigated a number of alternative analytical techniques for the determination of MMHg in sediments and biological tissues: (1) headspace-GC-AFS and some variants; (2) acid extraction-solvent extraction-GC-AFS; (3) acid extraction-solvent extraction-GC-ECD. Methods (2) and (3) showed MMHg generation when an inorganic Hg spike was added to the sediment sample. The headspace method yielded MMHg results in agreement with the reference values for biological and... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6829 |
| |
|
|
| Joiris, C.R.; Azokwu, M.I.; Otchere, F.A.; Ali, I.B.. |
| Samples of the bivalve Anadara (Senilia) senilis collected from a closed lagoon (Sakumo) and two open lagoons in Ghana (Benya and Ningo; n=550), and the Bonny river estuary in Nigeria (n=620), were analyzed for their total and organic mercury content. Total mercury concentration showed significant spatial differences, with median values of 0.1 µg/g dry wt. in the closed lagoon, 0.2 in the estuary and 0.3 in the open lagoons. Concentration tended to be higher during the dry season in the lagoons, but lower in the estuary. The median relative organic concentration varied between 20 and 60% methyl Hg, depending on location and season. Age effects were detected in the lagoons, total Hg concentration decreasing with length. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bivalvia. |
| Ano: 1998 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6843 |
| |
|
|
| Joiris, C.R.; Bertels, A.. |
| Comparison of measured primary production, by radioactive carbonate incorporation or oxygen production, with diel variations of oxygen, inorganic carbon and particulate carbon, shows that the net in situ production often exceeds the measured activity, especially in deeper marine ecosystems. In vitro incubations under fluctuating light conditions provide higher values of primary production at low light intensities, both with cultures and with natural populations. The same results are obtained with in situ incubations, by varying the depth of incubation. This method allows reevaluation of primary productivity at low light intensities and provides results in agreement with the in situ variations of oxygen, inorganic carbon and particulate carbon. It can... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1985 |
URL: http://www.vliz.be/imisdocs/publications/303172.pdf |
| |
|
| |
|
|
| Holsbeek, L.; Siebert, U.; Joiris, C.R.. |
| Heavy metal concentrations (total and organic Hg, Ti, Cr, Cu, Zn, Cd and Pb) were determined in the muscle, liver and kidney of 36 dolphins stranded on the French Atlantic coast between 1977 and 1990: 29 common dolphins Delphinus delphis, five bottlenose dolphins Tursiops truncatus and two striped dolphins Stenella coeruleoalba. Total Hg concentration in the liver increased with age, while relative methylmercury concentration decreased, reflecting the existence of a slow demethylation process. To a lower extent, a similar pattern was observed in the kidney and muscle. No age-related increase was found for other heavy metals, although the highest levels for Cd and Cr were always found in adults. No difference in contamination could be detected between the... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1998 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6844 |
| |
| Registros recuperados: 27 | |
|
|
|
