خيارات البحث
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Trends in organochlorine and mercury levels in gannet eggs.
1990
Newton I. | Haas M.B. | Freestone P.
Organochlorine and heavy metal contamination in non-viable eggs and its relation to breeding success in a Spanish population of lesser kestrels (Falco naumanni).
1993
Negro J.J. | Donazar J.A. | Hiraldo F. | Hernandez L.M. | Fernandez M.A.
Levels of polychlorinated biphenyls, organochlorine pesticides, mercury, cadmium, copper, selenium, arsenic, and zinc in the harbour seal, Phoca vitulina, in Norwegian waters.
1990
Skaare J.U. | Markussen N.H. | Norheim G. | Haugen S. | Holt G.
Protocole d' etude de la retombee de polluants metalliques dans le milieu marin dans le cadre du programe ATMOS de la Commission de Paris.
1994
Le Bihan A. | Cabon J.Y. | Tymen G.
Historical changes of soil metal background values in select areas of China.
1991
Li J. | Wu Y.
Mercury antagonists: loss of phototactic response in the brine shrimp Artemia and its prevention by thiamine.
1986
Yaeger E. | Siegel B.Z. | Siegel S.M. | Lasconia M. | Correal T.
Impacts of land uses on mercury retention in long-time cultivated soils, Brazilian Amazon
2013
Comte I. | Lucotte M. | Davidson R. | Reis de Carvalho C. | de Assis Oliveira F. | Rousseau G.X.
Many studies have shown the relationship between fire clearing and mercury contamination of aquatic ecosystems in the Brazilian Amazon. This study aimed at quantifying mercury content in long-time cultivated soils and at assessing the potential of a fire-free alternative clearing technique on mercury retention for long-time cultivated soils compared to traditional slash-and-burn. This case study included five land uses: one crop plot and one pasture plot cleared using slash-and-burn, one crop plot and one pasture plot cleared using chop-and-mulch, and one 40-year-old forest as a control. Low mercury concentrations were recorded in the surface horizon (24.83 to 49.48 ng g?1, 0–5 cm depth). The long-time cultivation (repeated burnings) of these soils triggered large mercury losses in the surface horizon, highlighted by high enrichment factors from surface to deeper horizons. The predominant effect of repeated burnings before the experimental implementation did not let us to distinguish a positive effect of the chop-and-mulch clearing method on soil mercury retention for crops and pastures. Moreover, some processes related to the presence of the mulch may favor mercury retention (Hg volatilization decrease, cationic sites increase), while others may contribute to mercury losses (cationic competition and dislocation, mobilization by the dissolved organic matter). (Résumé d'auteur)
اظهر المزيد [+] اقل [-]Levels of polychlorinated biphenyls, organochlorine pesticides, mercury and lead in relation to shell thickness in marsh harrier (Circus aeruginosus) eggs from Charente-Maritime, France
1999
Pain, D.J. | Burneleau, G. | Bavoux, C. | Wyatt, C. (The Royal Society for the Protection of Birds, The Lodge, Sandy, Bedfordshire SG19 2DL (United Kingdom))
Decomposition of pine-litter organic matter and chemical properties of upper soil layers: transect studies
1997
Breymeyer, A. | Degorski, M. | Reed, D. (Institute of Geography and Spatial Organization PAS, Twarda 51/55, 00-818 Warsaw (Poland))
