Butterfly migration field data Georgia 1987

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Table X k - Page 79
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

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

372

D. plexippus

3:48

20 m

soar

circle

level,
climb

126

322°

5.4 m/s

yes

Butterfly started at 10 m and was circling and soaring. It encountered an area of stronger lift over trees, began to gain altitude and had climbed to 20 m by the time it vanished.

373

D. plexippus

3:52

25 m

flap

circle,
straight

climb

138°

right

Butterfly flapped upward, making several large circles, before straightening out.

374

D. plexippus

3:53

25 m

soar

circle,
straight

level

138°

right

328°

2.7 m/s

yes

Butterfly was soaring straight with only occasional circles. Another, higher, D. plexippus was also seen.

375

D. plexippus

3:58

30 m

soar,
flap,
soar

straight,
circle

level,
climb

185°

230°

347°

3.1 m/s

yes

Butterfly started by soaring straight and level, then switched to flapping, then it encountered a thermal, began to soar in circles, and gained altitude. Another, higher, D. plexippus was also seen.

376

D. plexippus

4:00

25 m

soar,
(flap)

straight

level

171°

347°

yes

Butterfly was soaring straight with occasional flaps.

377

D. plexippus

4:05

25 m

flap,
soar

straight,
circle

level,
climb

162°

338°

2.2 m/s

yes

Butterfly was flapping along 10 m, encountered a thermal, began soar in circles, and climbed to 25 m. A second D. plexippus flew by off to one side. A sharp-shinned hawk flew over.