登入選單

返回Google圖書搜尋

Cellular and Molecular Mechanisms of Environmental Stress Tolerance in Insects

Nicholas Mario Teets

出版	Ohio State University, 2012
URL	http://books.google.com.hk/books?id=YetvmwEACAAJ&hl=&source=gbs_api

註釋

In the latter 4 chapters of this dissertation, I investigated physiological and molecular mechanisms of stress tolerance in the Antarctic midge, Belgica antarctica, the world's southernmost insect and the only insect endemic to the continent. In the unpredictable climate of Antarctica, larvae are likely exposed to multiple bouts of both cold and desiccation stress, thus I quantified the survival and energetic consequences of repeated cold and dehydration exposure in B. antarctica. Larvae exposed to five diurnal freeze-thaw cycles experienced significant mortality and energy depletion. However, this was only true if larvae were frozen during repeated cold exposure; supercooled larvae exposed to the same temperatures experienced no significant mortality or energy depletion. Repeated bouts of dehydration and rehydration were also energetically costly, as 5 cycles of dehydration and rehydration caused larvae to consume 67% of their carbohydrate energy reserves.