Temperate insects enter the state of diapause, or suppressed metabolism and development, during winter to preserve internal energy resources and time spring development. Even though overwintering metabolism is suppressed, it is influenced by temperature. Thus, elevated winter temperature, such as what is projected to occur due to climate change, may influence metabolic reserves and/or diapause progression. To determine the potential effects of elevated winter temperature on insects I subjected overwintering Eurosta solidaginis larvae to elevated and diurnally fluctuating temperatures. The insects subjected to constant elevated temperature treatment during diapause pupated and eclosed sooner than those subjected to more natural temperature exposures and what has been historically observed in nature. Constant elevated temperatures also negatively impacted egg production. Altering the timing of development and reduced egg production could negatively impact survival and reproductive success. In contrast, animals subjected to diurnally fluctuating temperatures that have occurred over the past 100 years had developmental rates similar to those in nature and high levels of egg production. Thus, to accurately reflect the impacts of rising temperatures with climate change, studies should incorporate natural temperature fluctuations into the methodology.
|Commitee:||Fowler, Tom, Krajniak, Kevin|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 81/12(E), Masters Abstracts International|
|Keywords:||Simulated variable, Rising winter temperatures, Overwintering insects|
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