Long-term trends in abundance of Lepidoptera larvae at Hubbard Brook Experimental Forest and three additional northern hardwood forest sites, 1986-2021

Numbers and lengths of Lepidoptera larvae (caterpillars, all species)
were censused on shrub level foliage at biweekly intervals from late
May/early June through late July/early August each year. Measurements
were conducted on the Main bird plot in the Hubbard Brook Experimental
Forest and on three additional plots within the White Mountain National
Forest from 1986-1997. These data were gathered as part of the Hubbard Brook Ecosystem Study
(HBES). The HBES is a collaborative effort at the Hubbard Brook
Experimental Forest, which is operated and maintained by the USDA Forest
Service, Northern Research Station.