Lecture 13

Lecture 13 - A nti-predator behavior - Avoid being detected...

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Anti-predator behavior - Avoid being detected - Advertise toxicity or danger - Fake it - Advertise unprofitability Advertise unprofitability - In this case, the prey communicates to the predator that capture is unlikely o Classic study: Stotting in gazelles – Tim Caro Thomson’s gazelles and cheetahs Cheetah predator Cheetahs were more likely to abandon the hunt when gazelles stot b/c Cheetahs were unsuccessful at killing the animal If a gazelle sees a cheetah it runs away and then stots Tim asked why? (3 rd question) The way time went about answering this question will introduce to the hypothesis of strong inference Strong inference Observation: light go out in the room Possible explanations: power outage, turns the switch off, bulb burned out, fuse blew out, suddenly went blind Bulbs would not be out throughout campus Go to another room to rule out the explanations Inference: come up with a simple test to r/o explanations Tim observed animals stotting and noticed that gazelles had a white rump patch He thought the white patches might be lined to communication Tim came up with 4 hypothesis to examine Alarm signal hypothesis: o Stoting warns offspring that a predator is nea, this increase survival of young o Prediction Only grouped gazelle shoud stits White rumop patch should always be directed toward gazelles Sottting advertise unprofitability o Stotting tells the cheetahs that he has been seen and that the gazelle has enough of a head start to outrun it over the long distance o Prediction Solitary or group gazelles should stot White rump patch should be directed towards the predator
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Stoting cinfuses the predator o Sottig confuses predaotrs so they can’t focud on a single target o Predictios Only grouped gazelles should stot White tump patch should face the predator Stotting pro motes social cohesion o Stotting enables gazelles to form groups and flee in a coordinated manner that prevents the predator from the cutting one ou the heard o Prediction Only solitary gazelles should stot (so they can ‘group’ from a distance) White rump patch should be directed towards other gazelles Summary of prediction Grouped Solitrary In out Alarm signal X x unprofitability X X X Confusion x X Cohesion x X Use strong inference to test these ideas Caro found that gazelles would stot when approached by a landrover
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Lecture 13 - A nti-predator behavior - Avoid being detected...

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