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Ekologie a diverzita půdních rozsivek ostrova Nový Amsterdam a ostrova Svatého Pavla (TAAF, Jižní Indický oceán) = Ecology and diversity of soil diatoms on Ile Amsterdam and Ile Saint-Paul (TAAF, Southern Indian Ocean)
Cahová, B. (2019). Ekologie a diverzita půdních rozsivek ostrova Nový Amsterdam a ostrova Svatého Pavla (TAAF, Jižní Indický oceán) = Ecology and diversity of soil diatoms on Ile Amsterdam and Ile Saint-Paul (TAAF, Southern Indian Ocean). MA Thesis. Masarykova univerzita, Prírodovedecká Fakulta: Brno . 92 pp.
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Document type: Dissertation
Keyword
    Bacillariophyceae [WoRMS]
Author keywords
    diatoms; diversity; biogeography; sub-Antarctic region; Amsterdam; Saint-Paul; soil; Southern Indian Ocean;
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  • Cahová, B.
Abstract
    In this thesis we examine species richness and biogeography of soil diatoms of two small isolated volcanic islands called Amsterdam Island and Saint-Paul Island. The thesis deals with the composition of diatom communities and environmental factors influencing them. A series of physicochemical variables have been measured on Amsterdam Island. Part of the thesis is also a comparison of observed diatom flora with diatom flora of other sub-Antarctic islands located in Southern Indian Ocean. During the study, 76 soil samples from Amsterdam Island and 18 soil samples from Saint-Paul Island were analysed. All 193 diatom taxa were found on both islands. The results of community analysis showed that moisture, pH and conductivity are the major factors influencing the composition of diatom communities of Amsterdam Island. According to biogeographical analysis, at least 15 % of all observed taxa are endemic species of the studied islands and nearly 14 % have a limited sub-Antarctic distribution.
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