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... A list of IASs in Croatia is gathered in the Flora Croatica Database [11], within the module "Allochthonous plants", and currently counts 77 invasive foreign taxa (accessed on 25 June 2021). One of the most common species, Erigeron annuus (L.) Pers. is an annual, biennial, or perennial plant species from North America belonging to the Asteraceae family, with erect stems reaching heights of 40-150 cm [12]. The leaves are softly hairy, ovate at the base to linear-lanceolate at the top of the stem, and morphologically quite variable. ...
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Alongside the direct destruction of natural habitats and changes in land use, invasive species are considered one of the greatest threats to global biodiversity. Daisy fleabane Erigeron annuus (L.) Pers. is among the most widespread invasive plants in Croatia. Invasions of E. annuus may be aided by morphological variability, which this study investigates. The variability of life traits (stem height, fresh and dry leaf mass, length, width and leaf area, specific leaf area, and leaf dry matter content) was examined among 18 locations throughout Zagreb and Medvednica Mt. Overall, 87 plant specimens and 435 leaves were measured and analysed using univariate and multivariate statistics. Viable populations were recorded in diverse habitat types, mostly with marked human impact. We determined Grime’s CR plant life strategies for all, except for two localities with C/CR plant strategies. Two populations with a more pronounced competitive strategy had high leaf dry matter content, with smaller leaves and medium height stems. Significant differences between the localities were found, with the specific leaf area (SLA) and plant height being the most diverse. Despite its high morphological variability, daisy fleabane had a consistent CSR strategy, which likely enables its widespread invasions across variable habitats.
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