Author
|
Okuda T; Gomi T; Hodek I
|
’˜ŽÒ
|
‰œ“c@—²EŒÜ–¡³ŽuEHodek I
|
Title
|
Effect of temperature on pupal pigmentation and size of the elytral
spots in Coccinella septempunctata (Coleoptera: Coccinellidae) from four
latitudes in Japan
|
ƒ^ƒCƒgƒ‹
|
ƒiƒiƒzƒVƒeƒ“ƒgƒE‚̬’ŽãÀâ‚Ì•F”Á–äƒTƒCƒY‚¨‚æ‚Ñ匑ÌF‚É‹y‚Ú‚·‰·“x‚̉e‹¿FˆÜ“x‚̈قȂéŒÂ‘ÌŒQŠÔ‚Ì”äŠr
|
Keywords
|
Coccinella septempunctata, elytral spot, pupal pigmentation, latitude,
temperature
|
Abstract
|
Coccinella septempunctata populations collected from different
latitudes in Japan were reared for the first time at three constant
temperatures and the size of the central elytral spot was measured. At 20
degrees C the elytral spot size increased with latitude. It was
significantly greater in the Sapporo population, 43 degrees N, than in the
Tsukuba and Kagoshima populations, which are at latitudes 36 and 32
degrees N, respectively, and smallest in the Iriomote population at
latitude 24 degrees N. In all populations the elytral spot increased in
size when reared at lower temperature. This tendency was Very strong in
the Sapporo population. The pigmentation of pupae increased with decrease
in temperature, thus they were mostly orange at 30 degrees C and dark
brown at 20 degrees C. In agreement with previous reports by DOBZHANSKY
and SASAJI, it is assumed that all three populations from the main
Japanese islands belong to C. septempunctata brucki. In the Iriomote
population, the spot was small and Little affected by rearing temperature;
this suggests that this population may belong to the subspecies C.
septempunctata septempunctata. The contrast between earlier and later
reports on the occurrence of the two subspecies in the Ryukyu Islands is
discussed in relation to the dense ship transport from the main Japanese
Islands after 1972.
|
—vŽ|
|
|
Journal
|
Appl.Ent.Zool., 32(4), 1997, p.567-572.
|