Factors shaping life history traits of two proovigenic parasitoids  

作　　者：Michal SEGOLI Shucun SUN Dori ENAVA Jay A.ROSENHEIM 

机构地区：[1]Mitrani Department of Desert Ecology,The Jacob Blaustein Institutes for Desert Research,Ben-Gurion University of the Negev,Midreshet Ben-Gurion,Israel [2]Department of Ecology,School of Life Science,Nanjing University,Nanjing,China [3]Embrapa Clima Temperado(Embrapa Temperate Agriculture),Pelotas,Rio Grande do Sul,Brazil [4]Department of Entomology and Nematology,University of California Davis,Davis,California,USA

出　　处：《Integrative Zoology》2018年第3期297-306,共10页整合动物学（英文版）

摘　　要：What shapes the relative investment in reproduction versus survival of organisms is among the key questions in life history.Proovigenic insects mature all their eggs prior to emergence and are short lived,providing a unique opportunity to quantify their lifetime investments in the different functions.We investigated the initial eggloads and longevity of 2 proovigenic parasitoid wasps:Anagrus erythroneurae and Anagrus daanei,(Hymenoptera:Mymaridae)that develop within leafhopper eggs in both agricultural vineyards and natural riparian habitats in Northern California.We collected Vitis spp.leaves containing developing parasitoids from 3 natural sites(Knight Landing,American River and Putah Creek)and 3 agricultural vineyards(Solano Farm,Davis Campus and Village Homes).We recorded eggloads at parasitoid emergence and female parasitoid longevity with or without honey-feeding.Theory predicts that parasitoids from vineyards(where hosts are abundant)would have higher initial eggloads and lower longevity compared with parasitoids from riparian habitats(where hosts are scarce).Although host density and parasitoid eggloads were,indeed,higher in vineyards than in riparian habitats,parasitoid longevity did not follow the predicted pattern.Longevity without feeding differed among field sites,but it was not affected by habitat type(natural vs agricultural),whereas longevity with feeding was not significantly affected by any of the examined factors.Moreover,longevity was positively,rather than negatively,correlated with eggloads at the individual level,even after correcting for parasitoid body size.The combined results suggest a more complex allocation mechanism than initially predicted,and the possibility of variation in host quality that is independent of size.

关 键 词：Anagrus parasitoids eggload LEAFHOPPERS life-history tradeoffs LONGEVITY 

分 类 号：S47[农业科学—农业昆虫与害虫防治]