engleski

Comparison of Croatian invasive flora across biogeographical regions

We have analysed Croatian invasive flora present in four biogeographical regions, as defined in frame of NATURA2000 program, with respect to their corresponding Ellenberg’s indicator values, life form spectrum, Grime’s CSR-strategies and seed dispersal mechanism. Out of 66 invasive taxa, 26 of them (i.e. 39.4%) have been recorded in all four biogeographical regions. Therophytes prevailed among life forms, with at least 55.9% portion in sample. As expected, portion of geophytes was lowest in Mediterranean, and therophytes in Alpine region. Means of Ellenberg’s indicator values were quite similar among regions, with exception of Mediterranean region that, as expected, has highest value for temperature (7.24), while lowest for soil humidity (4.71) and soil fertility (5.69). Zoochory and anemochory were most frequent seed dispersal mechanism of invasive flora in all regions. Mediterranean region has highest share of anemochorous plants (32%) while lowest of autochorous ones (14.67%). When comparing Grime’s CSR strategies, Alpine region has highest share of invasive plant species with C (competitor) strategy (46.4%) and lowest of those with R (ruderal) strategy (7.1%) which was opposite to Mediterranean region in which there was largest share of R plants among four regions (14.3%) and lowest of C plants (34.3%). Obtained results shows that there are differences in invasive flora among biogeographical regions that indicate necessity for separate monitoring and control of invasive species across biogeographical regions.

Invasive flora; CSR strategies; Ellenberg; seed dispersal

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