Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Comparison between the mercury contamination in populations of Unio pictorum mancus (Mollusca, Bivalvia) from two lakes of different trophic state: the oligo-mesotrophic Lake Maggiore and the eutrophic Lake Candia |
| Abstract | This research was designed to evaluate the influence of mussel (Unio pictorum mancus) size on mercury concentration in mussel soft tissues. It also evaluated the relationships between calcium, mercury and selenium in the mussel tissues. The mussel populations from the deep, meso-oligotrophic Lake Maggiore and the shallow, eutrophic Lake Candia were analyzed. The mean concentration of mercury in the tissues was 0.075 mg kg-1 in Lake Maggiore mussels and 0.033 mg kg-1 in Lake Candia mussels. The local mercury content in the mussel biomass per surface unit was about eleven-fold higher in Lake Maggiore (5.99 ¼g Hg m-2) than in Lake Candia (0.55 ¼g Hg m-2). This wide difference was due firstly to the larger population density (46.86 vs 6.93 ind m-2) and secondly to the higher individual content (0.128 vs 0.079 ¼g Hg ind-1) in Lake Maggiore than in Lake Candia. These differences in population density and individual mercury content are the result of both biological and environmental characteristics. Lake trophy and water renewal affect population density and individual growth rate, and ultimately determine their impact on biogeochemical cycles by regulating the mussel standing stock. The relationships between mercury, calcium and selenium were taken into account. |
| Source | Journal of limnology (Testo stamp.) 68 (2), pp. 359–367 |
| Keywords | freshwater musseltrophic degreestotal and organic mercurycalciumselenium |
| Journal | Journal of limnology (Testo stamp.) |
| Editor | Istituto per lo Studio degli Ecosistemi., Verbania Pallanza, Italia |
| Year | 2009 |
| Type | Articolo in rivista |
| DOI | 10.3274/JL09-68-2-18 |
| Authors | Ravera O.; Beone G.M.(1); Fontanella M.C.; Riccardi N.; Cattani I.(1) |
| Text | 53080 2009 10.3274/JL09 68 2 18 freshwater mussel trophic degrees total and organic mercury calcium selenium Comparison between the mercury contamination in populations of Unio pictorum mancus Mollusca, Bivalvia from two lakes of different trophic state the oligo mesotrophic Lake Maggiore and the eutrophic Lake Candia Ravera O.; Beone G.M. 1 ; Fontanella M.C.; Riccardi N.; Cattani I. 1 CNR Institute of Ecosystem Study, Largo Tonolli 50, I 28922 Verbania Pallanza, Italy 1 Universita Cattolica del Sacro Cuore, Istituto di Chimica Agraria e Ambientale, Via E. Parmense 84, 29100 Piacenza, Italy This research was designed to evaluate the influence of mussel Unio pictorum mancus size on mercury concentration in mussel soft tissues. It also evaluated the relationships between calcium, mercury and selenium in the mussel tissues. The mussel populations from the deep, meso oligotrophic Lake Maggiore and the shallow, eutrophic Lake Candia were analyzed. The mean concentration of mercury in the tissues was 0.075 mg kg 1 in Lake Maggiore mussels and 0.033 mg kg 1 in Lake Candia mussels. The local mercury content in the mussel biomass per surface unit was about eleven fold higher in Lake Maggiore 5.99 ¼g Hg m 2 than in Lake Candia 0.55 ¼g Hg m 2 . This wide difference was due firstly to the larger population density 46.86 vs 6.93 ind m 2 and secondly to the higher individual content 0.128 vs 0.079 ¼g Hg ind 1 in Lake Maggiore than in Lake Candia. These differences in population density and individual mercury content are the result of both biological and environmental characteristics. Lake trophy and water renewal affect population density and individual growth rate, and ultimately determine their impact on biogeochemical cycles by regulating the mussel standing stock. The relationships between mercury, calcium and selenium were taken into account. 68 Published version Articolo pubblicato Ravera_et_al_2009.pdf Articolo in rivista Istituto per lo Studio degli Ecosistemi. 1129 5767 Journal of limnology Testo stamp. Journal of limnology Testo stamp. J. limnol. Testo stamp. Journal of limnology. Testo stamp. nicolettarita.riccardi RICCARDI NICOLETTA RAVERA OSCAR TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |