Saturday, 1 February 2025

Record of Scarce Blue-tailed Damselfly in Grove, June 2024

A remarkable record of a Scarce Blue-tailed Damselfly has belatedly come to light while I was looking through iRecord entries for VC22 (Berkshire) for last year. It was on 6 June 2024, from a location in Grove, near Wantage, given as SU398902. 

[Note that Vice County 22 includes the large section of what has been Oxfordshire ever since the re-organisation of county boundaries in 1974 - everywhere to the right of the River Thames, looking downstream].

The photos (for one see below) appear to confirm the identity, and look as though they were taken in the observer's garden! Unfortunately there is no valid observer name nor contact details for this record. 

If by any chance the observer reads this post, I'd be delighted to him from him/her!

Grove is some distance from Didcot, the only other known location for this rare species in southern Oxfordshire, and even further from the other sites in Banbury. 

In Oxon, this species is currently usually found only at stormwater ponds, so it is possible there is a breeding colony nearby, yet to be discovered. Something to bear in mind in June this year!

Scarce Blue-tailed Damselfly in Grove, 6 June 2024

Saturday, 11 January 2025

Steeple Aston - Southern Hawker emergences 2020-2024

Showing remarkable dedication, Deborah Dunn has now completed five years of daily monitoring of Southern Hawker emergences and exuviae at her small garden pond. 

The plot below shows weekly exuviae counts for the five years 2020-2024. Feedback from Deborah suggests that the lower totals in 2020 and 2021 can probably be attributed to shorter monitoring periods. 

Since 2022, the overall annual totals have shown remarkable consistency, year on year, only varying by 4 (7%), and the mean dates for the exuviae varied by only a week. The poor weather in 2024 may have led to the mean exuviae date (19 July) being about a week later than for 2022 and 2023. 

It is also notable that in 2024 Deborah recorded 18 emergences - her highest total so far. 

Weekly exuviae counts from a small garden pond in Steeple Aston for 2020 - 2024