Ants of national parc 'Hollandse Duinen' (Hymenoptera: Formicidae).
In 2018, a '5000 species year' was held in national pare 'Hollandse Duinen', with the aim to find as many species as possible. This region in the province of Zuid-Holland encompasses an area of 43 km long with open sea, beaches, dunes, urban areas, city pares, estates, and agricultural fields. Ants were inventoried with different sampling techniques, of which hand sampling yielded most results. In total, 27 species were identified, including one threatened species (Myrmica specioides), one species for which the Netherlands (probably) holds the highest population density in Europe (Temnothorax albipennis), two wood ant species (Formica rufa and F. polyctena), two invasive exotic species (Lasius neglectus and a species from the Tapinoma nigerrimum-complex) and two indoor exotic species (Hypoponcra ergatandria and Technomyrmex vitiensis). Seven species that have historical records in the region have not been found in 2018, mostly because of their hidden life-style or rarity in the region.