Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | The unicellular freshwater cyanobacterium Synechococcus and mixotrophic flagellates: evidence for a functional association in an oligotrophic, subalpine lake |
| Abstract | 1.We applied the Reynoldss approach to the study of phytoplankton ecology through functional associations of species to identify possible algal species which associate with the freshwater cyanobacterium Synechococcus. Previously an association among Synechococcus spp. and small-celled chlorophytes (Association Z) has been recognized by evaluating phytoplankton associations according to functional criteria. 2.Biomass data for phytoplankton and picocyanobacteria from Lago Maggiore spanning more years were organized in a matrix and a cluster analysis was performed. The results showed four groups separated at a linkage distance of 0.20. Mixotrophic species which clustered with Synechococcus spp. were Ceratium hirundinella, Chrysochromulina parva, Cryptomonas erosa, Cryptomonas ovata, Dinobryon bavaricum, Dinobryon sociale, Rhodomonas minuta and Uroglena americana. The redundance analysis (RDA) consolidated the association of Synechococcus with C.hirundinella and R.minuta showing greater probability of occurrence than random aggregates of species. 3.The association Synechococcus spp. - C.hirundinella also appeared from temporal variation of their biomass. In early summer both the species increased at the same time; later, the peak of C.hirundinella (potential predator) coincided with a minimum of Synechococcus spp. suggesting a possible predator-prey interaction. This implied that phytoplankton assemblages which form a functional group can not only have similar adaptations and requirements but can also exhibit trophic interactions. 4.We propose to enlarge the Association Z and create Association ZMX (where MX stands for mixotrophs) which would include Synechococcus spp. and C.hirundinella as the most representative of the mixotrophic species found in the oligotrophic Lago Maggiore. |
| Source | Freshwater biology (Print) 51, pp. 263–273 |
| Keywords | Freshwater Synechococcusfunctional associationmixotrophic flagellatesCeratium hirundinella |
| Journal | Freshwater biology (Print) |
| Editor | Blackwell Scientific Publications., Edinburgh, Regno Unito |
| Year | 2006 |
| Type | Articolo in rivista |
| Authors | Callieri C.; Caravati E.; Morabito G.; Oggioni A. |
| Text | 52911 2006 ISI Web of Science WOS 000234667900006 Freshwater Synechococcus functional association mixotrophic flagellates Ceratium hirundinella The unicellular freshwater cyanobacterium Synechococcus and mixotrophic flagellates evidence for a functional association in an oligotrophic, subalpine lake Callieri C.; Caravati E.; Morabito G.; Oggioni A. CNR Istituto Studio Ecosistemi, Verbania Pallanza 1.We applied the Reynoldss approach to the study of phytoplankton ecology through functional associations of species to identify possible algal species which associate with the freshwater cyanobacterium Synechococcus. Previously an association among Synechococcus spp. and small celled chlorophytes Association Z has been recognized by evaluating phytoplankton associations according to functional criteria. 2.Biomass data for phytoplankton and picocyanobacteria from Lago Maggiore spanning more years were organized in a matrix and a cluster analysis was performed. The results showed four groups separated at a linkage distance of 0.20. Mixotrophic species which clustered with Synechococcus spp. were Ceratium hirundinella, Chrysochromulina parva, Cryptomonas erosa, Cryptomonas ovata, Dinobryon bavaricum, Dinobryon sociale, Rhodomonas minuta and Uroglena americana. The redundance analysis RDA consolidated the association of Synechococcus with C.hirundinella and R.minuta showing greater probability of occurrence than random aggregates of species. 3.The association Synechococcus spp. C.hirundinella also appeared from temporal variation of their biomass. In early summer both the species increased at the same time; later, the peak of C.hirundinella potential predator coincided with a minimum of Synechococcus spp. suggesting a possible predator prey interaction. This implied that phytoplankton assemblages which form a functional group can not only have similar adaptations and requirements but can also exhibit trophic interactions. 4.We propose to enlarge the Association Z and create Association ZMX where MX stands for mixotrophs which would include Synechococcus spp. and C.hirundinella as the most representative of the mixotrophic species found in the oligotrophic Lago Maggiore. 51 Articolo pubblicato Callieri_et_al_Freshwat_Biol_51_263_276_2006 0.pdf Articolo in rivista Blackwell Scientific Publications. 0046 5070 Freshwater biology Print Freshwater biology Print Freshw. biol. Print alessandro.oggioni OGGIONI ALESSANDRO CARAVATI EMANUELE cristiana.callieri CALLIERI CRISTIANA giuseppe.morabito MORABITO GIUSEPPE TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |