Day length constrains the time budget of aphid predators  

作　　者：Jens Joschinski Tim Kiess Jochen Krauss 

机构地区：[1]Department of Animal Ecology and Tropical Biology,Biocentre,University of WEirzburg,WEtrzburg,Germany

出　　处：《Insect Science》2019年第1期164-170,共7页昆虫科学（英文版）

摘　　要：Phenology shifts and range expansions cause organisms to experience novel day length-temperature correlations.Depending on the temporal niche,organisms may benefit or suffer from changes in day length,thus potentially affecting phenological adaptation. We assessed the impact of day length changes on larvae of Chrysoperla carnea (Stephens) and Episyrphus balteatus (De Geer),both of which prey on aphids.Larvae ofE.balteatus are night-active,whereas those of C.carnea appear to be crepuscular.We subjected both species in climate chambers to day lengths of 16 :8 L :D and,to circumvent diapause responses,20 :4 L :D.We recorded development times and predation rates of both species. E.balteatus grew 13%faster in the 16 :8 L :D treatment and preyed on significantly more aphids.In contrast,C.carnea grew 13% faster in the 20 :4 L :D treatment and higher predation rates in 20 :4 L :D were marginally significant.Our results show that day length affects development and predation,but that the direction depends on species. Such differences in the use of day length may alter the efficiency ofbiocontrol agents in a changing climate.

关 键 词：Chiysoperla carnea CLIMATE change Episyrphus balteatus INSECT TIMING PHENOLOGY PHOTOPERIOD 

分 类 号：Q[生物学]