(Frontiers) Many organisms compete for access to and acceptance by mates. In a recent study, researchers show that the sperm of Arctic char, a cold-water fish common to alpine lakes, swim at different speeds in different fluids, depending on whether the fish are dominant or submissive. The different strategies between the dominant and the submissive males illustrate reproductive advantages, depending on their typical distance from the female.
from EurekAlert! - Social and Behavioral Science http://ift.tt/2ifiY39
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