• Behavioural analysis of feeding and breeding in Orthopteran insects

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    • Keywords


      Ethology; ethogram; trophic and reproductive behaviour; methodology; adaptive radiation

    • Abstract


      Various aspects of the feeding and breeding behaviours in Orthoptera with special reference to Acridoidea and Tetrigoidea are discussed. The changes in the incisor and molar mandibular surfaces, laciniae and galeae of the maxillae, in relation to graminivory, herbivory and omnivory are cited as specific manifestations of the feeding behaviour. Similarly, in sharp contrast to Acridoids the rather poor foregut armature and small and compact feculae in Tetrigoids is suggested as an evidence indicating the correlation between food and feeding habits. While describing the breeding behaviour a generalized comparison of the utilization of the acoustic sexual signals in crickets and grasshoppers causing attraction and copulation or otherwise is made. Differences in the ovipositors, mode of egg-laying and the types of eggs in Acridoids and Tetrigoids are stated as characteristic features of reproductive behaviour. Factors influencing these behaviours in Orthoptera as well as the behaviours bringing about succession and changes in the patterns of life-forms are mentioned.

      Tools of behavioural investigations leading to the formulation of ethograms are briefly stated. Methods and techniques generally adopted in studying these aspects of behaviours are referred to as application of such ethological studies. The causative effect of feeding and breeding behaviours is depicted by proposing the adaptive radiation diagrams for the order Orthoptera.

      The article, in conclusion, points out certain areas related to these behaviours on which, work would seemingly be useful. For example, determination of the cues that bring about mating in grouse-locusts in the absence of stridulatory and tympanal organs; the energy budget on account of their peculiar diet; and diapause are few such areas. The possibility of these forms turning out to be good models for experimental, lab-oriented studies is suggested. Since, as compared to Acridoids very little studies in the areas of economic and ecological impact in terms of population dynamics have been made on the Tettigonioids and Tetrigoids, it is further suggested that these if undertaken, would also furnish valuable information.

    • Author Affiliations


      S Y Paranjape1

      1. Department of Zoology, Modern College, Shivajinagar, Pune - 411005, India
    • Dates


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