Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Ecological effects of level fluctuations in Lake Maggiore (Northern Italy) |
| Abstract | In the oligotrophic Lake Maggiore, a deep subalpine lake in Northern Italy, blooms of Anabaena lemmermannii appeared in recent years despite in-lake TP concentration always being <10µg L-1. In the same years, the regular summer lake-level fluctuation was altered due to the interaction between climate change and human exploitation of water resource. Seeking a causal relation linking level fluctuations and cyanobacterial blooms, we investigated the appearance of pulse injections of organic matter from lake shore after drought. We simulated the arid and flood periods exposing artificial substrates for 30 days near the lake shore. The substrates were recovered and analysed for organic carbon and total phosphorous, the limiting nutrient for this lake. The C and P release upon rewetting was measured after 3 and 30 days. The C:P ratio of the leaked material resulted two orders of magnitude lower than in freshly recovered organic matter from artificial substrates. We hypothesised that rain washout of lake shore in a low lake-level state may supply P enrichment, promoting the germination of A.lemmermannii akinetes, thus starting the bloom. Lingua abstractEnglish |
| Source | ASLO, San Juan, Puerto Rico, 13-18 febbraio 2011 |
| Keywords | Lake MaggioreLevel fluctuationCyanobacteria |
| Year | 2011 |
| Type | Presentazione |
| Authors | Bertoni, Roberto; Callieri, Cristiana; Contesini, Mario; |
| Text | 205857 2011 Lake Maggiore Level fluctuation Cyanobacteria Ecological effects of level fluctuations in Lake Maggiore Northern Italy Bertoni, Roberto; Callieri, Cristiana; Contesini, Mario; CNR ISE, Pallanza Verbania In the oligotrophic Lake Maggiore, a deep subalpine lake in Northern Italy, blooms of Anabaena lemmermannii appeared in recent years despite in lake TP concentration always being <10µg L 1. In the same years, the regular summer lake level fluctuation was altered due to the interaction between climate change and human exploitation of water resource. Seeking a causal relation linking level fluctuations and cyanobacterial blooms, we investigated the appearance of pulse injections of organic matter from lake shore after drought. We simulated the arid and flood periods exposing artificial substrates for 30 days near the lake shore. The substrates were recovered and analysed for organic carbon and total phosphorous, the limiting nutrient for this lake. The C and P release upon rewetting was measured after 3 and 30 days. The C P ratio of the leaked material resulted two orders of magnitude lower than in freshly recovered organic matter from artificial substrates. We hypothesised that rain washout of lake shore in a low lake level state may supply P enrichment, promoting the germination of A.lemmermannii akinetes, thus starting the bloom. Lingua abstractEnglish ID_PUMA /cnr.ise/2011 A3 015. Area di valutazione04 Scienze della Terra ASLO San Juan, Puerto Rico 13 18 febbraio 2011 Internazionale Presentazione roberto.bertoni BERTONI ROBERTO mario.contesini CONTESINI MARIO cristiana.callieri CALLIERI CRISTIANA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |