Biodiversity Trends
1,517,863 species occurrence records spanning 1900 to 2026. Explore how recording effort has changed over 127+ years of wildlife monitoring across the Isle of Man UNESCO Biosphere Reserve.
Recording Effort Over Time
Total records per year with 3-year moving average
Records by Species Group
Top 12 taxonomic groups by total recorded occurrences
⚠️ Interpreting the Data
Recording effort does not equal population. Changes in the number of records per year reflect how much recording was happening — not whether species are increasing or declining. Several factors explain the patterns above:
Peak years = funded surveys
Spikes in recording often correlate with funded biodiversity survey programmes. The 1996 peak (85,713) reflects intensive island-wide habitat surveys, not a population boom.
COVID-2020 garden birdwatching
Lockdowns in 2020-2021 saw increased garden birdwatching across the UK, but the IoM's shorter lockdowns and reduced visitor numbers meant less overall field recording effort on the island.
Calf of Man observatory closure
The Calf of Man Bird Observatory closed after the 2004 season, removing a daily source of standardised bird records (438k total, 1959-2004). This single closure accounts for much of the apparent decline in bird records.
Volunteer fatigue, not decline
The downward trend in recent years largely reflects volunteer recorder fatigue and changing data submission platforms — not biodiversity loss. The Manx Biological Recording Partnership continues to coordinate recording efforts.
🤖 AI-Detected Anomalies
Coming Soon
AI analysis will be available once the GBIF import is complete and the Biosphere AI Advisor runs its first analysis. The advisor will identify species-level anomalies, unusual recording patterns, and potential conservation concerns.
More from Biosphere
Species data: NBN Atlas IoM · GBIF · Manx Biological Recording Partnership
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