EEB 3408W Lecture 5: ecology lecture 5
5 Feb 2017
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Document Summary
Monarch butterfly case study - 4 stages of the butterfly life cycle. Hang upside down to pump nutrients to wings. Revisit assumption that all individuals are equal. Most cannot reproduce until some time after they are born. Individuals are usually not identical in regards to reproduction. Monarchs fly up to texas, lay eggs there. First generation is born and travels up about kansas and lay eggs there. Signals to travel back to mexico (milkweed, day length, sunlight hours) Stay in mexico in winter november to march. Global warming allows them to stay north for longer but the milkweed (food) for them does not stay nutritious for that long. Survivorship curves - x axis is age, y is number of survivors. Type i - human population, juvenile survival is high, older people die. Type ii - survivorship die at equal rates regardless of age.
