20.500.12556/DKUM-88134 The importance of thermally abnormal waters for bioinvasions - a case study of Pistia stratiotes Thermally abnormal waters represent safe sites for alien invasive plants requiring warmer conditions than provided by the ambient temperatures in the temperate zone. Therefore, such safe sites are frequently inhabited by tropical and sub-tropical plants. By performing a literature review we assessed that at least 55 alien aquatic plant taxa from 21 families were found in thermally abnormal waters in Europe. The majority of these taxa are submerged or rooted macrophytes. Six taxa are listed as quarantine pests according to EPPO. Among these, Pistia stratiotes is present in seven European countries, most of the records of this presence being recent. We studied P. stratiotes in a thermally abnormal stream where a persistent population was able to survive harsh winters. Models showed that the optimum temperature for P. stratiotes biomass was 28.8 ± 3.5 ◦C. Here, we show that air temperatures had a higher influence on the photosynthetic efficiency of P. stratiotes, estimated by chlorophyll fluorescence measurements, than did water temperatures. Generally, growth, and consequently surface cover for free-floating plants, cannot be explained solely by thermally abnormal water temperatures. We conclude that even though the majority of thermophile alien plant occurrences resulted from deliberate introductions, thermally abnormal waters pose an invasion risk for further deliberate, accidental, or spontaneous spread, which might be more likely for free-floating macrophytes. macrophytes alien invasive plants chlorophyll fluorescence plant mass temperature gradient makrofiti tujerodne invazivne rastline fluorescenca klorofila rastlinska masa temperaturni gradient true true true MDPI Angleški jezik Slovenski jezik Znanstveno delo 2024-04-10 03:49:13 2024-06-05 14:43:07 2024-07-16 12:06:35 0000-00-00 00:00:00 2023 0 0 Str. 1-22 Št. 3, št. članka 421 Letn. 15 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-01-31 2023-03-09 2023-03-13 581.1 145353731 10.3390/d15030421 1424-2818 RAZ_Sajna_Nina_2023.pdf RAZ_Sajna_Nina_2023.pdf 1 3B12E666B6B25DB680A01FF6FFE71ACE adcf1ef9746569d056c44211143cb7c387aab5ad9dbf9821b506ceff655e5f98 33544fb2-2338-11ef-9e9b-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=180228 https://doi.org/10.3390/d15030421 0 7ee81dd6-2338-11ef-9e9b-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=180229 Fakulteta za naravoslovje in matematiko 0 0 0