The respiratory metabolism of overwintering Gomphocerus sibiricus (Orthoptera: Acrididae) eggs
Author of the article:HE Li-Zhi1** LIU Yu-Ping1 YAN Meng-Yun1 LIU Qiong1 LI Zhan-Wu2 JI Rong1*** YE Xiao-Fang1***
Author's Workplace：1. College of Life Sciences, Xinjiang Normal University, International Center for the Collaborative Management of Cross-border Pest in Central Asia, Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology, Urumqi 830054, China; 2. Monitoring and Reporting Workstation to Prevention and Control of Grasshopper and Mouse of Hami District, Hami 839000, China
Key Words：O2 consumption rate, CO2 release rate, metabolic rate, respiratory quotient (RQ), Gomphocerus sibiricus egg
[Objectives] To investigate the respiratory physiology of overwintering eggs of G. sibiricus, an important indicator species in subalpine and forest grasslands in Xinjiang. [Methods] Respiratory rate, metabolic rate and respiratory quotient were measured with Sable Systems from August to April and embryonic development was observed, and temperature measured, monthly. [Results] The respiratory metabolism of locust eggs generally tended to increase during overwintering (pre-winter < winter < post-winter). There was no significance between eggs in different months in pre-winter (Aug.-Oct.) and winter (Nov.-Feb.) (P>0.05), but respiration and metabolic rate increased significantly post-winter (Mar.-Apr.) (P<0.05). The average pre-winter, winter, and post-winter, respiratory quotients of locust eggs were 0.66, 0.80 and 1.01, respectively. These values suggest that the main metabolic substrates during these three periods are fat, fat + carbohydrates, and carbohydrates, respectively. Early embryonic development mainly occurred in pre-winter, when the head, thorax, abdomen and appendages differentiated completely. Embryonic development arrested during winter, but resumed rapidly post-winter. [Conclusion] Respiratory metabolism is closely related to the process of embryonic development during overwintering. In order to survive the winter, G. sibiricus eggs adjust their physiological state by constantly regulating their respiratory metabolism and metabolic substrates to adapt to changing external environmental conditions.