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