800 
THE WILSON JOURNAL OF ORNITHOLOGY • Vol 124. No. 4. December 2012 
(A) 
120 
100 
-89,9- 
90 89 9 
93.3 
Q1 *) 
B- 
■■ 
-xLz 
SO 
1-Bl- 
* 
60 
40 
20 
-5,2-5 - q.8_ 
118 
0 
•- 
----- 
- — 
-•-- 
-8:2- | 
13 Jun Arrival 
(n=142) 
28Jur Egg 1 Jul Incubation 26 Jj| Hatching 
laying (n=142) onset (n=140l ln=142) 
-^-Temperature “C -*-Humidity% 
13 Sep Fledging 
(n=142) 
( B) 
(Fig. -A). We collected a substantial amour 
ata at Fulton Resurgence Cave in Coloi 
whose subterranean nature provides a st; 
climate. Temperatures averaged 4 °C lower 
RH averaged 6% higher within .he e 
O da? r f, br f edin s season when comp, 
to dam from ail other Colorado and New Me, 
Season-long, 15 May ,o4 Sep) median 4 
wSe ,3 4™ , » col, 
were 13.4 ± 2.89 C (range = 81-198 C „ 
.355) g ± ,5,4-angeT^ 8 ,^ 
n F-155), respectively (Fig. 2B). 
Temperature and RH readings remained stable 
within each 24-hr period at Colorado and New 
Mexico sites. Temperature varied from a median 
daily high of 11.1 C to a median dailv low of 10.1 C. 
a difference of I C. RH varied from a median daily 
high of 87.9% to a median daily low of 82.5%. a 
difference of 5.4%. Similar data from the Califor¬ 
nia site were not available due to the times of day 
for which data loggers were set to collect data. 
DISCUSSION 
Data loggers are a reliable method of obtaining 
temperature and RH at Black Swift colonies. 
