Abstract
We explored phytoplankton communities from a functional perspective in two connected but hydro-morphologically distinct basins during the ice-free period in the cold and oligotrophic Lake Tovel, Italy. Despite the absence of dispersal barriers, we expected a clear separation of the phytoplankton communities between basins based on their physical distinctions: a shallow and a deep basin with low and high water residence time, respectively. To investigate seasonal succession and spatiality, taxa were classified according to their functional groups (FGs) and traits (FTs). Relationships between functional classifications and environmental parameters were assessed by non-metric multidimensional scaling integrated with cluster analysis. Clustering of FGs and FTs was complementary and reflected different hydrological conditions of each basin: (i) more stable conditions and higher functional variation across seasons in the deep basin and (ii) less stable conditions and lower functional variation across seasons in the shallow basin. Phytoplankton functional composition evidenced how local conditions selected for corresponding functional attributes adapted to each basin’s environment. These results, together with the presence of rare, cold-tolerant taxa such as Pseudotetraëdriella kamillae and Stephanocostis chantaicus, highlighted the need for long-term phytoplankton studies, and the creation of a FG that includes cold-adapted, oligotrophic taxa.
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Acknowledgments
The first author was supported by a Short-Term Scientific Mission (STSM) and travel grant funded through the EU Cost Action ES1201 NETLAKE (Eleanor Jennings, Chair); this study was also supported by research activity funded by FEM–CRI (LTER Tovel). We are also grateful to Judit Padisák for taxonomic confirmation of the eustigmatophyte Pseudotetraëdriella kamillae. The authors thank the GIS Agrometeorology group (FEM) and especially Stefano Corradini for weather data. The authors also thank two reviewers for useful comments.
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Guest editors: Luigi Naselli-Flores & Judit Padisák / Biogeography and Spatial Patterns of Biodiversity of Freshwater Phytoplankton
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Cellamare, M., Lançon, A.M., Leitão, M. et al. Phytoplankton functional response to spatial and temporal differences in a cold and oligotrophic lake. Hydrobiologia 764, 199–209 (2016). https://doi.org/10.1007/s10750-015-2313-2
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DOI: https://doi.org/10.1007/s10750-015-2313-2