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Comparative study of Lemna minuta and Lemna minor - PhD study
22 Nov 2016
Comparative study of Lemna minuta and Lemna minor - PhD study On November 11, 2016 Ms. Simona Paolacci successfully defended her PhD thesis entitled “A comparative study of the invasive species
Lemna minuta and the co-generic native
Lemna minorâ€. [caption id="attachment_233" align="aligncenter" width="640"]
Smiles all around after the successful PhD defence. Dr. Simona Paolacci with examiner Prof. Klaus Appenroth (right) and supervisor Prof. Marcel Jansen (left).[/caption]
In her PhD thesis Simona explored the hypothesis that alien, invasive
Lemna minuta is an opportunistic (competitor/ruderal) species, while native
Lemna minor is more of a stress-tolerator. Some of the data in the thesis support this hypothesis. For example,
Lemna minor can grow under comparatively low light intensities and nutrient concentrations. In comparison,
Lemna minuta is better in taking advantage of high light intensities, and high nutrient concentrations. However, there is only limited support for the notion that
Lemna minor is more stress tolerant than
Lemna minuta. In fact, several stressors had less of an impact on
Lemna minuta than
Lemna minor. A key difference between the two species is the relative tolerance of
Lemna minor to low temperatures, which was associated with a relatively high growth rate of this species in the winter months. Thus, although
Lemna minuta outgrows
Lemna minor throughout the summer period, an early start after the winter assures a competitive advantage for the latter species, which can therefore co-exist with the alien invader. Simona Paolacci was funded by the
Irish Research Council (IRC) and jointly supervised by Dr. Simon Harrison and Prof. Marcel Jansen.