The unicellular freshwater cyanobacterium Synechococcus and mixotrophic flagellates: evidence for a functional association in an oligotrophic, subalpine lake (Articolo in rivista)

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Label
  • The unicellular freshwater cyanobacterium Synechococcus and mixotrophic flagellates: evidence for a functional association in an oligotrophic, subalpine lake (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Callieri C.; Caravati E.; Morabito G.; Oggioni A. (2006)
    The unicellular freshwater cyanobacterium Synechococcus and mixotrophic flagellates: evidence for a functional association in an oligotrophic, subalpine lake
    in Freshwater biology (Print)
    (literal)
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  • Callieri C.; Caravati E.; Morabito G.; Oggioni A. (literal)
Pagina inizio
  • 263 (literal)
Pagina fine
  • 273 (literal)
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  • 51 (literal)
Rivista
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  • Sono state studiate le dinamiche spazio-temporali del fito e del picoplancton nel L.Maggiore. E’ stata trovata un’associazione funzionale tra il Synechococcus e alcuni importanti flagellati mixotrofi (C.hirundinella) basata su interazioni preda-predatore. Si è proposta una nuova associazione ZMX (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • CNR Istituto Studio Ecosistemi, Verbania-Pallanza (literal)
Titolo
  • The unicellular freshwater cyanobacterium Synechococcus and mixotrophic flagellates: evidence for a functional association in an oligotrophic, subalpine lake (literal)
Abstract
  • 1. We applied the Reynolds’s 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. (literal)
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