After having journeyed half way across the globe to reach their breeding grounds in the Arctic, male pectoral sandpipers fly thousands of kilometres more through their breeding range. Bart Kempenaers and Mihai Valcu of the Max Planck Institute for Ornithology in Seewiesen discovered that these birds are always ready to move on and visit up to 24 potential breeding sites. Presumably they are searching for mating opportunities to increase their reproductive success. The mating system of pectoral sandpipers Calidris melanotos is called male dominance polygyny. This means that males compete intensely for females, but leave them without any resources but sperm and without any investment in care for the offspring. Instead, males and females limit their interactions to short, not-so-romantic interludes. A s shown in a former study led by Bart Kempenaers and including sleep researcher Niels Rattenborg from the Max Planck Institute for Ornithology in Seewiesen , competition among males is so high that males have to reduce their sleep and defend and court females virtually non-stop throughout the endless arctic summer days to successfully reproduce. In the end, only few of the competing males will be able to sire offspring under these conditions. Highly elaborate courting rituals, exhausting fights with rivals, hardly any sleep and a male can consider himself lucky to gain a copulation.
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