caa a22 4500 469098678 CHVBK 20180323133038.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF01875447 doi (NATIONALLICENCE)springer-10.1007/BF01875447 Host selection behavior of a thistle-feeding fly: choices and consequences [Elektronische Daten] [R. Lalonde, B. Roitberg] Summary: Female Canada thistle seed flies (Orellia ruficauda) preferentially oviposit into seed heads which are a single day from opening. When flies are forced to oviposit into flower heads at other stages of development, offspring typically do slightly poorer: they attain a mature mass of about 15% less than do larvae derived from preferred hosts. Larval mass correlates strongly with reproductive success: heavy larvae develop into adults that produce eggs at a faster rate than do those developing from small larvae. After laying a clutch of eggs, flies circumscribe the rim of the flowerhead with their extended ovipositor and deposit a clear fluid. Flies reject previously-attacked hosts, bearing this apparent marking pheromone, significantly more often than they reject unattacked hosts. Costs of superparasitism in this system are relatively small, inasmuch as there is only a weak relationship between clutch size and larval success at the densities measured in this study. We speculate that flies are highly selective, when the apparent costs of making a mistake are rather low, because the information provided by phenological cues and by the putative marking pheromone is highly reliable, and low fecundity and time costs allow sufficient time to express a high level of discrimination. Springer-Verlag, 1992 Host selection nationallicence Marking nationallicence Superparasitism nationallicence Fecundity nationallicence Lalonde R. Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, B.C., Canada aut Roitberg B. Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, B.C., Canada aut Oecologia Springer-Verlag 90/4(1992-07-01), 534-539 0029-8549 90:4<534 1992 90 442 https://doi.org/10.1007/BF01875447 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01875447 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lalonde R. Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, B.C., Canada aut NATIONALLICENCE 700 1- Roitberg B. Behavioural Ecology Research Group, Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, B.C., Canada aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 90/4(1992-07-01), 534-539 0029-8549 90:4<534 1992 90 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer