One species, Helophilus trivittatus, has occurred in exceptional numbers. It is a big brightly coloured hoverfly that obviously attracts attention from photographers as can be seen in Figure 1. The simple numbers in Figure 1 suggest a huge rise in numbers of records, but 2012 has also been an exceptional year for photographic records in which the level of recording grew by 33% in this one year. So, Figure 2, which shows the proportion of each year's records since 2004 is more representative.
|Figure 1. Numbers of photographic records of Helophilus trivittatus from 2004 to 2012|
|Figure 2. The proportion of photographs of Helophilus trivittatus in each year from 2004 to 2012|