The present study of· the factors limiting war
blers was conducted by the second approach. This
is slightly less accurate than the first method, but
permits studying more factors and requires less
time. There are actually four parts to the study .
First. it is shown that density dependent events
playa large role in controlling the populations of the species. Second, a discussion of the' general ecology of the species (food, feeding zones, feeding
behavior, territoriality, predators, and mortality)
is presented. The observations were made in the
summers of 1956 and 1957. Third, the habits of
the different species in different seasons are compared to see what aspects of the general ecology
are invariant and hence characteristic of the
species. Some observations on the species' morphology are discussed in the light of these characteristics. This was the project of the fall and
winter of 1956 and the spring of 1957. Finally,
a wood-to-wood comparison of species abundances,
relative to the important constituents of their
niches as determined in the earlier stages, is presented. This work was done in the summers of 1956 and 1957