caa a22 4500 397571577 CHVBK 20180308164843.0 cr unu---uuuuu 161202e19961001xx s 000 0 eng 10.1093/ee/25.5.1032 doi (NATIONALLICENCE)oxford-10.1093/ee/25.5.1032 Dispersal of Five Aphids (Homoptera: Aphididae) in Relation to their Impact on Hordeum vulgare [Elektronische Daten] [Patricia A. Mackay, Robert J. Lamb] Insect herbivores that have high impacts on their host plants reduce the longevity of their habitats and require dispersal mechanisms. This hypothesis was tested by comparing the life history traits, particularly short- and long-distance dispersal mechanisms, of 5 aphid species in relation to their impact on barley, Hordeum vulgare L. The aphids were bird cherry-oat aphid, Rhopalosiphum padi (L.), and rose-grain aphid Metopolophium dirhodum (Walker), important pests of cereal crops; corn leaf aphid, Rhopalosiphum maidis (Fitch), an occasional pest; and rusty plum aphid, Hysteroneura setariae (Thomas), and Sitobion nr. fragariae, which are not pests. The specific impacts of the 5 species on barley were similar, based on a biomass conversion ratio of a 3.4-mg reduction in plant growth for each milligram gained in aphid biomass. The value of the numerical impacts varied, being highest for large species that produced offspring earliest in their reproductive periods. The density dependence of biomass increase was highest for species with high numerical impacts on the plant. Three measures of short-distance dispersiveness varied substantially among the species, but were not related to their numerical impact. Long-distance dispersiveness, measured as the proportion of winged offspring produced in response to crowding, was related to numerical impact for 4 of the 5 species. The 5th, Sitobion nr. fragariae produced many winged offspring without crowding and is probably adapted to inherently short-lived habitats. Aphid species that rapidly affect the quality of their host plants have evolved a level of long-distance dispersiveness proportional to their impact on their host plants. © 1996 Entomological Society of America Population Ecology nationallicence cereal aphids nationallicence life history nationallicence migration nationallicence herbivory nationallicence Mackay Patricia A. Department of Entomology, University of Manitoba, Winnipeg, MB, Canada R3T 2N2 aut Lamb Robert J. Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, MB, Canada R3T 2M9 aut Environmental Entomology Oxford University Press 25/5(1996-10-01), 1032-1044 0046-225X 25:5<1032 1996 25 ee https://doi.org/10.1093/ee/25.5.1032 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.5.1032 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mackay Patricia A. Department of Entomology, University of Manitoba, Winnipeg, MB, Canada R3T 2N2 aut NATIONALLICENCE 700 1- Lamb Robert J. Agriculture & Agri-Food Canada, 195 Dafoe Road, Winnipeg, MB, Canada R3T 2M9 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/5(1996-10-01), 1032-1044 0046-225X 25:5<1032 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford