摘要:

ABSTRACT.A technique is described for averaging the electrophysiological responses of single olfactory sensilla when repeatedly stimulated with the same odour. This enables measurements of electrophysiological responses to be interpreted in a way not normally possible because of the highly variable nature of the individual responses of sensory cells. When the antennal receptors of males ofEpiphyas postvittanaare stimulated with a single pheromone component, it is shown that the responses contain sufficient information to detect readily both the onset and removal of a stimulus and also a doubling or halving in the concentration of the pheromone. Significant changes in the spontaneous activity of cells following stimulation are also described.

ISSN:0307-6962    

DOI:10.1111/j.1365-3032.1981.tb00263.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

ABSTRACT.Insect photoperiodic responses are complex and variable, but all involve a ‘clock’ which is used to determine the qualitative difference between long and short nights, and a ‘counter’ mechanism which accumulates successive long (or short) nightsquantitativelyup to an internal threshold at which induction (of diapause, seasonal morphs, etc.) is ‘complete’. The clock is circadianbased in at least seven species; in others a non‐oscillatory ‘hour‐glass’ device is indicated, but negative ‘resonance’ experiments may not necessarily rule out a circadian involvement in time measurement. The counter is temperature‐compensated. In some species it adds up long nights, in some short nights, and in others longandshort nights. The proportion of the population entering diapause is dependent on an interaction between the temperature‐compensated counter and temperature‐dependent rates of development; this interaction explains many of the known effects of temperature, diet, and latitude in insect photoperiodic responses. In formal terms, the accumulation of long nights is seen as an increase in a ‘diapause titre’ which is compared with an individual internal threshold. In concrete terms, this ‘titre’, and the counter mechanism, might be represented by the accumulation of neurosecretory granu

ISSN:0307-6962    

DOI:10.1111/j.1365-3032.1981.tb00264.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

Book reviewed in this article:INTRODUCTION TO INSECT BEHAVIOR. By Michael D. AtkinsNEUROETHOLOGY — AN INTRODUCTION. By D. M. Guthr

ISSN:0307-6962    

DOI:10.1111/j.1365-3032.1981.tb00265.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

BRITISH BEE BOOKS: A BIBLIOGRAPHY 1500–1976. By International Bee Research AssociationENTOMOLOGY. By Cedric GillottTHE LOCUST — A LABORATORY GUIDE. 2nd edition. By Robert Bar

ISSN:0307-6962    

DOI:10.1111/j.1365-3032.1981.tb00266.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY