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Unformatted text preview: green What might egg color indicate? EASTERN BLUEBIRD EXAMPLE PIED FLYCATCHER EXAMPLE SPOTLESS STARLING EXAMPLE How might eggshell color function? a. Indicate investment by female? b. Provide fortification or protection for offspring? c. Helps to discriminate eggs from brood parasites? d. Affects paternal care? Functions of brown speckles? a. Mimicry? b. Crypsis? c. Egg strengtheners? GREAT TIT EXAMPLE 5.) Clutch Size Two general strategies: Fixed – always the same number of eggs Variable – can change clutch size What determines clutch size? Parental ability Risk of loss Phylogeny Once again, we have a cost-benefit ratio. Factors affecting clutch sizes: Ecological effects – territory size, prey availability Latitude Ashmole’s Hypothesis – Because there is higher food availability at higher latitudes during breeding times, females can invest more in reproduction at higher latitudes = larger clutch sizes....
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- Spring '09
- cost-benefit ratio, Smallest bird egg, Largest bird egg, species Egg color