Butterfly Populations at Risk After Hot Summer — SkimNews
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- Butterfly Conservation coordinated the 2026 Big Butterfly Count with nearly 5,000 participants in Devon recording 77,151 insects and almost 3,000 in Cornwall spotting 47,712
- Professor Richard Fox warned that despite current high adult butterfly numbers, extreme droughts like those in 1976 and 1995 previously caused long-term population damage from which some species never recovered
- Butterfly Conservation attributed strong 2026 counts to favorable spring conditions for caterpillars and hot, sunny summer weather preferred by adult butterflies
- Professor Richard Fox stated that 80% of UK butterfly populations have declined since the 1970s, making them less resilient to extreme weather events linked to climate breakdown
- Butterfly Conservation expressed concern that prolonged drought may have caused caterpillar food plants to wither prematurely, potentially leading to a population crash visible only in 2027
- The gatekeeper was the most commonly sighted butterfly in both Devon and Cornwall, followed by meadow brown and red admiral in Devon and red admiral and painted lady in Cornwall
- The painted lady had a standout year with 6,955 recorded in Devon and 6,033 in Cornwall, benefiting from its multi-generational migration from Africa across the Sahara and Mediterranean
Why it matters: With 80% of UK butterfly species already in decline since the 1970s, repeated extreme weather threatens irreversible losses. A crash would disrupt pollination networks and signal deeper ecosystem fragility, particularly as current hot conditions mask underlying risks to larval survival.
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