Novel insights into paternity skew in a polyandrous social wasp

We examined the level of polyandry and paternity skew in the common eastern yellowjacket wasp,Vespula maculifrons, in order to gain a greater understanding of conflict in social insects. We collected 10 colonies ofV. maculifrons and genotyped workers and prereproductive queens at highly variable microsatellite markers to assign each to a patriline. Genotypic data revealed evidence of significant paternity skew among patrilines. In addition, we found that patrilines contributed differentially to caste production (worker vs. queen), suggesting an important role for reproductive conflict not previously discovered. We also investigated if patterns of paternity skew and mate number varied over time. However, we found no evidence of changes in levels of polyandry when compared to historical data dating back almost 40  years. Finally, we measured a suite of morphological traits in individuals from the most common and least common patrilines in each colony to test if males that showed highly skewed reproductive success also produced offspring that differed in phenotype. Our data revealed weak correlation between paternity skew and morphological phenotype of offspring sired by different males, suggesting no evidence of evolutionary tradeoffs at the level investigated. Overall, this study is the first to report significant paternity and caste-associated skew inV. maculifrons, and to investigate the phenotypic consequences of skew in a social wasp. Our results suggest that polyandry ca...
Source: Insect Science - Category: Biology Authors: Tags: ORIGINAL ARTICLE Source Type: research