BTBW_annual_data

Annual summaries of field data on black-throated blue warbler reproduction (1986-2010) gathered at the Hubbard Brook Experimental Forest in Thornton, NH, USA. Notes on column headings are as follows: prop.F.ASY = proportion older (ASY) females; Acsa.budburst = day of sugar maple (Acer saccharum) budburst (Day 1 = 01 January); Acsa.canopy = day of nearly complete (90%) expansion of sugar maple leaves; arrival.50 = median arrival date of male black-throated blue warblers; clutch.init.50 = median clutch initiation date of black-throated blue warblers; mean.cats = mean dry caterpillar biomass (mg/8000 leaves) across the whole season; ln.mean.cats = seasonal mean dry caterpillar biomass, natural log-transformed; mean.first.cats = mean dry caterpillar biomass (mg/2000 leaves) in the early season; ln.first.cats = mean dry caterpillar biomass (mg/2000 leaves) in the early season, natural log-transformed; high_day = day of the count with the highest caterpillar biomass; density = breeding black-throated blue warblers per 64ha; survival = daily nest survival rate; mean.fledged = average annual reproductive success (mean number of young fledged per pair per year)