Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Spatiotemporal dynamics of C and N isotopic signature of zooplankton: a seasonal study on a man-made lake in the Mediterranean region |
| Abstract | Reservoirs are subject to severe fluctuations in the water level from seasonal and interannual climatic variations, as well as abstraction for irrigation, hydropower, and drinking water. This can affect the matter and energy transfer through the food web, of which zooplankton is of crucial importance. We traced seasonal changes in the carbon and nitrogen stable isotope signatures of suspended particulate matter and crustacean zooplankton from a small Mediterranean reservoir. The delta C-13 and delta N-15 isotopic baseline signature of the lake varied seasonally, becoming more C-13-depleted and N-15-enriched in winter and less C-13-depleted and N-15-enriched values in the drier summer months, when external water inputs were negligible. Seasonal changes in the delta C-13 and delta N-15 SPM isotopic signature were well reflected in the herbivorous cladocerans. delta N-15 of the calanoid and cyclopoid copepods were at least 3% greater than for the herbivorous cladocera, suggesting their potential use as a food resource. delta C-13 of predatory copepods were also consistent with seasonal fluctuations in the delta C-13 SPM baseline, except during the heavy rains in early spring, when they were observably rich in lipids with a higher C/N ratio, suggesting that they had entered dormancy and were not actively feeding in the water column. This indicates the importance of taking into account not only the seasonality, but the community dynamics and trophic level of zooplankton taxa when interpreting stable isotope studies. |
| Source | Annales de limnologie 50 (4), pp. 279–287 |
| Keywords | Reservoirwater-level fluctuationssuspended particulate matterzooplanktonstable isotope analysis |
| Journal | Annales de limnologie |
| Editor | EDP sciences,, Les Ulis, Francia |
| Year | 2014 |
| Type | Articolo in rivista |
| DOI | 10.1051/limn/2014022 |
| Authors | Amedeo Fadda; Ruth Rawcliffe; Bachisio Mario Padedda; Antonella Luglie; Nicola Sechi; Federica Camin; Luca Ziller; Marina Manca |
| Text | 328677 2014 10.1051/limn/2014022 ISI Web of Science WOS 000346605600003 Scopus 2 s2.0 84907888108 Reservoir water level fluctuations suspended particulate matter zooplankton stable isotope analysis Spatiotemporal dynamics of C and N isotopic signature of zooplankton a seasonal study on a man made lake in the Mediterranean region Amedeo Fadda; Ruth Rawcliffe; Bachisio Mario Padedda; Antonella Luglie; Nicola Sechi; Federica Camin; Luca Ziller; Marina Manca Univ Sassari Italy; Consiglio Nazionale delle Ricerche CNR ; Fondazione Edmund Mach Reservoirs are subject to severe fluctuations in the water level from seasonal and interannual climatic variations, as well as abstraction for irrigation, hydropower, and drinking water. This can affect the matter and energy transfer through the food web, of which zooplankton is of crucial importance. We traced seasonal changes in the carbon and nitrogen stable isotope signatures of suspended particulate matter and crustacean zooplankton from a small Mediterranean reservoir. The delta C 13 and delta N 15 isotopic baseline signature of the lake varied seasonally, becoming more C 13 depleted and N 15 enriched in winter and less C 13 depleted and N 15 enriched values in the drier summer months, when external water inputs were negligible. Seasonal changes in the delta C 13 and delta N 15 SPM isotopic signature were well reflected in the herbivorous cladocerans. delta N 15 of the calanoid and cyclopoid copepods were at least 3% greater than for the herbivorous cladocera, suggesting their potential use as a food resource. delta C 13 of predatory copepods were also consistent with seasonal fluctuations in the delta C 13 SPM baseline, except during the heavy rains in early spring, when they were observably rich in lipids with a higher C/N ratio, suggesting that they had entered dormancy and were not actively feeding in the water column. This indicates the importance of taking into account not only the seasonality, but the community dynamics and trophic level of zooplankton taxa when interpreting stable isotope studies. 50 Published version Articolo 2014_Ann_Limnol_50_279_287.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 TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |