Paper Details

Abstract

Invasive plant species establish in new habitats outside their natural ranges, often leading to ecological, economic, and public health impacts. Ambrosia artemisiifolia L. (ragweed), native to North America, is a major invasive species due to its competitive growth and highly allergenic pollen, which can induce hay fever and asthma. This study represents the first record of the species in Ordu province and aims to determine its distribution, habitat preferences, and population characteristics within Ordu, Türkiye. Field surveys were conducted during August–September 2021, the peak phenological period of the plant. Sampling took place at 1–2 km intervals along roadsides, rubble debris areas, riverbanks, non-agricultural lands, and hazelnut orchards. Plant density (plant/m²) and percent cover were measured using a 0.25 m² quadrat. The species was recorded for the first time in Ordu, forming populations at 20 locations: 16 on roadsides and four in rubble debris areas. A total of 27 plant species belonging to 12 families were identified in the surveyed habitats. A. artemisiifolia was the dominant species, with a mean cover of 24%. The most frequent co-occurring species were Conyza canadensis (L.) Cronquist, Sambucus ebulus L., Xanthium strumarium L. and Convolvulus arvensis L. Although ragweed was not detected in hazelnut orchards, the presence of all associated species as common weeds in these areas suggests a high future invasion risk. Overall, the findings indicate that ragweed is primarily concentrated in anthropogenic habitats, and its spread is likely facilitated by transportation and soil movement. Given its ecological competitiveness and strong allergenic impacts on human health, early detection, regular monitoring, and effective control strategies are essential to prevent further expansion

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