LIFESCI 3C03 Chapter Notes - Chapter 6: Guppy, Waggle Dance, Stable Distribution
27 Jan 2017
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Dilute risk of attack (swamping predators and selfish herding) Individuals associate with others as a form of cover-seeking, to reduce their personal risk of attack. If an individual is in a group of n individuals, it has a 1/n chance of being the victim. Attacked by blood sucking flies, which transmit disease. When flies are most active, horses aggregate into bigger groups. Flies are attracted to larger groups of horses, yet attack rate per horse is lower in the larger group. Adults mate, lay eggs, and die (unavailable for protection from water surface predators) Synchronous hatching causes swamping of predators, decreasing likelihood of capture. Individuals approach others and continuously move to reduce their domain of danger. Fur seals: decoy seals closer to the outside of the group were targeted more often by sharks. Individuals in the middle of the group are safer than those on the outside.
