 Table X b - Page 70
Airport in Calhoun, Georgia; October 7, 1987;
(Magnetic Declination = 2°W: Subtract 2° for True Bearing, True
Heading and True Wind Direction) |
Num. |
Species |
Time |
Flight Behavior |
Weather |
Field Notes |
I |
II |
III |
IV |
Va |
Vb |
Part 1 |
Part 2 |
Part 3 |
Est.
Alt. |
Type
of Flt. |
Horiz.
Flt. |
Vert.
Flt. |
Mag.
Bear. |
Mag.
Head. |
Wind
Dir. |
Wind
Vel. |
Amb.
Temp |
Thrm.
Act. |
Cloud
Types |
330 |
D. plexippus |
9:09 |
15 m |
flap,
glide,
flap,
(soar) |
straight,
(circle) |
descend,
climb |
222° |
172° |
295° |
1.8 m/s |
- |
yes |
- |
Butterfly started at 10 m, descended to 7 m, then climbed to 15 m
and continued on. It quit flapping several times and briefly soared in circles.
Winds were light and variable as thermal puffs began to develop. All of the D.
plexippus that Alton Sparks was observing on floweres in adjacent fields began taking
wing. |
331 |
D. plexippus |
9:14 |
20 m |
flap,
soar |
straight,
circle |
climb |
206° |
206° |
- |
- |
- |
yes |
- |
Butterfly started at 10 m, flapped up to a thermal, and began
gaining altitude while soaring in circles. When the butterfly was out of range of my
binoculars, John Westbrook was able to track it with the theodolite for 2 more minutes.
He reported that the continued to butterfly soar in circles for awhile, then began
flapping, and descended. The vanishing bearing was 177°, indicating that after for
most of John's observation, the migrant was flying in a right crosswind. |
332 |
D. plexippus |
9:19 |
1 m |
flap,
glide |
straight |
climb,
descend |
182° |
- |
185° |
2.5 m/s |
14.5°C |
- |
- |
Butterfly was flying upwind and may have been foraging. |