| Title | The environmental history of a mountain lake (Lago Paione Superiore, central Alps, Italy) for the last c.100 years: A multidisciplinary, palaeolimnological study |
| Abstract | A palaeoecological study of an oligotrophic alpine lake, Paione Superiore (Italy), provided a record of historical changes in water quality. Historical trends in lake acidification were reconstructed by means of calibration and regression equations from diatoms, chrysophycean scales and pigment ratios. The historical pH was inferred by using two different diatom calibration data sets, one specific to the alpine region. These pH trends, together with the record of sedimentary carbonaceous particles and chironomid remains, indicate a recent acidification of this low alkalinity lake. |
| Source | Journal of paleolimnology 15 (3), pp. 245–264 |
| Keywords | palaeolimnologyacidificationdiatomschrysophytespigmentschironomidstemperatureAlpsItaly |
| Journal | Journal of paleolimnology |
| Editor | Kluwer Academic, Boston, Paesi Bassi |
| Year | 1996 |
| Type | Articolo in rivista |
| DOI | 10.1007/BF00213044 |
| Authors | Guilizzoni, P; Marchetto, A; Lami, A; Cameron, NG; Appleby, PG; Rose, NL; Schnell, OA; Belis, CA; Giorgis, A; Guzzi, L |
| Text | 407954 1996 10.1007/BF00213044 ISI Web of Science WOS A1996UV97200005 palaeolimnology acidification diatoms chrysophytes pigments chironomids temperature Alps Italy The environmental history of a mountain lake Lago Paione Superiore, central Alps, Italy for the last c.100 years A multidisciplinary, palaeolimnological study Guilizzoni, P; Marchetto, A; Lami, A; Cameron, NG; Appleby, PG; Rose, NL; Schnell, OA; Belis, CA; Giorgis, A; Guzzi, L UCL; UNIV LIVERPOOL; UNIV BERGEN; INST LIMNOL DR RA RINGUELET; ENEL SPA A palaeoecological study of an oligotrophic alpine lake, Paione Superiore Italy , provided a record of historical changes in water quality. Historical trends in lake acidification were reconstructed by means of calibration and regression equations from diatoms, chrysophycean scales and pigment ratios. The historical pH was inferred by using two different diatom calibration data sets, one specific to the alpine region. These pH trends, together with the record of sedimentary carbonaceous particles and chironomid remains, indicate a recent acidification of this low alkalinity lake. Concentration of total organic matter, organic carbon, nitrogen, biogenic silica BSiO2 , chlorophyll derivatives CD , fucoxanthin, diatom cell concentration and number of chironomid head capsules increased during the last 2 3 decades. When expressed as accumulation rates, most of these parameters tended to decrease from the past century to c. 1950, then all except P increased to the present day. A marked increase in sedimentary nitrogen may be related to atmospheric pollution and to the general increases in output of N in Europe. High C/N ratios indicate a prevailing allochthonous source of organic matter. Finally, the increase in measured air temperature from the mid 1800 s appeared to be related to lake water pH before industrialization cold periods generally led to lower pH and vice versa. The more recent phenomenon of anthropogenic acidification has apparently decoupled this climatic water chemistry relationship. 15 Published version Articolo in rivista Kluwer Academic 0921 2728 Journal of paleolimnology Journal of paleolimnology J. paleolimnol. piero.guilizzoni GUILIZZONI PIERO aldo.marchetto MARCHETTO ALDO andrea.lami LAMI ANDREA |
