5. Distribution Maps

Four types of colour distribution maps for each species in BC were produced in both jpg and pdf format; they show BC distribution based on the collections of the Royal BC Museum and Spencer Entomological Museum, University of BC. Map 1 is the basic distribution map. Map 2 separates records made before 1996 and those made from 1996 to 2004. This highlights the effectiveness of intensive surveys in improving our understanding of dragonfly distribution in BC. Map 3 shows species distribution and the relative abundance of collection records in each 1/50,000 NTS map sheet in BC. Map 4 shows the same, except the number of localities in each map sheet, rather than total specimen records, is shown. Each map also presents a histogram of collection records of adult dragonflies graphed in 10-day periods throughout the year. These represent the known flight period of the species. Two summary maps representing the combined data from all species used in Maps 3 and 4 were also produced and are included herein (Figs. 18 and 19). A map showing annual survey regions was also made (Fig.1). Examples of all types of distribution maps are shown in the species accounts in Appendix 4. The content of these maps, although dealing with all BC, would have been much less useful without the results of detailed inventories in the North.

Figure 18. Species distribution and the relative abundance of collection
records in each 1/50,000NTS map sheet in BC.

Figure 19. Species distribution and the relative abundance of collection
localities in each 1/50,000 NTS map sheet in BC.