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1.
V. Debacker A. Rutten T. Jauniaux C. Daemers J-M. Bouquegneau 《Biological trace element research》2001,82(1-3):87-107
Combined effects of heavy-metal contamination (Cu, Zn, and CH3Hg) and starvation were tested on common quails (Coturnix coturnix japonica) and used as a model for comparison with a wild common guillemot (Uria aalge) population found stranded at the Belgian coast. Appropriate heavy-metal levels were given to the quails to obtain concentrations
similar to those found in the seabirds’s tissues. The contaminated animals were then starved for 4 d to simulate the evident
malnutrition symptoms observed at the guillemot’s level. In such conditions, food intake and total-body weight are shown to
decrease in contaminated individuals with simultaneous significant hepatic and renal increase of the heavy-metal concentrations.
Like guillemots, higher heavy-metal levels were observed in those contaminated quails that had also developed a cachectic
status characterized by a general atrophy of their pectoral muscle and complete absence of subcutaneous and/or abdominal fat
depots. Although likely the result of a general protein catabolism during starvation, it is suggested that these higher metal
levels could as well enhance a general muscle wasting process (cachectic status). 相似文献
2.
Storage of Hg in the ileum of Blatella germanica: biochemical characterization of metallothionein 总被引:1,自引:0,他引:1
J M Bouquegneau C Ballan-Dufrancais A Y Jeantet 《Comp. Biochem. Physiol. C, Comp. Pharmacol. Toxicol.》1985,80(1):95-98
Cockroach ileum has a high capability to concentrate mercury compared with other tissues. Part of the mercury contained in the soluble phase of this organ is bound to metallothionein. It is suggested that mercury of the insoluble phase is stored in lysosomes under a polymerized metallothionein form. 相似文献
3.
Micha?l C. Fontaine Krystal A. Tolley Johan R. Michaux Alexei Birkun Jr Marisa Ferreira Thierry Jauniaux ángela Llavona Bayram ?ztürk Ayaka A ?ztürk Vincent Ridoux Emer Rogan Marina Sequeira Jean-Marie Bouquegneau Stuart J. E. Baird 《Proceedings. Biological sciences / The Royal Society》2010,277(1695):2829-2837
Recent climate change has triggered profound reorganization in northeast Atlantic ecosystems, with substantial impact on the distribution of marine assemblages from plankton to fishes. However, assessing the repercussions on apex marine predators remains a challenging issue, especially for pelagic species. In this study, we use Bayesian coalescent modelling of microsatellite variation to track the population demographic history of one of the smallest temperate cetaceans, the harbour porpoise (Phocoena phocoena) in European waters. Combining genetic inferences with palaeo-oceanographic and historical records provides strong evidence that populations of harbour porpoises have responded markedly to the recent climate-driven reorganization in the eastern North Atlantic food web. This response includes the isolation of porpoises in Iberian waters from those further north only approximately 300 years ago with a predominant northward migration, contemporaneous with the warming trend underway since the ‘Little Ice Age’ period and with the ongoing retreat of cold-water fishes from the Bay of Biscay. The extinction or exodus of harbour porpoises from the Mediterranean Sea (leaving an isolated relict population in the Black Sea) has lacked a coherent explanation. The present results suggest that the fragmentation of harbour distribution range in the Mediterranean Sea was triggered during the warm ‘Mid-Holocene Optimum’ period (approx. 5000 years ago), by the end of the post-glacial nutrient-rich ‘Sapropel’ conditions that prevailed before that time. 相似文献
4.
E. Ponzano F. Dondero J.-M. Bouquegneau R. Sack P. Hunziker A. Viarengo 《Polar Biology》2001,24(3):147-153
A cadmium-binding protein was purified from the digestive gland of the Antarctic scallop, Adamussium colbecki, and biochemically characterized. Purification procedures included gel permeation and anion exchange chromatography, followed by preparative polyacrylamide gel electrophoresis. Our results demonstrate that the A. colbecki cadmium-binding protein has the general properties of metallothioneins: low molecular weight of about 10 kDa, spectroscopic features typical of cadmium thiolate clusters and high metal (cadmium) content. Analysis of amino acid composition reveals the absence of aromatic amino acids, histidine, methionine and arginine. Asparagine and glutamine are also absent. The A. colbecki metallothionein shows high levels of glycine (14%), aspartic acid (14%), glutamic acid (11%) and a low lysine content (4%); the A. colbecki metallothionein shows a lower cysteine content (12%) compared to other metallothioneins (17–30%) purified from both vertebrate and invertebrate organisms. The presence of a metallothionein in the digestive gland of A. colbecki suggests that in cold-ocean-adapted molluscs the heavy metal homeostasis mechanisms may have evolved similarly to those of organisms living in temperate marine environments, although the A. colbecki cadmium-binding protein shows a typical amino acidic composition that might reflect a peculiar physiological role. Accepted: 7 August 2000 相似文献
5.
In the Meuse River (Liège area, Belgium), large amounts of three species of Bryozoans, Fredericella sultana (BLUM.), Plumatella emarginata ALL. and Plumatella fungosa (PALL.) occur. They cover 3 to 40% of the bank walls and their biomass ranges from 12 to 293 g m–2 (dry weight). In the heated waters of a nuclear power plant (Tihange) and of industries lined up along the river, colony development occurs 3 to 4 weeks earlier than at an upstream station. The heavy metal content of living colonies ranges from 4 to 21 mg kg–1 Cd, 45 to 182 mg kg–1 Cu, 803 to 2232 mg kg–1 Zn, 150 to 483 mg kg–1 Pb and 21 to 138 mg kg–1 Cr (DW). The mean concentration of PCBs was 925 µg kg–1 (DW). Heavy metal and PCB concentrations in the sediments were close to those of colonies, suggesting that most of the pollutants found in the Bryozoans is in fact in the sediment trapped by the colonies. 相似文献
6.
Gobert Sylvie Defawe Olivier Lepoint Gilles Demoulin Vincent Bouquegneau Jean-Marie 《Hydrobiologia》2001,455(1-3):121-125
In Posidonia oceanica (L.) Delile, anthesis induces a decrease in the number of juvenile leaves resulting in a significant reduction in the number of leaves on the flowering shoots. All the leaves of the flowering shoots are narrower than the leaves of nonflowering shoots. A modification of the leaf growth also appears in flowering shoots: the oldest leaves are longer and the leaves induced during or after anthesis are shorter. At 10 m depth, in the Bay of Calvi, anthesis lasts roughly 3 months and the flowering is induced 7 months before anthesis. 相似文献
7.
A stable isotope approach to the eastern Weddell Sea trophic web: focus on benthic amphipods 总被引:1,自引:0,他引:1
Fabienne Nyssen Thomas Brey Gilles Lepoint Jean-Marie Bouquegneau Claude De Broyer Patrick Dauby 《Polar Biology》2002,25(4):280-287
Stable isotope (13C/12C and 15N/14N) analyses were performed on 90 species belonging to different benthic communities sampled in the eastern Weddell Sea. The study focused on eight amphipod species whose isotopic composition was compared to their previously described respective gut contents. Amphipod stable isotope ratios correspond fairly accurately to the trophic classification based on gut contents and attest to their wide spectrum of feeding types. Since the fundamental difference between the isotope and the gut content approaches to diet studies is the time scale each method addresses, this coincidence indicates that there would be no significant changes in feeding strategies over time. Three levels of the food web are covered by the eight species and, instead of belonging strictly to one trophic category, amphipods display a continuum of values from the suspension-feeder to scavengers. 相似文献
8.
Toxicity of cadmium and mercury depends on the age and sex of contaminated locust imagoes. Both metals produce fat body injury, consisting in a reduction of energy reserves. They also disturb the function of the female genital apparatus. It is suggested that Hg has a direct effect on the germinal and the somatic cells of the reproductive system, whereas Cd inhibits the differentiation of the fat body cells and therefore the synthesis of the yolk products. No metallothionein has been detected; but Cd induces the production of a Cd-binding glycoprotein with a binding of Cd in the stoichiometric ratio 1 glycoprotein/1 metal. Besides the glycoprotein, mineralized ommochrome granules are important storage sites for Cd. 相似文献
9.
10.
Sylvie Gobert Pierre Lejeune Gilles Lepoint Jean-Marie Bouquegneau 《Hydrobiologia》2005,533(1-3):253-259
The carbon, nitrogen and phosphorus contents in flowering and nonflowering shoots were compared after an important flowering event occurred in the Posidonia meadow of the Bay of Calvi. The flower formation caused a significant increase of C and a significant decrease of N concentrations in intermediate and adult leaves. Minimum daily requirements in mgshoot-1day-1 of 3.4 and 4.8 of C, 0.09 and 0.09 N, 0.01 and 0.02 of P respectively for nonflowering and flowering shoots were calculated. It shows that additional quantities of C and P are required for the inflorescence elaboration. The unchanged quantity of N required by the shoot for the inflorescence elaboration and the significant modification of N concentration in intermediate and adult leaves suggests that N is limited in the environment and that an efficient resorption of N occurs from leaves to ensure the inflorescence formation. 相似文献