کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2841446 1165398 2007 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The role of temperature and larval crowding in morph determination in a tropical beetle, Callosobruchus subinnotatus
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش حشره شناسی
پیش نمایش صفحه اول مقاله
The role of temperature and larval crowding in morph determination in a tropical beetle, Callosobruchus subinnotatus
چکیده انگلیسی

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 °C above ambient (27 °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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Insect Physiology - Volume 53, Issue 10, October 2007, Pages 983–993
نویسندگان
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