Survival and expansion of Pistia stratiotes L. in a thermal stream in Slovenia

Šajna, Nina; Haler, Maja; Škornik, Sonja; Kaligarič, Mitja

doi:10.1016/j.aquabot.2007.01.012

Cited by 58 publications

(41 citation statements)

References 11 publications

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“…In terms of growth forms, enhanced growth rates resulting from increased temperature and nutrient availability may also increase competition and give advantage to tall competitive species, and ultimately promote phytoplankton and turbid water stages to the detriment of clear macrophyte dominated water stages (Schippers et al 2004;Mooij et al 2005). The progression of invasive species may also be favoured (Tockner and Stanford 2002) because of increased winter temperatures that may increase plant survival (Hussner and Losch 2005;Sajna et al 2007), and because certain invasive species colonize faster at higher temperatures (Mckee et al 2002;Hussner 2009). Although only few data are available, previous studies have suggested that species composition may vary due to the varying thermal requirements for seeds to germinate (Acosta et al 1998).…”

Section: Temperaturementioning

confidence: 99%

Response of aquatic plants to abiotic factors: a review

2010

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This review aims to determine how environmental characteristics of aquatic habitats rule species occurrence, life-history traits and community dynamics among aquatic plants, and if these particular adaptations and responses fit in with general predictions relating to abiotic factors and plant communities. The way key abiotic factors in aquatic habitats affect (1) plant life (recruitment, growth, and reproduction) and dispersal, and (2) the dynamics of plant communities is discussed. Many factors related to plant nutrition are rather similar in both aquatic and terrestrial habitats (e.g. light, temperature, substrate nutrient content, CO 2 availability) or differ markedly in intensity (e.g. light), variations (e.g. temperature) or in their effective importance for plant growth (e.g. nutrient content in substrate and water). Water movements (watertable fluctuations or flow velocity) have particularly drastic consequences on plants because of the density of water leading to strong mechanical strains on plant tissues, and because dewatering leads to catastrophic habitat modifications for aquatic plants devoid of cuticle and support tissues. Several abiotic factors that affect aquatic plants, such as substrate anoxia, inorganic carbon availability or temperature, may be modified by global change. This in turn may amplify competitive processes, and lead ultimately to the dominance of phytoplankton and floating species. Conserving the diversity of aquatic plants will rely on their ability to adapt to new ecological conditions or escape through migration.

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Section: Temperaturementioning

confidence: 99%

Response of aquatic plants to abiotic factors: a review

2010

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“…However, due to the warmer climate in Southern Europe, the increased numbers of aquaculture farms from which escapes are regularly reported (Ahyong & Yeo, 2007;Vázquez, 2008), and to its resistance to low winter temperatures (Karplus et al, 1998), the establishment of populations in the wild in Europe was expected, but with an estimated "medium" ranked invasion risk (Souty-Grosset et al, 2006;Tricarico et al, 2010). Other possibilities in Europe are specific habitats, for example thermal hot water springs, which can hold abundant and sustainable populations of tropical invaders, even in colder temperate climates (Šajna et al, 2007;Petutschnig et al, 2008;Piazzini et al, 2010).…”

Section: Introductionmentioning

confidence: 96%

The First Tropical Alien Crayfish Species in European Waters: The Redclaw Cherax Quadricarinatus (Von Martens, 1868) (Decapoda, Parastacidae)

Jaklič¹,

Vrezec²

2011

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A population of the tropical redclaw crayfish Cherax quadricarinatus (Von Martens, 1868) is reported here for the first time in Europe, despite some occasionally found released individuals found previously in some European countries. The redclaw population was first found in 2009 in the natural river oxbow lake Topla, with thermal hot water springs, in eastern Slovenia (Central Europe). The species is known to be invasive in tropical and subtropical regions, but this is the first record from the temperate climate zone. During intensive sampling with traps, 15 individuals were caught that seemed to belong to a sex-and age-structured population. The low abundance indicated that the population was still in the growth phase of colonization, or that habitat conditions for the species in the oxbow lake were suboptimal. The redclaw individuals were found at temperatures of up to 40 • C, but the bulk of the population with sexually mature individuals was restricted to regions between 21 and 31 • C. According to the modelled limits of annual water temperature fluctuation, further expansion of the redclaw is expected in the thermal oxbow lake, but invasion to adjacent rivers is less probable at least under current climatic conditions. As a rapidly growing large crayfish, the redclaw could pose a threat to local ecosystems in specific thermal water bodies with unique fauna and flora. Future studies are important to define threats of tropical invaders in specific thermal freshwater ecosystems in Europe. RÉSUMÉUne population d' « écrevisse bleue » tropicale Cherax quadricarinatus (Von Martens, 1868) est signalée ici pour la première fois en Europe, malgré quelques individus relâchés, trouvés occasionnellement dans quelques pays européens. Cette population a été rencontrée pour la première fois dans le lac Topla (ancien bras mort de la rivière Sava), qui reçoit des sources thermales d'eau chaudes, en Slovénie orientale (Europe Centrale). L'espèce est connue invasive dans les régions tropicales et subtropicales, mais c'est sa première mention dans une zone de climat tempéré. Au

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“…It seems E. canadensis mostly occupies standing waters, though it does not yet exhibit a tendency to cover larger surfaces. Special case of invasion of this habitat in Slovenia is Pistia stratiotes that survives in thermal stream (52) but this habitat is not included in vegetation database.…”

Section: Discussionmentioning

confidence: 99%