Figure 1. Plot design: treatments were 5 m apart on a row and
each row was separated by 10 m. Each plot consisted
of six treatments in an unbalanced design. The +
indicates perch sites that were weeded (6 replicates /
plot), + perch sites not weeded (3 replicates), ⊕
perches with seed traps (3 replicates), • control points
(no perches) that were weeded (6 replicates), • control
sites not weeded (3 replicates), and $ control points
with seed traps (3 replicates).