title: Direct Effects of Elevated CO2 Levels on the Fitness Performance of Asian Corn Borer (Lepidoptera: Crambidae) for Multigenerations.
abstract: Understanding direct response of insects to elevated CO2 should help to elucidate the mechanistic bases of the effects of elevated CO2 on interactions of insects with plants. This should improve our ability to predict shifts in insect population dynamics and community interactions under the conditions of climate change. Effects of elevated CO2 levels on the fitness-related parameters were examined for multigenerations in the Asian corn borer, Ostrinia furnacalis (Guenée). The larvae were allowed to feed on artificial diet, and reared in the closed-dynamic environment chambers with three CO2 levels (ambient, 550 μl/liter, and 750 μl/liter) for six generations. In comparison with the ambient CO2 level, mean larval survival rate decreased 9.9% in 750 μl/liter CO2 level, across O. furnacalis generations, and larval and pupal development times increased 7.5-16.4% and 4.5-13.4%, respectively, in two elevated CO2 levels. Pupal weight was reduced more than 12.2% in 750 μl/liter CO2 level. Across O. furnacalis generations, mean food consumption per larva increased 2.7, 7.0% and frass excretion per larva increased 14.4, 22.5% in the two elevated CO2 levels, respectively, compared with ambient CO2 level. Elevated CO2 levels resulted in the decline mean across O. furnacalis generations in mean relative growth rate, but increased in relative consumption rate. These results suggested that elevated CO2 would reduce the fitness-related parameters such as higher mortality, lower pupal weight, and longer development times in long term. It also reduced the larval food digestibility and utilizing efficiency; in turn, this would result in increase of food consumption.
authors: The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P. R. China. klhe@ippcaas.cn.
authors: Haicui
authors: H
authors: Xie
authors: The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P. R. China. College of Agronomy, Sichuan Agricultural University, Chengdu 611130, P. R. China.
authors: Lei
authors: L
authors: Zhao
authors: College of Agronomy, Sichuan Agricultural University, Chengdu 611130, P. R. China.
authors: Qunfang
authors: Q
authors: Yang
authors: The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P. R. China.
authors: Zhenying
authors: Z
authors: Wang
authors: The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P. R. China. klhe@ippcaas.cn.
authors: Kanglai
authors: K
authors: He
mesh_terms: D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002245:Carbon Dioxide / Q000378:metabolism*; D004032:Diet; D004063:Digestion; D060434:Herbivory; D007814:Larva / Q000254:growth & development / Q000502:physiology; D008136:Longevity; D009036:Moths / Q000254:growth & development / Q000502:physiology*; D011679:Pupa / Q000254:growth & development / Q000502:physiology
chemical_list: D002245:Carbon Dioxide
keywords: Ostrinnia furnacalis; consumption; elevated CO2; food digestibility; growth