Butterfly migration field data Georgia 1987

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Table XII d - Page 93
Airport in Calhoun, Georgia; October 9, 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

414

D. plexippus

12:15

3 m

flap

straight

climb

251°

left

162°

2.9 m/s

Butterfly started at 2 m, and climbed as it approached row of trees. A P. sennae was also seen.

415

V. atalanta

12:20

1 m

flap

straight

level

241°

left

197°

2.9 m/s

416

D. plexippus

12:28

0.3 m

flap

straight

level

268°

210°

138°

3.6 m/s

417

P. sennae

12:45

flap

straight

level

058°

right

164°

2.2 m/s

I missed recording the altitude.

418

D. plexippus

12:48

1 m

flap

straight

level

280°

left

172°

1.3 m/s

A second D. plexippus was seen flying in the same direction.

12:51

21.5°C

Two A. vanillae were also seen.

419

D. plexippus

1:01

45 m

flap,
soar,
glide

straight,
circle,
straight

climb,
descend

295°

167°

2.5 m/s

yes

Butterfly started at 25 m and was flapping upward. It encountered a thermal and circled and soared to 45 m, then left the thermal and glided down to tree at 15 m.

420

D. plexippus

1:04

0.5 m

flap

straight

level

142°

right

165°

0.5 m/s

yes

The released balloon went straight up, indicating that a thermal was approaching.

421

D. plexippus

1:15

60 m

glider,
soar

straight,
circle

descend
climb

265°

89°

1.6 m/s

yes

Butterfly was gliding down when it encountered the thermal and began circling and soaring and climbed to 60 m before vanishing. The thermal had arrived at the field.