Butterfly migration field data Georgia 1987

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Table XII i - Page 98
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

442

D. plexippus

3:46

25 m

soar

circle

level

yes

I lost sight of the butterfly.

443

D. plexippus

3:54

60 m

glide,
flap,
soar

straight,
circle,

descend,
level,
climb

265°

left

110°

1 m/s

yes

Butterfly was soaring and circling at 20 m. It glided down to 3 m and started flapping, then found a thermal and soared and flapped upward, switched to circlng and soaring and climbed to 60 m. WW: Radar showed that numbers (aloft) were decreasing rapidly. Swifts were foraging.

444

D. plexippus

glide

straight

descend,
land

23.0°C

yes

Butterfly glided down and landed in the grass.

445

D. plexippus

4:00

glide

straight

descend,
land

left

yes

Butterfly glided down and landed in the grass. It was too far away for me to take its bearings. Vultures were soaring at 60 m and swifts were foraging.

446

D. plexippus

4:10

45 m

soar

circle

climb

088

1.6 m/s

yes

I lost sight of it against the sun.

447

T. lacerata

4:19

3 m

flap

straight

level

WSW

178

095

2.0 m/s

yes

WW: Radar showed that most of the targets had settled.

4:24

Released an air sonde.

448

D. plexippus

4:32

7 m

flap,
soar,
flap

straight,
circle,
straight

climb,
level

248

215

115

1.5 m/s

yes

Butterfly flapped up to thermal at 7 m, soared in circles for a while, then let thermal and resumed flapping flight.