tailieunhanh - Báo cáo lâm nghiệp: "old hardiness as a factor for assessing the potential distribution of the Japanese pine sawyer Monochamus alternatus (Coleoptera: Cerambycidae) in China"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Cold hardiness as a factor for assessing the potential distribution of the Japanese pine sawyer Monochamus alternatus (Coleoptera: Cerambycidae) in China. | 449 Ann. For. Sci. 63 2006 449-456 INRA EDP Sciences 2006 DOI forest 2006025 Original article Cold hardiness as a factor for assessing the potential distribution of the Japanese pine sawyer Monochamus alternatus Coleoptera Cerambycidae in China Rui-Yan MAa b Shu-Guang HAOa Wei-Na KONGb Jiang-Hua SUNa Le KANGa a State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of Zoology Chinese Academy of Sciences Beijing 100080 China b Department of Entomology Shanxi Agricultural University Taigu 030801 China Received 31 May 2005 accepted 3 November 2005 Abstract - To assess cold tolerance as a factor for potential distribution of Monochamus alternatus parameters of cold hardiness and acclimation responses of the beetle were examined. Supercooling points SCPs of eggs larvae pupae and adults were significantly different the eggs having the lowest value C and the adults the highest C . No significant differences were observed between the SCPs of pupae and overwintering 5th instar larvae but mean SCPs significantly declined with the development of larval instars. Mortality of overwintering larvae increased as temperature declined and exposure to low temperatures was prolonged. No individual survived at -25 C. Lethal times of Lt50 and Lt95 were d and d at -10 C respectively. Acclimation significantly improved cold tolerance of autumn 4-5th instar larvae but not of overwintering larvae. Based on these results the -10 C January mean air temperature isotherm is suggested as the northern limit of the beetle potential distribution in China. Monochamus alternatus cold tolerance acclimation distribution limit isotherm Résumé - La resistance au froid comme facteur pour évaluer la distribution potentielle du scieur de pin japonais Monochamus alternatus Coleoptera Cerambycidae en Chine. Afin d estimer la resistance au froid et les capacités de dispersion de Monochamus alternatus nous avons étudié les réponses de ce coléoptère à la