18 
C. D. Camp, C. W. Condee, and D. G. Lovell 
Dates of oviposition were recorded, and egg masses were counted 
in the study sites and in additional breeding sites that were discovered 
subsequently. Sample egg masses were removed and preserved in 10% 
formalin. Eggs were counted in eight separate collected masses, and 
samples (at least 10 eggs per mass) were taken from six of these masses 
for determination of egg size. The diameters of both eggs and outer jelly 
envelopes were measured to the nearest 0. 1 mm using a vernier caliper. 
Egg masses at NTL, RC1, and RC2 were monitored daily until 
hatching was complete. Dates when hatching began and ended were 
recorded. Midday readings of water and air temperatures were taken at 
NTL and RC1. Maximum depth was determined daily at all three sites. 
Ten larvae were preserved at hatching in 10% formalin, measured for 
total length to the nearest 0.1 mm, and staged (after Gosner 1960) with 
the aid of a dissecting microscope. 
A series of tadpoles was collected at RC2 as larvae neared meta- 
morphosis (stages 39-41 of Gosner 1960), preserved in 10% formalin, 
and measured for total length to the nearest 0.1 mm. 
A partial drift fence (after Gibbons and Semlitsch 1982) was 
constructed along one side of RC2 in order to collect newly meta- 
morphosed individuals. Tadpoles were observed two or three times per 
week until some of them began developing hind legs, at which time daily 
monitoring of both the edge of the pool and the drift fence began. 
Monitoring continued until metamorphosis and dispersal from the pool 
were complete. Body lengths (snout-vent) of newly metamorphosed 
froglets were measured to the nearest 0.5 mm in the field using a ruler, 
and the animals were then released on the opposite side of the fence. 
RESULTS 
Eggs were first discovered at NTL on 12 February 1987, and newly 
laid clutches appeared on 13 February. Adult male wood frogs were 
collected at the site on 12 and 23 February. A total of nine egg masses 
was located at NTL. These were deposited as individual masses scattered 
throughout an area covering approximately 35 m 2 . Eggs were deposited 
in RC1 (22 masses) and RC2 (18 masses) from mid-February to 2 
March, with most oviposition events occuring from 20 to 24 February. 
Most egg masses in these ponds were deposited as communal aggregates. 
Limited breeding activities were observed in three small adjacent ponds, 
where 1, 2, and 10 individual egg masses were recovered. 
Midday water temperatures during periods of oviposition were 3- 
18° C (mean = 9.1) at NTL and 6-15° C (x = 8.9) at RCI. Air temperatures 
during this period were 1-23° C (x = 8.7) at NTL and 5-20° C (x = 9.5) at 
RCI. Maximum depth averaged 9 cm at NTL and 33 cm at RCI during 
this time. 
