SPLIT SEX RATIO DUE TO MATERNAL CONDITION

The data set describes the post-mating constrained sex allocation in Kelly’s citrus thrips, <i>Pezothrips kellyanus </i>(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 <i>P.</i><i>kellyanus </i>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 <i>P. kellyanus</i>is due to the maternal condition and the resource investment towards egg size.

本数据集描述了凯利柑橘蓟马（*Pezothrips kellyanus*，缨翅目：蓟马科）的交配后约束性性别分配。本数据集展示了三项独立杂交实验的结果：实验1通过解剖已交配雌虫的受精囊，分析交配有效性；实验2通过评估两代连续的性别比例模式，检测父本性别比例（PSR）因子的存在，同时包含交配时长与雄虫体型（前翅长度）的测量数据；实验3分析母本适合度[雌虫体型（前翅长度）以及交配前产出的卵粒大小]对交配后性别比例的影响。母本类型根据其交配状态与后代性别比例分为三类：处女雌虫（V）、产生偏雄后代群（M群）的受限交配雌虫[M(♂)]，以及产生偏雌后代群（F群）的非受限交配雌虫[M(♀)]。交配雌虫的后代群类型分为F与M两类，分别代表偏雌后代群与偏雄后代群。基于本数据集，所有*P. kellyanus*的交配雌虫无论其产生的后代群类型如何，均成功完成受精（实验1——数据表1）。偏雄后代群的产生不具备父本遗传性：由处女雌虫与非受限母本所产生的雄虫进行交配时，偏雄后代群的产生比例并无显著差异（实验2——数据表2与3）。此外，后代群类型不受交配时长与雄虫体型的影响（实验2——数据表4与5）。最后，数据表明母本体型与卵粒大小（母本效应）会影响后代群类型：体型更小的雌虫（处女状态下会产出更小的卵）在交配后更易产生偏雄后代群。上述结果显示，*P. kellyanus*的约束性性别分配源于母本状态与对卵粒大小的资源投入。