Trends in Butterfly Populations in UK Gardens
Annual abundance indices and trends for 22 butterfly species in UK gardens over 2007-2020, from the BTO Garden BirdWatch citizen monitoring scheme.
- Size
- 52.9 kB
- Format
- CSV, TXT
- License
- CC-BY-4.0
- Access
- Open Access
- Source
- Zenodo (record 7749600)
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Challenge
Which of the 22 garden butterfly species declined the most over 2007-2020, and did the declines cluster in particular years (e.g. after a bad summer)?
- Where to start
- Load the abundance-index CSV. Plot the index over time for a handful of species; then rank all species by their overall trend (start vs. end, or a fitted slope).
- What to share
- A trend ranking plus a time-series plot of the biggest winners and losers.
Share your results and questions in the forum. Challenges are open-ended — there's no single right answer.