Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Inter-annual climate variability and zooplankton: applying teleconnection indices to two deep subalpine lakes in Italy |
| Abstract | Investigating relation between meteo-climatic indices and between-year variation in Daphnia population density and phenology is crucial for e. g. predicting impact of climate change on lake ecosystem structure and functioning. We tested whether and how two teleconnection indices calculated for the winter period, namely the East Atlantic pattern (EA(DJF)) and the Eastern Mediterranean Pattern (EMPDJF) were correlated with Daphnia population growth in two Italian subalpine lakes, Garda and Maggiore. We investigated between-lake temporal coherence in: i) water temperature within the water layer in which Daphnia is distributed; ii) timing of Daphnia initial and spring maximum population density peak and iii) the level of Daphnia spring maximum population density peak over an eleven-year period (1998-2008) of unchanged predation pressure by fish and invertebrates, and of common oligotrophy. Between-lake temporal coherence was high for an earlier start, and earlier, and lower, Daphnia population spring density peak after milder winters. Peak density level was coherently, positively correlated with soluble reactive phosphorus (SRP) concentration. We hypothesized that Daphnia peak densities were related to atmospheric modes of variability in winter and to the degree of late winter mixing promoting replenishment of algal nutrients into upper water layers and phytoplankton growth, enhancing food availability and Daphnia fecundity, promoting and Daphnia peak. |
| Source | Journal of limnology (Testo stamp.) 74 (1), pp. 123–132 |
| Keywords | Climate changepopulation phenologyDaphnia fecunditySRPphytoplankton |
| Journal | Journal of limnology (Testo stamp.) |
| Editor | Istituto per lo Studio degli Ecosistemi., Verbania Pallanza, Italia |
| Year | 2015 |
| Type | Articolo in rivista |
| DOI | 10.4081/jlimnol.2014.1014 |
| Authors | Manca, Marina; Rogora, Michela; Salmaso, Nico |
| Text | 367154 2015 10.4081/jlimnol.2014.1014 ISI Web of Science WOS 000352405900012 Climate change population phenology Daphnia fecundity SRP phytoplankton Inter annual climate variability and zooplankton applying teleconnection indices to two deep subalpine lakes in Italy Manca, Marina; Rogora, Michela; Salmaso, Nico CNR Inst Ecosyst Study; Sustainable Agro ecosystems and Bioresources Department, IASMA Research and Innovation Centre, Istituto Agrario di S. Michele all Adige Fondazione E. Mach, Italy Investigating relation between meteo climatic indices and between year variation in Daphnia population density and phenology is crucial for e. g. predicting impact of climate change on lake ecosystem structure and functioning. We tested whether and how two teleconnection indices calculated for the winter period, namely the East Atlantic pattern EA DJF and the Eastern Mediterranean Pattern EMPDJF were correlated with Daphnia population growth in two Italian subalpine lakes, Garda and Maggiore. We investigated between lake temporal coherence in i water temperature within the water layer in which Daphnia is distributed; ii timing of Daphnia initial and spring maximum population density peak and iii the level of Daphnia spring maximum population density peak over an eleven year period 1998 2008 of unchanged predation pressure by fish and invertebrates, and of common oligotrophy. Between lake temporal coherence was high for an earlier start, and earlier, and lower, Daphnia population spring density peak after milder winters. Peak density level was coherently, positively correlated with soluble reactive phosphorus SRP concentration. We hypothesized that Daphnia peak densities were related to atmospheric modes of variability in winter and to the degree of late winter mixing promoting replenishment of algal nutrients into upper water layers and phytoplankton growth, enhancing food availability and Daphnia fecundity, promoting and Daphnia peak. 74 Published version Articolo 2015_J_Limnol_74_1_123_132.pdf Articolo in rivista Istituto per lo Studio degli Ecosistemi. 1129 5767 Journal of limnology Testo stamp. Journal of limnology Testo stamp. J. limnol. Testo stamp. Journal of limnology. Testo stamp. michela.rogora ROGORA MICHELA marinamarcella.manca MANCA MARINA MARCELLA |