The use of behavioral mutants in biological control
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Abstract
Flies of the genusDrosophila fall into three classes with respect to the effect of light on their mating behavior. Class I species mate freely in both light and darkness, while class II species are inhibited in darkness. Class III represents those species with an absolute requirement for light, which will not mate in darkness. The breadth of geographic distribution and the extent of light dependency are correlated; endemic species have the greatest light dependency and cosmopolitan species demonstrate the least dependency. Class II species are intermediate in both respects. These classes of light dependency reflect the degree to which the courtship behavior of the various species is locked in on unique visual stimuli. Species which mate freely in darkness can use sensory modalities other than vision in their courtship. This indicates the relative flexibility of the underlying genetic architecture subserving mating behavior and suggests that widely distributed species possess greater behavioral plasticity than specialized forms. The existence of genetic control elements as well as morphological and neurological mutants provides several modes by which the reproductive activities of species uniquely dependent on visual stimuli can be interrupted. Some insects in orders other than Diptera also rely on visual stimuli for reproductive activities. There are several points in the course of a mating sequence where such stimuli can be used: (1) as a trigger for activity, (2) as a signal to initiate courtship, and (3) as a releaser of a specific motor pattern during courtship itself. The use of mutants affecting behavior is potentially feasible for biological control of insects relying on information received via other sensory systems as well. The basic requirements for the practical use of behavioral mutants are (1) species uniquely dependent on a particular sensory input, (2) a means of generating mutants which interfere with this path of information flow and (3) techniques for delivering and/or maintaining behavioral mutants in populations. Rearing and release of behavioral mutants could be an effective means of reducing fertility of pest populations by rendering translocationhomozygotes sterile in an overall program using the semisterility of translocation heterozygotes to effect population control. Alternately, behavioral mutants could be used at the point in a program where further reduction of population density with multiple heterozygous translocations alone was not practicable.
Keywords
Biological Control Visual Stimulus Sensory Modality Mating Behavior Genetic ArchitecturePreview
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