36 
James E. Joy and Jeffrey W. Hively 
Fig. 1A. Back-transformed 
mean number of female mites, 
i.e. antilog [log Y]. Horizontal 
lines and closed circles indicate 
mean numbers of U. formosa 
females in host mussels from 
Ponds 14 and 27, respectively. 
Vertical lines are 95% con- 
fidence limits around the 
means. Numbers above vertical 
lines equal host sample size. 
Because prevalence was 100%, 
number of infested mussels is 
the same as sample size. 
Fig. IB. Back-transformed 
mean number of male mites, 
i.e. antilog [log Y+l]. Horizon- 
tal lines indicate mean numbers 
of U. formosa males in host 
mussels from Pond 14. Vertical 
lines are 95% confidence limits 
around the means. Fractions 
above vertical lines denote prev- 
alence, with denominator the 
host sample size and numerator 
the number of hosts infested. 
Fig. 1C. Back-transformed 
mean number of male mites, 
i.e. antilog [log Y+l]. Closed 
circles indicate mean numbers 
of U. formosa males in host 
mussels from Pond 27. Vertical 
lines are 95% confidence limits 
around the means. Fractions 
above vertical lines denote prev- 
alence as in Fig. IB. 
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