Skewed paternity distribution in the extremely size dimorphic Musk Duck (Biziura lobata)

Abstract

Although most species of Anseriformes form long-term or seasonal pair-bonds and breed monogamously, some are thought to be polygynous. The Musk Duck (Biziura lobata) is unique among Anseriformes in that it has been suggested to have a lek mating system. Musk Ducks also display extreme size dimorphism and many secondary sexual traits whose functions are not clearly understood. We studied paternity in a resident population of Musk Ducks in order to explore the genetic mating system and to investigate the role of different male secondary sexual traits. We obtained blood samples from seven males, five breeding females and seven ducklings from six broods on Lake Wendouree, Ballarat, Australia, du..