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More than 75 percent decline over 27 years in total flying insect biomass in protected areas

Fig 3

Seasonal decline and phenology.

(A) Seasonal decline of mean daily insect biomass as estimated by independent month specific log-linear regressions (black bars), and our basic mixed effects model with interaction between annual rate of change and a quadratic trend for day number in season. (B), Seasonal phenology of insect biomass (seasonal quantiles of biomass at 5% intervals) across all locations revealing substantial annual variation in peak biomass (solid line) but no direction trend, suggesting no phenological changes have occurred with respect to temporal distribution of insect biomass.

Fig 3

doi: https://doi.org/10.1371/journal.pone.0185809.g003