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After 8 weeks, parasitoids were introduced to the systems. Two pairs of wasps were introduced to four randomly selected patches in each of the metapopulations for two consecutive weeks. Adult wasps were counted, and the dead individuals removed, each week at the same time as the beetle census. These data provide local scale time series for beetle and wasp abundance. Due to overlapping generations resulting from variable longevity and larval development periods these http://www.selleckchem.com/products/Rapamycin.html time series describe continuous generations of both species. Harvesting strategies (Table?1) were commenced in week 26 after the populations had settled to a host-parasitoid steady state. Harvesting was conducted on adult bruchids at a local level. Individuals within a patch were harvested at random using a grid system. Grids were approximately the size of one adult beetle and cells for harvesting were chosen at random. All experiments were run for a total of 48?weeks, replicated four times and carried out under constant environmental conditions of 30?��C, 70% humidity and 16?:?8?h of light?:?dark. The time series abundance data was divided into three sections; host only, host?:?parasitoid and host?:?parasitoid?:?harvest. The effect of harvesting regime on population size and the variation in population size were analysed using linear mixed effects models http://www.selleck.cn/products/PD-98059.html in which replicate was designated as a random variable. This enabled us to determine the level of variation arising between replicates. Even though replicates were identical, this is an important consideration in statistically modelling the effects of harvesting as each time series is a single realization of an underlying stochastic process (Chatfield 2004). The number of local host extinction events was compared between harvesting treatments using a generalized linear model with Poisson errors (Crawley 2007). Finally, the yield from different harvesting regimes was compared using analysis of variance. All analyses were conducted using R version 2.5.1 (R Foundation for Statistical Computing 2009). Time series for the abundances of C. maculatus and A. calandrae are shown in Fig.?5. http://www.selleckchem.com/products/Everolimus(RAD001).html These graphs illustrate the three phases of the experiment; host only, host?:?parasitoid and host?:?parasitoid?:?harvest. Across all treatments and replicates the weekly bruchid population size decreased as the experiment progressed through each of the successive stages (F2,950?= 353��186, P?