Sex pheromone components of pyralid moths
Terastia subjectalis and
Agathodes ostentalis feeding
on the coral tree, Erithrina variegata: Two
sympatric species share common components in different ratios |
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Authors: | S Wakamura N Arakaki |
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Institution: | (1) Laboratory of Insect Behavior, National Institute of Agrobiological Sciences (NIAS), Ohwashi 1-2, Tsukuba, 305-8634, Japan;(2) Okinawa Prefectural Agricultural Experiment Station (OPAES), 4-222 Sakiyama, Okinawa, 903-0814, Japan |
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Abstract: | Summary. Two common components, identified as
(E)-11-hexadecenal (E11-16:Ald) and (E,E)-10,12-hexadecadienal
(E10E12-16:Ald), were found in the extract of virgin females of two sympatric pyralid moths, Terastia subjectalis
Lederer, and Agathodes ostentalis (Geyer). The amount of E11-16:Ald and E10E12-16:Ald was 0.12 and 2.8 ng/female
for T. subjectalis and 2.0 and 1.8 ng/female for A. ostentalis,
respectively. Hexadecanal (16:Ald) was also found at
0.7 ng/female in the extract of A. ostentalis, but EAG activity was unclear. In the field, T. subjectalis and
A. ostentalis
males were captured with species specific blends in the proportions
of 5:95 and 50:50 blends. Blends attractive to one
species did not attract the opposite one. Rubber septa loaded
with 1 mg each of 5:95 and 50:50 blends of E11-16:Ald and
E10E12-16:Ald were as attractive as two virgin females of
T. subjectalis and
A. ostentalis
, respectively. This demonstrated
that different ratios of shared pheromone components could
provide species specific cues for critical mate location in the
two sympatric pyralid moths. It is suggested that directional
selection probably occurs in the pheromone blends in opposite
directions in both species. |
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Keywords: | Sex pheromone pyralid moths sibling species directional selection |
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