No interactions present.
Bouts of hovering did not last very long and there was a fair amount of sudden swooping going on. I can’t say if this involved physical interaction between individuals – (this comment coloured by the possibility that I might be looking at some form of competitive male grouping). In the composite image (of successive camera frames), a blurred object (presumably another flying insect) made an appearance close to a hoverfly. How far cameras can improve on this degree of resolution is an interesting question.
Assuming it is Melanostoma, it will be scalare from the length of the abdomen. I have found that males of this species are flying under trees, at about head height, as early as 4am on summer mornings, when I have been out bird ringing at that time.
My Flickr photos...
Thanks for the comment. We did have M. scalare on our site last year: “Hoverfly on Blackthorn Flowers” (to iSpot April 2nd, 2012).
I have been wondering if different hoverflies have a characteristic jizz when hovering, and by which they can be identified (analogy with plane spotting?). For this species, a wing pattern such as in image 2 perhaps? To be looked into sometime.
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707