State of aculeate Hymenoptera in Watsonian Yorkshire: species gains and losses

摘要

With the development of electronic databases it is now possible quickly to access data showing the gains and losses of aculeate Hymenoptera in Watsonian Yorkshire. Originally this study was concerned with the number of records per species from the first and second fifty years of the 20th century (Archer, 2013b) but can now be extended to records from the 19th and 21st centuries (to 2013). The aim of this paper is to assess the gains and losses of aculeates with particular reference to the period from1950 onwards.