Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Phytoplankton and zooplankton species distribution in the high altitude lakes of the Piora valley (Canton Ticino, Switzerland). |
| Abstract | Species composition of phyto- and zooplankton assemblages in four lakes of altitude between 1850 and 2377 meters in the Piora valley were studied in July 2010. All the lakes were dominated by diatoms and chlorophytes, both recorded with a similar number of taxa, except in Lake Tom, where a lower number of taxonomic units were found among the chlorophytes. The taxonomic composition of the phytoplankton assemblage was basically the same in all the lakes sampled. The zooplankton composition was evaluated both on the samples collected during the 2010 survey and on samples collected in previous years from lakes of the same area. Totally ten lakes were compared. The taxonomic composition varied not only among the lakes, but, as can be expected, also within each lake during the different years. In terms of zooplankton diversity, the highest species richness was found in Lake Cadagno. Rotifers were the most represented as a number of taxa in all the lakes sampled, except in Lake Pecian. The rate of change in species composition along the altitudinal gradient points to an altitudinal threshold partitioning the lakes into two groups characterized by relatively different zooplankton assemblages. However, whether is altitude the major structuring factor for zooplankton species composition in the Piora lakes, or (likely) local factors are more effectively acting in each site is a question that cannot be answered by this preliminary study. |
| Source | Memorie della Società ticinese di scienze naturali e del Museo cantonale di storia naturale 11, pp. 79–93 |
| Keywords | planktonalpine lakesalpine biodiversitysouthern Swiss Alps |
| Journal | Memorie della Società ticinese di scienze naturali e del Museo cantonale di storia naturale |
| Editor | Società Ticinese di Scienze naturali, Lugano/Svizzera, Svizzera |
| Year | 2012 |
| Type | Articolo in rivista |
| Authors | Nicoletta Riccardi; Martina Austoni; Lyudmila Kamburska; Giuseppe Morabito |
| Text | 224374 2012 plankton alpine lakes alpine biodiversity southern Swiss Alps Phytoplankton and zooplankton species distribution in the high altitude lakes of the Piora valley Canton Ticino, Switzerland . Nicoletta Riccardi; Martina Austoni; Lyudmila Kamburska; Giuseppe Morabito CNR Institute of Ecosystem Study Species composition of phyto and zooplankton assemblages in four lakes of altitude between 1850 and 2377 meters in the Piora valley were studied in July 2010. All the lakes were dominated by diatoms and chlorophytes, both recorded with a similar number of taxa, except in Lake Tom, where a lower number of taxonomic units were found among the chlorophytes. The taxonomic composition of the phytoplankton assemblage was basically the same in all the lakes sampled. The zooplankton composition was evaluated both on the samples collected during the 2010 survey and on samples collected in previous years from lakes of the same area. Totally ten lakes were compared. The taxonomic composition varied not only among the lakes, but, as can be expected, also within each lake during the different years. In terms of zooplankton diversity, the highest species richness was found in Lake Cadagno. Rotifers were the most represented as a number of taxa in all the lakes sampled, except in Lake Pecian. The rate of change in species composition along the altitudinal gradient points to an altitudinal threshold partitioning the lakes into two groups characterized by relatively different zooplankton assemblages. However, whether is altitude the major structuring factor for zooplankton species composition in the Piora lakes, or likely local factors are more effectively acting in each site is a question that cannot be answered by this preliminary study. La composizione in specie delle associazioni fito e zooplanctoniche di quattro laghi della Val Piora compresi in un intervallo altitudinale da 1850 a 2377 m e stata oggetto di uno studio condotto nel mese di luglio 2010. L analisi dell associazione fitoplanctonica ha evidenziato una dominanza delle diatomee e delle cloroficee in tutti i laghi esaminati. Inoltre, in tutti i laghi il numero di unita tassonomiche era simile, ad eccezione del Lago Tom con un minor numero di taxa di cloroficee. Pertanto, la composizione tassonomica del fitoplancton appariva sostanzialmente omogenea. La composizione dello zooplancton e stata valutata sia dall analisi dei campioni raccolti nel 2010 che dall analisi di campioni raccolti in anni precedenti nei laghi dell area di studio. In totale sono stati confrontati dati ottenuti da 10 laghi evidenziando differenze nella composizione tassonomica sia tra laghi che tra anni diversi. Nel Lago Cadagno e stato rinvenuto il maggior numero di specie. I rotiferi rappresentano la maggioranza delle specie in tutti i laghi, ad eccezione del Lago Pecian. La sostituzione di specie lungo il gradiente altitudinale sembrerebbe indicare una soglia che segnerebbe la ripartizione dei laghi in due gruppi caratterizzati da una composizione tassonomica relativamente differenziata. Tuttavia, questo studio preliminare non ha la pretesa ne la possibilita di valutare se l altitudine sia il fattore piu determinante per la composizione tassonomica dello zooplancton nei laghi della Val Piora oppure se, come probabile, caratteristiche locali, tipiche di ciascun lago, abbiano maggiore rilevanza. 11 Published version Articolo 2012_Memorie_STSN_79_93.pdf Articolo in rivista Societa Ticinese di Scienze naturali Memorie della Societa ticinese di scienze naturali e del Museo cantonale di storia naturale Memorie della Societa ticinese di scienze naturali e del Museo cantonale di storia naturale martina.austoni AUSTONI MARTINA lyudmilatodorova.kamburska KAMBURSKA LYUDMILA TODOROVA giuseppe.morabito MORABITO GIUSEPPE nicolettarita.riccardi RICCARDI NICOLETTA RITA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |