Data from: Male clasping ability, female polymorphism and sexual conflict: fine-scale elytral morphology as a sexually antagonistic adaptation in female diving beetles
Karlsson Green, Kristina, Lund University
Kovalev, Alexander, Kiel University
Svensson, Erik I., Lund University
Gorb, Stanislav N., Kiel University
Published Jul 03, 2013 on Dryad.
Cite this dataset
Karlsson Green, Kristina; Kovalev, Alexander; Svensson, Erik I.; Gorb, Stanislav N. (2013). Data from: Male clasping ability, female polymorphism and sexual conflict: fine-scale elytral morphology as a sexually antagonistic adaptation in female diving beetles [Dataset]. Dryad. https://doi.org/10.5061/dryad.5gs75
During sexual conflict, males and females are expected to evolve traits and behaviours with a sexually antagonistic function. Recently, sexually antagonistic coevolution was proposed to occur between male and female diving beetles (Dytiscidae). Male diving beetles possess numerous suction cups on their forelegs whereas females commonly have rough structures on their elytra. These rough structures have been suggested to obstruct adhesion from male suction cups during mating attempts. However, some diving beetle species are dimorphic, where one female morph has a rough elytra and the other has a smooth elytra. Here, we used biomechanics to study the adhesive performance of male suction cups on the female morphs in two diving beetle species: Dytiscus lapponicus and Graphoderus zonatus. We compared adhesion on the rough and the smooth female morphs to infer the function of the rough elytral modifications. We found that the adhesive force on the rough structures was much lower than on other surfaces. These findings support the suggestion of sexual conflict in diving beetles and a sexually antagonistic function of the rough female structures. In addition, males differed in their adhesive capacity on different female surfaces, indicating a male trade-off between adhering to smooth and rough female morphs.
Adhesion of male diving beetles suction cups
Data from adhesion measurements of male diving beetle suction cups on different surfaces. The surfaces include glass (measured both with the sensor operated by a manipulator and manually) and the elytra and pronotum of both males and two female morphs. Data comes from two species (Dytiscus lapponicus and Graphoderus zonatus) and two different locations (Östra Skivsjön and Lomtjärn). The data file includes the maximum, minimum and mean of each adhesion event, the time of the measurment, the baseline, the calibration factor used for calculations and the calculated adhesion and loading force.