• S Y Paranjape

      Articles written in Proceedings – Animal Sciences

    • Behavioural analysis of feeding and breeding in Orthopteran insects

      S Y Paranjape

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      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.

    • Some observations on the nutrition—reproduction correlation in grouse locusts (Orthoptera: Tetrigidae)

      A M Bhalerao N M Naidu S Y Paranjape

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      The correlation between nutrition and reproduction with reference to two grouse locusts,Euscelimena harpago (Tetrigidae: Scelimeniae) andPotua sabulosa (Tetrigidae: Cladonotinae) is assessed. As far asEuscelimena harpago is concerned the impact of nutrition on reproduction is presented with reference to ovarian development in certain nymphal stages and in the adult. On the other hand, the impact is evaluated from an altogether different angle as far asPotua sabulosa is concerned. This pigmy locust prefers moss as food and tides over winter and hazardous summer as adult. During this period it almost does not feed. This peculiar feature is used as a parameter to assess the nature of impact inP. sabulosa.

    • Significance of haemolymph protein patterns in biosystematic studies of some grouse locusts (Tetrigidae: Orthoptera)

      S Y Paranjape N M Naidu N N Godbole

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      The grouse locusts (Tetrigidae) represent a group of small sized Caeliferan Orthoptera. These are considered to be primitive orthopterans related to Tridactylids on one hand to Acridids on the other. This family is represented in Indian subcontinent by about 90 species belonging to 35 genera. In the present study haemolymph protein profiles from 7 species from this family have been studied as an additional parameter to understand interrelationship amongst them. It is noted that the speciesParatettix dorsifer andEuparatettix personatus belonging to the same subfamily Tetriginae show remarkable similarity in the haemolymph protein profile, thus justifying their classical taxonomical grouping. In case of subfamily Scelimeninae, however, of the 4 species studied 3 species vizEucriotettix flavopictus, Criotettix latifrons andThoradonta pruthii show a marked similarity, howeverEucriotettix harpago shows a pattern closer to that observed in the subfamily Cladonotinae. This implies that though by classical taxonomic criteria the 4 species are close to each other this may not be a very natural grouping.

      From this observation it becomes clear that help from additional parameters like protein profile studies, immunochemical studies, cytogenetic analysis, etc will prove to be very valuable for the real understanding of phylogenetic interrelations and evolution of this family in particular and the status of grouse locusts vis-a-vis the orthopteran insects in general.


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