NPB 102 Lecture 2: Lecture 2
23 Apr 2018
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Document Summary
They remove egg shells to reduce risk of predation on the newly hatched chicks. Eggs near broken shells will be eaten more frequently than eggs far from broken egg shells (eggs cant move, chicks can move) Broken egg shell and intact egg near and far (15cm, 100cm, 200cm) Percentage of eggs taken (42, 32, 21) Therefore, if shells are closer to intact egg, then predation rates increase. If shells are far apart then predation rates decrease. Measuring how long it takes for adult bird to remove egg shells after egg is hacted. Adult eating the shells due to loss of ca2+ deficient. Removal of shells increases incubation for other eggs (unhatched) Hypothesis: queensnakes tend to eat freshly molted crayfish because they are less likely to inflict injuries on the snakes than are hardshelled crayfish. Alternative hypothesis: snakes uses cues from hard and soft shell of crayfish.
