Six herbarium samples did not show a clear ozone and temperature interaction in floral UV pigment in 1941-2017

We tested whether temperature changed the ozone slope for floral UV pigment in 934 exposed-anther herbarium specimens. Six tests covered Australia, Eurasia and North America in 1941-1985 and 1986-2017. Models used a product of species-centered ozone and temperature, with species-month controls, species time trends and location controls. All six species-cluster intervals included zero after correction for six tests. Equal-species weights and squared exposure terms also gave uncertain results. One species supplied 60% of residual product information in later North America. The archive does not establish a common interaction or its absence. Few species, nonrandom collection, source exposure errors and one archive limit inference. Total-column ozone differs from surface ozone pollution. Code, aggregate results, source hashes and a retrieval recipe are included; external raw data stay outside the package.

floral pigmentation · ozone · temperature · interaction · herbarium · observation bias · null result