Butterfly migration field data Georgia 1987

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Table I b - Page 2
Airport in Calhoun, Georgia; September 28, 1987;
(Magnetic Declination = 2°W: Subtract 2° for True Bearing, True Heading and True Wind Direction)

Num.

Species

Time

Flight Behavior

Weather

Field Notes

III

Part 1

Part 2

Part 3

Est.
Alt.

Type
of Flt.

Horiz.
Path

Vert.
Path

Mag.
Bear.

Mag.
Head.

Wind
Dir.

Wind
Vel.

Amb.
Temp.

Thrm.
Act.

Cloud
Types

D. plexippus

200 m

soar

circle

climb

290°

162°

3.1 m/s

yes

cumulus

D. plexippus

9:57

12 m

flap,
soar,
glide,

straight,
circle

climb,
descend

270°

218°

156°

2.5 m/s

yes

cumulus

Butterfly started at 10 m, flapped up to a thermal, circled and soared, then glided back down and resumed flapping.

Junonia
coenia

10:02

flap

yes

20%
cumulus

Butterfly landed - was probably foraging. More sharp-shinned hawks were soaring.

D. plexippus

10:04

100 m

soar

straight

level

274°

left

152°

4.0 m/s

25.0°C

yes

Swifts were foraging.

D. plexippus

10:09

30 m

soar

straight,
(circle)

climb

269°

left

131°

2.1 m/s

25.0°C

yes

Butterfly gained altitude rapidly while soaring straight. Two more D. plexippus and a large dragonfly were also seen.

D. plexippus

10:13

2 m

flap

straight

level

274°

left

138°

3.6 m/s

yes

increasing
cumulus

A 2'nd D. plexippus was seen. Swifts, sharp-shinned hawks and vultures were soaring.

D. plexippus

20 m

soar

straight

level

267°

left

140°

2.0 m/s

yes

D. plexippus

1 m

flap

straight

level

267°

left

155°

2.2 m/s

yes

Swallows were foraging at high altitudes.

D. plexippus

10:23

100 m

soar,
glide

circle,
straight

climb,
level,
descend

267°

(left)

099°

2.0 m/s

yes

70%
cumulus

Butterfly started at 30 m, circled up to 100 m, then left the thermal and began to glide back down. A second D. plexippus was seen.