engleski

PRELIMINARY MAPPING OF THE INVASIVE ALIEN SPECIES Erigeron annuus (L.) Pers. IN THE TOWNS OF ZAGREB COUNTY

Preliminary mapping of the invasive alien species Erigeron annuus (L.) Pers., annual fleabane, in all nine towns of the Zagreb County was conducted during the year 2012. Research was performed on plots of 250  250 m2. In total, among 541 researched plots, the species E. annuus was found on 362 plots (66.9%). In Ivanić Grad, the species was established on 44 of 73 surveyed plots (60.3% ), in Jastrebarsko on 32 of 48 plots (66.7%), in Sveti Ivan Zelina on 28 of 44 plots (63.6%), in Sveta Nedjelja on 18 of 31 plots ž (58.1%), in Velika Gorica on 48 of 76 plots (63.2%), in Vrbovec on 29 of 48 plots (60.4%), in Zaprešić on 31 of 58 plots (53.4%), in Dugo Selo on 28 of 54 plots (51.9%), and in Samobor on 85 of 109 surveyed plots (78%). The comparative analysis of spatial distribution of E. annuus between Dugo Selo and Samobor, based on the repeated research in 2016, showed that the number of new plots with E. annuus has increased by 7 plots (12.96%) in Dugo Selo, and by 11 plots (10.1%) in Samobor. In all towns, particular appearance on the edge of urban areas can be noticed, though it is also present in all urban centers. This preliminary research has pointed to the need for more intensive monitoring and control of distribution and spread of this aggressive weed and invasive plant, in order to reduce its negative impact on biodiversity of the Zagreb County.

annual fleabane ; invasive alien weed ; spatial distribution ; urban areas ; Croatia

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