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STARLINGS EXPLOITING PATCHES: THE EFFECT OF RECENT EXPERIENCE ON FORAGING DECISIONS

STARLINGS EXPLOITING PATCHES: THE EFFECT OF RECENT EXPERIENCE ON FORAGING DECISIONS. Innes C. Cuthill, Alejandro Kacelnik, John R. Krebs, Patsy Haccou & Yoh Iwasa Anim. Behav., 1990, 40, 625-640. Introduction – Background.

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STARLINGS EXPLOITING PATCHES: THE EFFECT OF RECENT EXPERIENCE ON FORAGING DECISIONS

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  1. STARLINGS EXPLOITING PATCHES: THE EFFECT OF RECENT EXPERIENCE ON FORAGING DECISIONS Innes C. Cuthill, Alejandro Kacelnik, John R. Krebs, Patsy Haccou & Yoh Iwasa Anim. Behav., 1990, 40, 625-640

  2. Introduction – Background • Model of rate maximization→ the average number of prey taken per visit • Starlings past experience of travel times→ adjust the number of prey taken

  3. Introduction – Question • Howstarlings respond to short-term changes in travel time within an experimental session? • Recent experience of travel times influencesnumber of prey taken per visit

  4. Experiment 1General methods Feeding Area Travel Area

  5. Apparatus Green light off Green light off 鳥離開 Feeder perch In the “patch” Feeder perch Hops (h=exp(G/1.5)) 1, 3, 7, 14, 28, … Feeder 2 sec 停在其中一個travel perch 達到目標 5 or 60次 Red light (2) on All lights off The other side of green light on 綠色燈交替開關引導達成目標 Red light (1) on Green light on

  6. Experiment 1 △: bird 0;　○: bird 1;●: bird 2; ◇: bird 3;■: bird 4;□: bird 5

  7. Experiment 1

  8. Experiment 1 : short travel requirements □: longtravel requirements ■: predicted prey per visit following shorttravel requirement ＋: predicted following long travelrequirement

  9. Experiment 1 conclusion • The birds’ behavior based only on the most recent travel time WHY??

  10. Experiment 1 conclusion • Test the hypothesis that the results of experiment 1 are caused by digestive constraint : short travel requirements □: longtravel requirements ■: predicted prey per visit following shorttravel requirement ＋: predicted following long travelrequirement

  11. Experiment 2General methods

  12. Experiment 2 △: bird 0;　○: bird 1;●: bird 2; ◇: bird 3;■: bird 4;□: bird 5

  13. Experiment 2 : short travel requirements □: longtravel requirements

  14. Cnclusion • Non-adaptive behavior hypothesis • Interruptions to foraging • Use of recent experience • Alternative currencies

  15. The End

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