The Dutch Dragonfly Monitoring Scheme started in 1997 with a probationary year. From 1998 onwards the number of monitoring plots increased quickly to more than 325 in 2000. About 40% of the plots concerns single species sites, which are counted three times a year during the peak of occurrence of the counted species. At all other sites all dragonfly species are counted nine times a year. Countings are mostly done by volunteers between May and September using a standardised method. Results are used to calculate yearly indices for each species and for conservation purposes for endangered species like Aeshna viridis and Calopteryx virgo. In addition, results are also used to evaluate conservation measures. In the city of Gouda for instance, dragonfly numbers and diversity proofed to be higher along ecologically restored banks in the city compared with non-restored localities. Although more monitoring plots are needed for a more powerful analysis, it is concluded that the Dutch Dragonfly Monitoring Scheme is a useful tool in the conservation and protection of dragonflies and their habitats in The Netherlands.

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Nederlandse Vereniging voor Libellenstudie

Dick Groenendijk, Robert Ketelaar, & Calijn Plate. (2001). Het Landelijk Meetnet Libellen: enkele resultaten na ruim drie jaar tellen. Brachytron, 5(1/2), 19–27.