Manoeuvres used by flying male oriental fruit moths to relocate a sex pheromone plume in an experimentally shifted wind‐field

T. C. BAKER, K. F. HAYNES

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

ABSTRACT. In a wind‐field experimentally shifted in direction by 35d̀, flying male Grapholita molesta (Busck) zigzagging upwind either maintained contact with a pheromone plume and followed it across during the shift or lost it and commenced casting at c. 90d̀ across the shifting windline to locate it eventually in its new position. Males accomplished both of these results by integrating the previously described systems of optomotor anemotaxis and self‐steered counterturning, but with faster reaction‐times to pheromone on and off than heretofore calculated for this species. We found no evidence that males following the plume across used chemotaxis as proposed for another species, Rather, the sawtoothed‐shaped tracks were a result of the anemotactic and counterturning systems responding rapidly and reiteratively to each loss and gain of pheromone along the plume in the shifting wind. The response to an increase or decrease in pheromone concentration by males was to change their course angle to more upwind or more crosswind, respectively, on the very first reversal (within c. 0.15 s) after the concentration changed. Because males adjusted their airspeeds more slowly to changes in concentration, the groundspeeds along the more upwind‐orientated legs were lower than those along cross‐wind legs, contributing to the sawtoothed shape of tracks of plume‐followers. The self‐steered counterturning programme also reacted quickly to concentration changes, the reversal intervals tending to be shorter following each contact with pheromone than after each excursion into cleaner wind. Following casting after losing the plume, males relocating the pheromone plume exhibited an upwind ‘surge’ of narrow zigzagging flight because on the first leg in the plume they steered a course more directly upwind than on the previous leg and increased the frequency of counterturning to its highest value while maintaining the relatively high airspeed acquired while casting.

Original languageEnglish (US)
Pages (from-to)263-279
Number of pages17
JournalPhysiological Entomology
Volume12
Issue number3
DOIs
StatePublished - Sep 1987

Fingerprint

Grapholita molesta
Sex Attractants
Moths
sex pheromone
Pheromones
sex pheromones
pheromone
moth
pheromones
Fruit
flight
fruit
plume
Leg
legs
chemotaxis
cleaners
Chemotaxis

All Science Journal Classification (ASJC) codes

  • Physiology
  • Ecology, Evolution, Behavior and Systematics
  • Insect Science

Cite this

@article{60ea305ae47d4d4f875d771f8365d397,
title = "Manoeuvres used by flying male oriental fruit moths to relocate a sex pheromone plume in an experimentally shifted wind‐field",
abstract = "ABSTRACT. In a wind‐field experimentally shifted in direction by 35d̀, flying male Grapholita molesta (Busck) zigzagging upwind either maintained contact with a pheromone plume and followed it across during the shift or lost it and commenced casting at c. 90d̀ across the shifting windline to locate it eventually in its new position. Males accomplished both of these results by integrating the previously described systems of optomotor anemotaxis and self‐steered counterturning, but with faster reaction‐times to pheromone on and off than heretofore calculated for this species. We found no evidence that males following the plume across used chemotaxis as proposed for another species, Rather, the sawtoothed‐shaped tracks were a result of the anemotactic and counterturning systems responding rapidly and reiteratively to each loss and gain of pheromone along the plume in the shifting wind. The response to an increase or decrease in pheromone concentration by males was to change their course angle to more upwind or more crosswind, respectively, on the very first reversal (within c. 0.15 s) after the concentration changed. Because males adjusted their airspeeds more slowly to changes in concentration, the groundspeeds along the more upwind‐orientated legs were lower than those along cross‐wind legs, contributing to the sawtoothed shape of tracks of plume‐followers. The self‐steered counterturning programme also reacted quickly to concentration changes, the reversal intervals tending to be shorter following each contact with pheromone than after each excursion into cleaner wind. Following casting after losing the plume, males relocating the pheromone plume exhibited an upwind ‘surge’ of narrow zigzagging flight because on the first leg in the plume they steered a course more directly upwind than on the previous leg and increased the frequency of counterturning to its highest value while maintaining the relatively high airspeed acquired while casting.",
author = "BAKER, {T. C.} and HAYNES, {K. F.}",
year = "1987",
month = "9",
doi = "10.1111/j.1365-3032.1987.tb00751.x",
language = "English (US)",
volume = "12",
pages = "263--279",
journal = "Physiological Entomology",
issn = "0307-6962",
publisher = "Wiley-Blackwell",
number = "3",

}

Manoeuvres used by flying male oriental fruit moths to relocate a sex pheromone plume in an experimentally shifted wind‐field. / BAKER, T. C.; HAYNES, K. F.

In: Physiological Entomology, Vol. 12, No. 3, 09.1987, p. 263-279.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Manoeuvres used by flying male oriental fruit moths to relocate a sex pheromone plume in an experimentally shifted wind‐field

AU - BAKER, T. C.

AU - HAYNES, K. F.

PY - 1987/9

Y1 - 1987/9

N2 - ABSTRACT. In a wind‐field experimentally shifted in direction by 35d̀, flying male Grapholita molesta (Busck) zigzagging upwind either maintained contact with a pheromone plume and followed it across during the shift or lost it and commenced casting at c. 90d̀ across the shifting windline to locate it eventually in its new position. Males accomplished both of these results by integrating the previously described systems of optomotor anemotaxis and self‐steered counterturning, but with faster reaction‐times to pheromone on and off than heretofore calculated for this species. We found no evidence that males following the plume across used chemotaxis as proposed for another species, Rather, the sawtoothed‐shaped tracks were a result of the anemotactic and counterturning systems responding rapidly and reiteratively to each loss and gain of pheromone along the plume in the shifting wind. The response to an increase or decrease in pheromone concentration by males was to change their course angle to more upwind or more crosswind, respectively, on the very first reversal (within c. 0.15 s) after the concentration changed. Because males adjusted their airspeeds more slowly to changes in concentration, the groundspeeds along the more upwind‐orientated legs were lower than those along cross‐wind legs, contributing to the sawtoothed shape of tracks of plume‐followers. The self‐steered counterturning programme also reacted quickly to concentration changes, the reversal intervals tending to be shorter following each contact with pheromone than after each excursion into cleaner wind. Following casting after losing the plume, males relocating the pheromone plume exhibited an upwind ‘surge’ of narrow zigzagging flight because on the first leg in the plume they steered a course more directly upwind than on the previous leg and increased the frequency of counterturning to its highest value while maintaining the relatively high airspeed acquired while casting.

AB - ABSTRACT. In a wind‐field experimentally shifted in direction by 35d̀, flying male Grapholita molesta (Busck) zigzagging upwind either maintained contact with a pheromone plume and followed it across during the shift or lost it and commenced casting at c. 90d̀ across the shifting windline to locate it eventually in its new position. Males accomplished both of these results by integrating the previously described systems of optomotor anemotaxis and self‐steered counterturning, but with faster reaction‐times to pheromone on and off than heretofore calculated for this species. We found no evidence that males following the plume across used chemotaxis as proposed for another species, Rather, the sawtoothed‐shaped tracks were a result of the anemotactic and counterturning systems responding rapidly and reiteratively to each loss and gain of pheromone along the plume in the shifting wind. The response to an increase or decrease in pheromone concentration by males was to change their course angle to more upwind or more crosswind, respectively, on the very first reversal (within c. 0.15 s) after the concentration changed. Because males adjusted their airspeeds more slowly to changes in concentration, the groundspeeds along the more upwind‐orientated legs were lower than those along cross‐wind legs, contributing to the sawtoothed shape of tracks of plume‐followers. The self‐steered counterturning programme also reacted quickly to concentration changes, the reversal intervals tending to be shorter following each contact with pheromone than after each excursion into cleaner wind. Following casting after losing the plume, males relocating the pheromone plume exhibited an upwind ‘surge’ of narrow zigzagging flight because on the first leg in the plume they steered a course more directly upwind than on the previous leg and increased the frequency of counterturning to its highest value while maintaining the relatively high airspeed acquired while casting.

UR - http://www.scopus.com/inward/record.url?scp=0004645915&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0004645915&partnerID=8YFLogxK

U2 - 10.1111/j.1365-3032.1987.tb00751.x

DO - 10.1111/j.1365-3032.1987.tb00751.x

M3 - Article

AN - SCOPUS:0004645915

VL - 12

SP - 263

EP - 279

JO - Physiological Entomology

JF - Physiological Entomology

SN - 0307-6962

IS - 3

ER -