LIFESCI 2D03 Lecture Notes - Lecture 23: Powerful Owl, Alarm Signal, Vigorish
12 Jan 2018
School
Department
Course
Professor
Document Summary
Mating in fiddler crabs m 1 large claw they wave back/forth as a display to f, and construct. + live in burrows but cant court while hiding: males emerge from refuges quicker after an attack if potential mating oppor. were avail, 30 small plots several males + burrows, in 15 had f, 15 without. When all males above ground passed model predator over and recorded how long m stayed in burrows (120 sec control vs <15 sec experimental) 12% m did not retreat in exp 100% did in control. Social groups set of individuals that live near and associate with one another. Selfish herd hypothesis predator is more likely to kill a member on the outside of a group because it will encounter outside individuals first. Group size effect vigilance behaviour of an individual declines as group size increases. Some animals interact with predators to deter attack.
