| Abstract | Stable isotope analysis of carbon (C) and nitrogen (N) was used to study the nature and origin of the suspended particulate matter (SPM) in a small Mediterranean reservoir, Lake Sos Canales (SC). The δ13C and δ15N isotopic ratios, physical-chemical parameters, nutrients and phytoplankton were analyzed ca. monthly over a hydrological year on the vertical profile at two stations (lacustrine and riverine). SPM quantity and composition were related to the hydrological annual dynamic. In Mediterranean reservoirs, water-level fluctuation is one of the most important stressors, largely dependent on the strong seasonality of climate and water exploitation for human uses. Mediterranean reservoirs show different phases during a hydrological year, alternating empty and low water level (summer-autumn), re-filling (winter-spring) and high water (spring-summer) phases. Isotopic ratios of C and N were similar on the vertical profile and at the two stations during the low water phase, but differed during the re-filling and high water phases. Significant correlations were found between δ15N and water level, and between δ13C and temperature in the surface layer at the lacustrine station. An unusual δ13C distribution along the water column during the re-filling phase was interpreted on the basis of phytoplankton species composition, mainly due by Gymnodinium uberrimum. |
| Text | 386457 2016 10.1051/limn/2016029 Scopus 2 s2.0 85006371748 Dinoflagellate LTER Stable isotope analysis Suspended particulate matter Water level fluctuation Study on the suspended particulate matter of a Mediterranean artificial lake Sos Canales Lake using Stable Isotope Analysis of carbon and nitrogen Fadda A.; Manca M.; Camin F.; Ziller L.; Buscarino P.; Mariani M.; Padedda B.M.; Sechi N.; Virdis T.; Luglie A. Dipartimento di Scienze della Natura e Del Territorio, University of Sassari, via Piandanna 4, Sassari, , Italy; CNR Institute of Ecosystem Study CNR ISE , Largo Tonolli 50, Verbania, , Italy; IASMA, Fondazione Edmund Mach, San Michele all Adige, TN, , Italy; Ente Acque della Sardegna, via Mameli 88, Cagliari, , Italy Stable isotope analysis of carbon C and nitrogen N was used to study the nature and origin of the suspended particulate matter SPM in a small Mediterranean reservoir, Lake Sos Canales SC . The δ13C and δ15N isotopic ratios, physical chemical parameters, nutrients and phytoplankton were analyzed ca. monthly over a hydrological year on the vertical profile at two stations lacustrine and riverine . SPM quantity and composition were related to the hydrological annual dynamic. In Mediterranean reservoirs, water level fluctuation is one of the most important stressors, largely dependent on the strong seasonality of climate and water exploitation for human uses. Mediterranean reservoirs show different phases during a hydrological year, alternating empty and low water level summer autumn , re filling winter spring and high water spring summer phases. Isotopic ratios of C and N were similar on the vertical profile and at the two stations during the low water phase, but differed during the re filling and high water phases. Significant correlations were found between δ15N and water level, and between δ13C and temperature in the surface layer at the lacustrine station. An unusual δ13C distribution along the water column during the re filling phase was interpreted on the basis of phytoplankton species composition, mainly due by Gymnodinium uberrimum. 52 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 85006371748 partnerID=q2rCbXpz Articolo 2016_A0_079.pdf Articolo in rivista EDP sciences, 0003 4088 Annales de limnologie Annales de limnologie Ann. limnol. Annales de limnologie. International journal of limnology marinamarcella.manca MANCA MARINA MARCELLA |
