Butterfly migration field data Georgia 1987

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Table III i - Page 20
Airport in Calhoun, Georgia; September 30, 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.
Flt.

Vert.
Flt.

Mag.
Bear.

Mag.
Head.

Wind
Dir.

Wind
Vel.

Amb.
Temp

Thrm.
Act.

Cloud
Types

113

D. plexippus

11:46

15 m

soar,
glide,
flap

circle,
variable,
straight

level,
descend,
level

011°

5.6 m/s

yes

Butterfly started at 15 m, soared in circles without gaining altitude, then glided down and began flapping.

114

D. plexippus

11:47

60 m

soar

straight,
variable

level

197°

yes

Seven D. plexippus and a dragonfly were also seen.

115

D. plexippus

11:50

160 m

soar

straight,
variable

level

243°

right

005°

2.0 m/s

yes

A J. coenia and an Anax junius were seen. The dragonfly had a South bearing. Visit the North American Dragonfly Migration Project for more information about A. junius.

116

J. coenia

11:53

60 m

soar,
(flap)

circle,
erratic

level

196°

014°

3.6 m/s

yes

Another D. plexippus was seen. Vultures and swifts were foraging.

117

D. plexippus

11:56

200 m

soar

circle

level

185°

008°

5.6 m/s

yes

A second D. plexippus and a J. coenia were seen.

118

D. plexippus

12:00

10 m

soar,
flap

straight,
circle

climb

174°

280°

360°

3.6 m/s

21.5°C

yes

cumulus
in streets

Butterfly climbed steadily, using a mix of soaring straight, soaring in circles, and flapping.

Break

12:01

During the break, some D. plexippus were seen foraging and others were seen settling out (descending).