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SPLIT SEX RATIO DUE TO MATERNAL CONDITION

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posted on 15.03.2021, 00:06 by Alihan KatlavAlihan Katlav, James M Cook, Markus Riegler

The data set describes the post-mating constrained sex allocation in Kelly’s citrus thrips, Pezothrips kellyanus (Thysanoptera: Thripidae). It demonstrates the results of three separate crossing experiments: experiment 1) analysis of mating effectiveness by dissection of spermathecae of mated females; experiment 2) test for the presence of a paternal sex ratio (PSR) element by assessing the sex ratio patterns in two successive generations, as well as the data for mating time and male size (forewing length) measurements; and experiment 3) analysis of effect of maternal fitness [female body size (forewing length) and size of eggs ovipositioned before mating] on sex ratio after mating. Mother types are categorised according to their mating status and their offspring sex ratio: virgins [V], constrained mated females producing male-biased broods (M-broods) [M(♂)] and unconstrained mated females, producing female biased broods (F-broods) [M(♀)]. The brood types of mated females are categorized as F and M denoting female-biased and male-biased brood types, respectively. According to the data, all P.kellyanus mated females were successfully inseminated irrespective of their brood-types produced (experiment 1 – spreadsheet 1). M-brood production is not paternally inheritable: the prevalence of M-brood production was not different between matings that involved males produced by virgin and unconstrained mothers (experiment 2 – spreadsheets 2 and 3). Moreover, brood-type was not affected by mating duration and male size (experiment 2 – spreadsheets 4 and 5). Finally, the data reveals mother size and egg size (maternal effects) influence brood-type: smaller females (producing smaller eggs in virginity) are more likely to produce M-broods after mating. These results indicate that the constrained sex allocation in P. kellyanusis due to the maternal condition and the resource investment towards egg size.

Funding

Australia and Pacific Science Foundation research grant (APSF16/5)

F.G. Swain Award of the Hawkesbury Foundation

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