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Non-indigenous freshwater plants

patterns, processes and risk evaluation

Larson, Daniel (2007). Non-indigenous freshwater plants. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2007:15
ISBN 91-576-7314-5
[Doctoral thesis]

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Abstract

Non-indigenous species (NIS) are species that are moved by man outside their native range. NIS that successfully pass through a number of invasion phases (i.e. introduction, establishment and invasion) are referred to as invasive species. Invasive species potentially cause severe environmental and economic impacts. This thesis highlights the invasion process of non-indigenous aquatic plant species. Patterns and processes in the establishment phase were assessed with a general focus. The importance of recipient area biodiversity for habitat invasibility was assessed by comparing native species richness in lakes where non-indigenous plant species had become established with non-invaded lakes. It was shown that habitats with established NIS on average had higher native species richness. Ecological niche modelling was used to test how the continental-scale distributions of non-indigenous freshwater plants in Europe might change during global warming. These models showed that species presently invasive in southern Europe can potentially establish also in northern Europe if the climate gets warmer. At the invasion phase, focus was more specific to a single species – the floating-leaved freshwater plant Nymphoides peltata. Microsatellite analyses of introduced N. peltata populations showed that six of seven sampled water systems contained a single genotype. Thus, where the species is introduced, vegetative reproduction constitutes the most important spreading mechanism. Impact of N. peltata on submerged species was assessed by using both a modelling approach and using traditional competition experiments. Both approaches showed that submerged plants were negatively affected by low to moderate N. peltata densities. This thesis contributes to a wider understanding of the invasion processes of non-indigenous freshwater plants in general, but of N. peltata in particular. Knowledge retrieved from more NIS case studies are needed before general patterns can be assessed.

Authors/Creators:Larson, Daniel
Title:Non-indigenous freshwater plants
Subtitle:patterns, processes and risk evaluation
Year of publishing :2007
Volume:2007:15
Number of Pages:42
Papers/manuscripts:
NumberReferences
ALLI. Larson, D. & Willén, E. Biodiversity vs. invasibility in Swedish lakes invadedby Elodea. In: Biological invaders in inland waters. Edited by F. Gherardi. Springer Science and Business Media (Accepted). II. Larson, D. Ecological niche modelling as a tool for predicting the effects of global warming on the distribution of non-indigenous aquatic plants in Europe (Submitted). III. Larson, D. 2007. Growth of three submerged plants below different densities of Nymphoides peltata (S. G. Gmel.) Kuntze. Aquatic Botany 86, 280-284. IV. Sahlin, U., Larson, D. & Nyberg, C.D. Dose-response impact assessment of non-indigenous aquatic plants and algae – a modelling approach (Manuscript). V. Larson, D. Reproduction strategies in introduced Nymphoides peltata populations revealed by genetic markers Aquatic Botany (Accepted).
Place of Publication:Uppsala
ISBN for printed version:91-576-7314-5
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:aquatic plants, aquatic weeds, hydrocharitaceae, menyanthaceae, plant introduction, plant establishment, environmental impact assessment, biodiversity, freshwater ecology, greenhouse effect, models, lakes, europe
Keywords:aquatic plant, Elodea, impact, invasive species, macrophyte, microsatellite, modelling, non-indigenous species, Nymphoides peltata, reproduction
URN:NBN:urn:nbn:se:slu:epsilon-1475
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-1475
ID Code:1339
Department:(NL, NJ) > Dept. of Environmental Assessment
Deposited By: Daniel Larson
Deposited On:14 Feb 2007 00:00
Metadata Last Modified:02 Dec 2014 10:11

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