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Influence of abiotic factors on invasive behaviour of alien species Elodea nuttallii in the Drava River (Slovenia)

Published online by Cambridge University Press:  18 November 2013

Zdenka Mazej Grudnik ,
Ida Jelenko  and
Mateja Germ
Zdenka Mazej Grudnik*
Affiliation:
ERICo Velenje, Environmental Research and Industrial Co-operation Ltd., Koroška 58, 3320 Velenje, Slovenia
Ida Jelenko
Affiliation:
ERICo Velenje, Environmental Research and Industrial Co-operation Ltd., Koroška 58, 3320 Velenje, Slovenia
Mateja Germ
Affiliation:
Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, 1101 Ljubljana, Slovenia
*
*Corresponding author: zdenka.mazej@erico.si
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Abstract

The alien and potentially invasive species Elodea nuttallii was observed for the first time in Slovenia's Drava River in 2007, when its huge biomasses were observed at some locations. Changes in biomass of submerged macrophyte communities and abiotic factors such as water temperature, discharge and level were monitored at two impoundments of the Drava River (2009, 2010 and 2011). The correlations between abiotic factors and developed final biomass were assessed to determine if the level of abiotic factors has an impact on the final biomass and invasive behaviour of E. nuttallii. The results obtained showed that biomass of E. nuttallii was not excessive in 2009 and 2010, while in the year 2011 it developed huge biomass at locations, which were not directly exposed to the main water current. The biomass of Myriophyllum spicatum was also higher in 2011 in comparison with 2009 and 2010 but not in such high degree. The key factor for the development of the final biomass of E. nuttallii was the water temperatures in winter and spring and also the point at which water temperatures in spring surpassed 10°C. The invasive behaviour of E. nuttallii is expected in the years with higher temperatures in January and March and at the locations which are not directly exposed to the main water current. We assume that continuation of the deposition of silt in the impoundments of the Drava River could contribute to invasive behaviour of species E. nuttallii in the years with mild winters and warmer springs.

Keywords

Water temperaturedischargewater levelalien speciesElodea nuttalliiMyriophyllum spicatum
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 50 , Issue 1 , 2014 , pp. 1 - 8
Copyright
© EDP Sciences, 2013

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