Life cycle and nymphal feeding of Besdolus ravizzarum （Plecoptera： Perlodidae）, a threatened stonefly  

作　　者：Stefano Fenoglio Tiziano Bo Manuel Jesus Lepez-Rodriguez Jose Manuel Tierno de Figueroa 

机构地区：[1]Dipartimento di Scienze dell'Ambiente e della Vita, Universita del Piemonte Orientale, Alessandria, Italy [2]Departamento de Biologia Animal, Facultad de Ciencias, Universidad de Granada, Granada, Spain

出　　处：《Insect Science》2010年第2期149-153,共5页昆虫科学（英文版）

摘　　要：We have studied some aspects of Besdolus ravizzarum biology in the Apen- nines. This stonefly has a very localized distribution in southeastern France and northern Italy. This species is considered threatened. For this reason it is especially relevant to improve knowledge about its natural history, previously unknown. Despite the large size of nymphs, this species shows a univoltine life cycle. The growth is slow but uniform from October to April or May when the short flight period occurs. The analysis of the gut con- tents indicates this species is a predator, feeding mainly on Baetidae and Chironomidae. It is notable that the development of this carnivorous species through cold periods coincides with the season with higher richness and density of potential prey in Apennine streams. Further studies are needed to improve knowledge of the distribution of the species and to start planning effective conservation efforts.We have studied some aspects of Besdolus ravizzarum biology in the Apen- nines. This stonefly has a very localized distribution in southeastern France and northern Italy. This species is considered threatened. For this reason it is especially relevant to improve knowledge about its natural history, previously unknown. Despite the large size of nymphs, this species shows a univoltine life cycle. The growth is slow but uniform from October to April or May when the short flight period occurs. The analysis of the gut con- tents indicates this species is a predator, feeding mainly on Baetidae and Chironomidae. It is notable that the development of this carnivorous species through cold periods coincides with the season with higher richness and density of potential prey in Apennine streams. Further studies are needed to improve knowledge of the distribution of the species and to start planning effective conservation efforts.

关 键 词：CONSERVATION life history northern Italy STONEFLY threatened species trophic role 

分 类 号：S435.112.3[农业科学—农业昆虫与害虫防治] S813[农业科学—植物保护]