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Author (up) Appleby, J.H.; Credland, P.F. url  doi
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  Title The role of temperature and larval crowding in morph determination in a tropical beetle, Callosobruchus subinnotatus Type Journal Article
  Year 2007 Publication Journal of Insect Physiology Abbreviated Journal J Insect Physiol  
  Volume 53 Issue 10 Pages 983-993  
  Keywords Animals; Beetles/*growth & development; Crowding; Fabaceae/parasitology; Female; Larva/growth & development; Male; Morphogenesis/*physiology; Temperature; Tropical Climate  
  Abstract Many insect species can produce individuals of more than one form or morph. Different morphs of the same species may differ in their physiology, morphology and in behaviour. Understanding the factors and mechanisms involved in determining the production of different morphs of insect species is of major importance in understanding the evolution of specific life-history strategies. In this paper, we studied the importance of temperature as an environmental factor involved in morph determination of the tropical beetle, Callosobruchus subinnotatus. Adults occur as relatively sedentary, highly fecund, 'normal' morphs or as an 'active' morph adapted to dispersal. Larval crowding, seed density and external temperature were independently manipulated in a series of controlled experiments and the proportions of 'active' and 'normal' adult morphs among the emergent adult populations were quantified and compared. Development in crowded conditions was found to be associated with the production of a significantly higher proportion of 'active' adults than development in isolation, and was also responsible for a predictable rise in the localised temperature of infested heaps of seeds of between 4 and 8 degrees C above ambient (27 degrees C). This rise in temperature is subsequently shown to be directly and quantitatively associated with the proportion of 'active' adults among emerging adults, both in the presence of larval crowding and independently from it. Thus, it is suggested that in the crowded environment representative of an infested seed store, it is rising temperature, occurring at a specific point in insect development which is the proximate cue for 'active' morph induction in C. subinnotatus. The results are compared to the strategies used by other polymorphic insects to survive in heterogeneous environments.  
  Address School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey, UK  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0022-1910 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:17585931 Approved no  
  Call Number GGC @ mschluet @ Serial 26  
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