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Influences on clutch size, brood size and numbers of males in a clutch were identified using log-linear analyses, which are appropriate for small count data. Influences on sex ratios, the prevalence of all-female broods, and developmental mortalities were explored using logistic analyses, which are appropriate for proportional data. We report the percentage of deviance explained (%Dev) as an approximate analogue of r2 for log-linear and logistic models. We used backward stepwise procedures and aggregation of factor levels to obtain the parsimonious ��minimal http://www.selleckchem.com/products/bay-57-1293.html adequate model�� by model simplification (e.g. Crawley 1993; Wilson & Hardy 2002). We used the variance ratio, R, as a descriptive statistic to quantify the variance of brood sex ratios and developmental mortality across broods: R?=?1 indicates a binomial distribution, while R??1 indicate under- and over-dispersion, respectively (Krackow, Meelis & Hardy 2002). The Meelis test statistic, U, was used to assess the significance of any deviations from binomiality (Krackow, Meelis & Hardy 2002). Overall, we collected 2758 parasitized scales; 494 of these scales were parasitized by M.?luteolus. The remaining scales were parasitized by other Metaphycus species or by species belonging to other genera (Kapranas et?al. 2007). A few scales yielded both M.?luteolus and another parasitoid species, but this occurred rarely (n?=?7). In some cases, scale size and/or parasitoid mortality factors could not be assessed, but each part of the analysis was conducted using all suitable data available. There was a total data set of 395 clutches for assessing mortality, of which 371 were gregarious (clutch size?>?1). The number of eggs laid in each host (=?clutch size) ranged between one and nine, although 95% of clutches contained 1�C6 eggs, and clutch size increased with host size (log-linear analysis corrected for underdispersion; F1,403?=?289��72, P?