engleski

Distribution and ecology of Elodea canadensis Michx. and Elodea nuttallii (Planch.) H. St. John in Croatia

Elodea canadensis Michx. and Elodea nuttallii (Planch.) H. St. John, two invasive aquatic plants from North America, have coexisted in European waterways since the early 20th century. They were first documented in Croatia in 1894 and 2006, respectively. New localities of both species were discovered during the study which ran from 2016 to 2022 as part of the annual Water Framework Directive monitoring that covered the entire Croatian territory (786 sampling points in total). Elodea canadensis was found in 30 sampling points, mostly in rivers and E. nuttallii in 15 sampling points, mostly in channels. Nearly three quarters (72, 5%) of all Elodea sampling points are in the Pannonian ecoregion, while 15% are in the Continental-Dinaric region. Elodea canadensis was discovered for the first time in the Mediterranean-Dinaric region in five sampling points (12, 5% of records) in the river Cetina. Chemical and hydromorphological analyses were performed, as well as plant relevés. Fitting multivariate models to species abundance revealed the ecological reaction of E. canadensis and E. nuttallii to environmental descriptors.

Elodea ; freshwater ; aquatic vegetation ; invasive

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