• A Raman

      Articles written in Proceedings – Animal Sciences

    • On the developmental morphology of the rosette galls ofAcacia leucophloea Willd., (Mimosaceae) induced byThilakothrips hablu Ramk. (Thysanoptera: Insecta)

      A Raman T N Ananthakrishnan

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      Thilakothrips babuli induces rosette (artichoke) galls on the axillary buds ofAcacia leucophloea. As a result of feeding by the building populations of thrips, axillary shoot meristems are destroyed, and primordial palisade tissues of the leaflets and cortical tissues of the shoot axis are transformed into nutritive cells of specialised morphology. Very similar to the galls induced by mites, midges, chalcids, and chloropids,Thilakothrips-inducedAcacia galls also have a characteristic morphology, involving the inhibition of elongation of the shoot axis and crowding of maldeveloped leaflets. While describing the cecidogenesis in relation to the biology of the gall maker, an attempt has been made to discuss the morphological convergence among shoot apex galls.

    • Gall insect-host plant relationships—An ecological perspective

      A Raman

      More Details Abstract Fulltext PDF

      Compared to other phytophagous insects, the gall insects are specialised in view of their imperative demand for a particular type of food in terms of a specific host; this is further supported by their specialised trends in establishing a coordinated, functionally efficient system involving (i) the biogenesis of the host plant organ, and (ii) the life-cycle of the gall-maker. The ’inherent potential’ (genetic-?) of the gall-insect to establish an independent, yet a discrete habitat, modifying the host plant tissue to enjoy a self-contained nutritional guild, facilitated by the host selection patterns, appears especially different from the other non-cecidogenous phytophages.

      Besides the autecological factors such as the changing climate, chemical and physical changes in the host tissue, and patchyness of food plant resources, which are of great importance to the cecidogens, of particular significance are the community interactions within gall systems involving many arthropod participants like inquilines, parasites, predators, and other casual visitors. As specialised organisms and with limited population size per unit area, the gall insects seem to run the risk of random extinction, although their efficient development of strategies to survive appears significant.

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