Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Sedimentary pigments in 308 alpine lakes and their relation to environmental gradients |
| Abstract | We undertook a comprehensive comparison between the pigment composition of surface sediment samples and contemporary catchment and limnological data deriving from 308 mountain lakes in 11 mountain regions (Lake Districts) covering a wide latitudinal and longitudinal gradient across Europe. This paper examines whether photosynthetic algal and bacterial pigments stored in the lake sediment can be used to identify different lake typologies and population dynamics of primary producers. We focus on a multivariate numerical analysis relating the relative abundance of marker pigments of algae, cyanobacteria and phototrophic sulphur bacteria to a set of physical and chemical factors (both natural and anthropogenic) determining the environmental conditions in mountain lakes. Redundancy Analysis (RDA), including partial RDA, of carotenoid assemblages constrained by environmental variables suggests that the main differences between lake districts are caused by geographic position (e.g. longitude), catchment characteristics (e.g. % carbonate rocks) and chemical variables (e.g. Mg, NO3). Other variables such as temperature and phosphorus play a minor role, probably be - cau se of the short length of the gradient covered by these cold and mostly oligotrophic lakes. Pigment composition varies primarily in response to catchment geology and pollution (i.e. acidification from long range transport) gradients. Purple sulphur photosynthetic bacteria (okenone) and cyanobacteria (echinenone, canthaxanthin, scytonemin) are replaced by siliceous algae (fucoxanthin and diatoxanthin), cryptophytes (alloxanthin) and dinoflagellates (diadinoxanthin). With respect to site classification, the pigment ordination shows a clear distinction between the more pristine lakes (in the Pyrenees) and the more polluted sites (in the Tatra Mountains and Central Southern Alps) or those with water higher in solute content (the Julian Alps and Greenland). |
| Source | Advances in limnology (1995) 62, pp. 217–238 |
| Keywords | carotenoidscanonical analysisalpine lakesEMERGE |
| Journal | Advances in limnology (1995) |
| Editor | Schweizerbart, Stuttgart, Germania |
| Year | 2009 |
| Type | Articolo in rivista |
| Authors | Lami A. (1); Musazzi S. (1); Marchetto A. (1); Buchaca T (2); Kernan M. (3); Jeppesen E. (4); Guilizzoni P. (1) |
| Text | 71923 2009 PUMA http //puma.isti.cnr.it/linkres.php resource=cnr.ise/cnr.ise/2009 A0 046 carotenoids canonical analysis alpine lakes EMERGE Sedimentary pigments in 308 alpine lakes and their relation to environmental gradients Lami A. 1 ; Musazzi S. 1 ; Marchetto A. 1 ; Buchaca T 2 ; Kernan M. 3 ; Jeppesen E. 4 ; Guilizzoni P. 1 1 CNR Istituto per lo studio degli Ecosistemi, Verbania, Italy 2 CSIC Centre dEstudis AvanËts de Blanes Ceab , Blanes, Spain. 3 UCL, Environmental Change Research Centre, London, U.K. 4 Department of Freshwater Ecology, National Environmental Research Institute, Silkeborg, Denmark. We undertook a comprehensive comparison between the pigment composition of surface sediment samples and contemporary catchment and limnological data deriving from 308 mountain lakes in 11 mountain regions Lake Districts covering a wide latitudinal and longitudinal gradient across Europe. This paper examines whether photosynthetic algal and bacterial pigments stored in the lake sediment can be used to identify different lake typologies and population dynamics of primary producers. We focus on a multivariate numerical analysis relating the relative abundance of marker pigments of algae, cyanobacteria and phototrophic sulphur bacteria to a set of physical and chemical factors both natural and anthropogenic determining the environmental conditions in mountain lakes. Redundancy Analysis RDA , including partial RDA, of carotenoid assemblages constrained by environmental variables suggests that the main differences between lake districts are caused by geographic position e.g. longitude , catchment characteristics e.g. % carbonate rocks and chemical variables e.g. Mg, NO3 . Other variables such as temperature and phosphorus play a minor role, probably be cau se of the short length of the gradient covered by these cold and mostly oligotrophic lakes. Pigment composition varies primarily in response to catchment geology and pollution i.e. acidification from long range transport gradients. Purple sulphur photosynthetic bacteria okenone and cyanobacteria echinenone, canthaxanthin, scytonemin are replaced by siliceous algae fucoxanthin and diatoxanthin , cryptophytes alloxanthin and dinoflagellates diadinoxanthin . With respect to site classification, the pigment ordination shows a clear distinction between the more pristine lakes in the Pyrenees and the more polluted sites in the Tatra Mountains and Central Southern Alps or those with water higher in solute content the Julian Alps and Greenland . 62 Sedimentary pigments in 308 alpine lakes and their relation to environmental gradients Lami_2009_AdvLimno_EMERGE.pdf Articolo in rivista Schweizerbart 1612 166X Advances in limnology 1995 Advances in limnology 1995 Adv. limnol. 1995 Advances in limnology. 1995 Ergebnisse der Limnologie 1995 1995 Archiv fur Hydrobiologie. Special issues Ergebnisse der Limnologie 1995 simona.musazzi MUSAZZI SIMONA aldo.marchetto MARCHETTO ALDO piero.guilizzoni GUILIZZONI PIERO andrea.lami LAMI ANDREA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |