The state of the Watsonian Yorkshire database for the aculeate Hymenoptera: Part 2 - the twentieth century to the 1960s

摘要

From the 1900s until the 1960s, 144 new aculeates (listed in the Appendix available on the YNU website at: https://www.ynu.org.uk/naturalist) were recorded in Watsonian Yorkshire compared with 131 during the 19th century (Archer, 2018). Figures 1 and2 (p40) show the number of first records of species per decade and the number of first records of species of the Chrysidoidea, Vespoidea and Apoidea (wasps and bees) per decade, respectively. Figure 1 shows a decline in the recording of new species per decade. Figure 2 also shows this decline, particularly for the Apoidea-Bees, but not for the Chrysidoidea, which show an increase of first species recording during the 1930s and 1940s.