Only 22 (CMC) or 18 (MCC) species were measured for head fluid
activity due to limitations of sample size (Fig. 2). When comparing
among orders, the relative levels of cellulolytic activity for head fluids
were slightly different to the relative activity level patterns observed
with gut fluids. Enzymatic activities in head fluids against CMC and
MCC were not significantly different among orders (F5,32=0.44,
P=0.815). Even though gut fluid activities in larval Synanthedon
scitula were relatively low (Fig. 1) the highest measured activities in
our study were from head fluids of this insect (Fig. 2), although this