BI 132 Lecture Notes - Lecture 9: Evolutionary Arms Race, Pronghorn, Aggressive Mimicry

• School: University of Oregon
• Department: Biology
• Course: BI 132
• Professor: Debbie Schlenoff

Document Summary

Bi 132 lecture 9 antipredator adaption. An oystercatcher eats medium size shellfish because they have more calories than smaller shellfish but are easier to open than larger shellfish. This is an example of: optimal foraging, aggressive mimicry, tool use, an evolutionary arms race. Adaptions in sensory systems, physiology, and behavior for detection and escape from. Predators: examples, precocial offspring such as pronghorn, ability to detect the scent of a predator a single compound in urine of carnivores triggers an instinctual avoidance response. Crypsis: blend in with the background, difficult to see. Crypsis: disruptive coloration: break up the outline of an animal, examples, zebra, ornate cowfish, cheetahs. Crypsis: countershading: coloration dark above and light underneath, examples, seals, penguins, lizards. Crypsis: ability to change color: chameleon, seasonal fur color, snowshoe hare, willow ptarmigan. Crypsis: looks like something in the environment: leafy sea dragon. 2: leaf-tailed gecko, leafbug, some bugs look like animal droppings.