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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2013年50 No.6

Impacts of periodic repeated heat events on ecological performance in insects
Author of the article:WANG LinMA ChunSen
Author's Workplace:State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing100193, China
Key Words:periodically repeated temperatures, high temperature pattern, life history traits, insects
Abstract:     In natural environments, insects experience periodic repeated high temperatures on timescales of several days. Climate warming is predicted to increase the intensity, duration and frequency of extreme heatwaves and hot days. The implications are that studies of the impacts of periodic repeated high temperatures on insects over a timescale of days will become more feasible. Three broad groups of studies of the effects of periodically repeated high temperatures on insects have been employed: 1) comparisons between suitable constant temperatures and periodically repeated high temperatures; 2) investigations of the effects of different periodically repeated high temperatures occurring at different development stages; 3) investigations of the effects of different periodically repeated high temperatures occurring throughout the life of insects. Compared with suitable constant temperatures, repeated high temperature periods decrease insects‘ fecundity and increase insects’ longevity. Insects have different survival rates in different development stages in response to repeated hot periods. Fecundity is more greatly reduced when exposed to repeated hot conditions during mature stages than when exposed during the immature stages. Increasing the number of continued hot days decreases survival and fecundity. Exposure to a certain number of hot days can, however, increase insects’ longevity. Increasing the temperature and extending the duration of exposure to high temperature both decrease insects’ survival, fecundity and longevity. The frequencies of periods of repeated hot days have impacts on insect populations and spatial distribution, but these are different in different species. Periodically repeated high temperatures increase insects’ levels of Hsp70 expression, and insects’ fatty acid composition differs significantly between those in constant temperatures and those subjected to periodically repeated high temperatures. However, there is a lack of studies on the impacts of periodically repeated high temperatures on insects’ metabolism. We point out future research directions, including simulating natural temperature variations, and making the research more practical, investigating more lifehistory traits and elucidating the mechanistic links among these traits, and investigating more species of important insects.
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