• Significance of critical developmental stage on starvation induced endocrine mediated precocious metamorphosis inOryctes rhinoceros (Coleoptera: Scarabaeidae)

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    • Keywords


      Coconut rhinoceros beetle; Oryctes rhinoceros ; starvation; precocious metamorphosis; critical developmental stage

    • Abstract


      Final (3rd) instar larvae of the coconut rhinoceros beetleOryctes rhinoceros were found to undergo precocious metamorphosis when subjected to starvation; the beetles produced as a result were subnormal in size. However, the larva showed this kind of response to starvation only after attaining a certain critical stage of development; otherwise they died after surviving for a varying period, depending on their age. Topical application of the juvenile hormone analogue ‘Kinoprene’ (ZR 777) in sufficient doses at definite periods caused significant delay in the onset of precocious metamorphosis thus suggesting an endocrine involvement. Evidently, starvation might have caused a decrease in JH-titre which in its turn, triggered a chain of events leading to precocious metamorphosis.

    • Author Affiliations


      A Mini1 V K K Prabhu1

      1. Department of Zoology, University of Kerala, Kariavattom, Trivandrum - 695 581, India
    • Dates


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