The ASCII file ECOLMON.DAT contains the data used by Dennis et al. (1995)
in Ecological Monographs, volume 65, pages 261-281.  In this experiment,
there was a control (4 replicates) and three demographic perturbations
(3 replicates each).  The demographic perturbations were imposed at week 10.

The data are arranged in a comma-delimited format, with a CR/LF at the end
of each record.  All entries are numeric.  Each record contains the
following six fields:

Field 1:  Treatment coded as 1 = Control
                             2 = 100 adults added at week 10
                             3 = all adults removed at week 10
                             4 = all immatures removed at week 10

Field 2:  Replicate coded as 1 = A
                             2 = B
                             3 = C
                             4 = D (controls only)

Field 3:  Week at census (0, 2, 4, ..., 10, 10, 12, 14, ..., 38)
          (The two week 10 entries are pre- and post-perturbation.)

Field 4:  Number of L-stage beetles

Field 5:  Number of P-stage beetles

Field 6:  Number of A-stage beetles

There are a total of 273 records in the data set.