caa a22 4500 39754684X CHVBK 20180308164740.0 cr unu---uuuuu 161202e19961101xx s 000 0 eng 10.1093/aesa/89.6.875 doi (NATIONALLICENCE)oxford-10.1093/aesa/89.6.875 Patterns of Egg Load in the Walnut Fly Rhagoletis juglandis (Diptera: Tephritidae) in Nature and Their Possible Significance for Distribution of Sexes [Elektronische Daten] [Henar Alonso-Pimentel, Daniel R. Papaj] In a field study of the tephritid fly Rhagoletis juglandis Cresson on its host Juglans major (Torrey) Heller, the density of both sexes on host foliage remained more or less constant throughout the season. The density of each sex on fruit, by contrast, increased steadily over the course of several weeks. The density of males on fruit increased much more sharply than that of females. Associated with the temporal increase in relative fly density on fruit was an increase in the mean number of eggs in a female's ovaries (i.e., egg load). This pattern in egg load was not caused by an increase in the mean egg load of individuals carrying eggs (which remained more or less constant over the season), but rather by an increase in the number of individuals that carried any eggs at all (i.e., the number of reproductively mature individuals). Late in the season, mean egg load of females in the foliage was lower than that of females on fruit for each of 2 yr, but the difference was not statistically significant. Within a given location (fruit versus foliage), egg load was associated with female activity. Females attempting to oviposit on fruit and females found in mating pairs on foliage had high mean egg loads, whereas females feeding on foliage and females dragging their ovipositor (indicative of recent clutch deposition) on fruit had low mean egg loads. We discuss how results for this species conform to a generally held scenario for the distribution of frugivorous tephritid flies in time and space. © 1996 Entomological Society of America Behavior nationallicence Rhagoletis nationallicence egg load nationallicence sex ratio nationallicence Tephritidae nationallicence oviposition nationallicence fruit fly nationallicence Alonso-Pimentel Henar Department of Ecology and Evolutionary Biology and Center for Insect Science, University of Arizona, Tucson, AZ 85721. aut Papaj Daniel R. Department of Ecology and Evolutionary Biology and Center for Insect Science, University of Arizona, Tucson, AZ 85721. aut Annals of the Entomological Society of America Oxford University Press 89/6(1996-11-01), 875-882 0013-8746 89:6<875 1996 89 aesa https://doi.org/10.1093/aesa/89.6.875 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/aesa/89.6.875 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alonso-Pimentel Henar Department of Ecology and Evolutionary Biology and Center for Insect Science, University of Arizona, Tucson, AZ 85721 aut NATIONALLICENCE 700 1- Papaj Daniel R. Department of Ecology and Evolutionary Biology and Center for Insect Science, University of Arizona, Tucson, AZ 85721 aut NATIONALLICENCE 773 0- Annals of the Entomological Society of America Oxford University Press 89/6(1996-11-01), 875-882 0013-8746 89:6<875 1996 89 aesa Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford