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    Vegetation patterns and primary succession on sea-born volcanic islands (Santorini archipelago, Aegean Sea, Greece)

    Access Status
    Fulltext not available
    Authors
    Mucina, Ladislav
    Dimopoulos, P.
    Raus, T.
    Tsiripidis, I.
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Dimopoulos, P., Raus, T., Mucina, L. & Tsiripidis, I. 2009. Vegetation patterns and primary succession on sea-born volcanic islands (Santorini archipelago, Aegean Sea, Greece). Phytocoenologia 39(4): 1-14.
    Faculty
    School of Agriculture and Environment
    Faculty of Science and Engineering
    Department of Environmental Biology
    Remarks

    This item may be available from Professor Ladislav Mucina

    Email: L.Mucina@curtin.edu.au

    URI
    http://hdl.handle.net/20.500.11937/33687
    Collection
    • Curtin Research Publications
    Abstract

    Santorini (S Cyclades, Greece) is one of the active volcanoes of the South Aegean volcanic arc, with more than 12 major eruptions during the past 250,000 years. Our research, using a set of 93 phytosociological releves, focused on the two volcanic islands of Palea Kameni (PK) and Nea Kameni (NK), differing in age and history of vegetation development. Numerical-classification techniques were used to define plant communities, and Redundancy Analysis (RDA) was used to investigate the main environmental gradients and identify the explanatory variables with a unique significant contribution to the explanation of the communities’ floristic composition. In RDA environmental factors such as altitude, slope inclination, relief, aspect, age of geological substrate, distance from the shore, and selected Ellenberg Indicator Values (EIVs) were used. In order to test the robustness of the RDA results, principal components analysis was applied to the relevés data set as well. Partial RDAs (variance partitioning) were also applied to investigated the proportion of variance attributed to the age of the lava substrate as compared to the rest of environmental factors. The classification revealed seven plant communities (four on PK and three on NK), described in terms of unique species composition, characteristic ecology, and distribution. Three of the communities were dominated by perennials (all found on PK), while the other communities were built prevalently of therophytes (all communities found on NK and one occurring on PK). The age of lava substrate was found among the most important and statistically significant variables. Furthermore, EIVs for light, nitrogen, reaction, and salinity werefound to explain relatively high and statistically significant proportions of species data variance. However, the proportion of variance attributed purely to the age of lava substrate was by far smaller than that attributed to the rest explanatory variables. Conclusively, we suggest that the formation of local pioneer vegetation on the studied volcanic islands is not solely controlled by the age of the substrate (“maturation” of the communities through saturationof their local species pools), but it is also under strong control of factors such as the distribution of ashes after the recent volcanic eruptions, and the chemical and physical properties (e.g. nutrient content) of the soils formed by the deposition of the ashes.

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