Spring warmth gave no clear summer catch-timing link in four English and Scottish beetle samples in 1993-2015

We tested whether warm springs were linked to earlier summer beetle catch timing. We used 294 location-year records from nine UK Environmental Change Network sites in England and Scotland in 1993-2015. We used actual trap intervals, removed selected trap-condition flags, and required all four summer months. We divided monthly catches by registered trap-days. Four models controlled location, linear time and summer rain. Spring temperature slopes ranged from -0.48 to +0.71 days per C. All four adjusted intervals included zero. Short intervals, higher effort and site deletion did not establish a common negative link. This result concerns summer community activity within a fixed window. It does not test the start of species activity. Country weather, species composition, selected records and few year groups limit inference. The package includes code, event evidence, monthly data, source hashes, checks and a figure. We did not test pollution or extreme weather.

carabid beetles · phenology · temperature · observation bias · pitfall traps · null result