A dataset containing the abundances of 56 Trichoptera species captured in 1984 during 100 consecutive days in 22 emergence traps (sites) along the outflow stream of Lake Cromwell (45°59'13" N, 73°59'47" W) on the territory of Station de Biologie des Laurentides (Université; de Montéal).
data(trichoptera)A data frame with (10 x 22) = 220 rows and 58 variables (Site, Date, and 56 species).
Row order in the data file: the 22 traps (sites) are nested within the 10 survey periods.
Data provided by Prof. Pierre-Paul Harper, Département de sciences biologiques, Université de Montréal.
The original daily data collected at each site were pooled into 10 survey periods for the study of Legendre et al. (2010) in order to reduce the very high proportion of zeros in the original data matrix. The 22 traps form a regular transect, with geographic positions 1 to 22.
Legendre, P., M. De Caceres & D. Borcard. 2010. Community surveys through space and time to assess environmental changes: testing space-time interaction in the absence of replication. Ecology 91: 262-272.