|Table 1. Composition of the records at Tribe level.|
The dominant species in most samples were the genera Melanostoma, Platycheirus and Sphegina, which is not entirely surprising bearing in mind that sweeping tends to yield far more of these genera than basic visual searches. Generating a decent list does, however, involve retaining quite large numbers of specimens because there is always a dominant species and a tail of species that are far scarcer. The lists tell their own story, with good representation of species in Platycheirus, including many of those that one sees relatively infrequently further south (Table 2). One that I would single out is P. podagratus, which I think is a relatively early species and was probably on the wane when I arrived. My records mainly comprise females, so I suspect males were substantially over.
What is especially noticeable from the records is the relative lack of Syrphini, which are far more likely to be recorded as flower visitors and by active searching. Similarly, the Cheilosini were relatively poorly represented; I think for similar reasons.
|Table 2. Species list for the trip, with numbers of records (record = occurrence of individual genders, so the actual numbers will be lower)|
|Figure 1. Coverage at 10km resolution|