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Reproductive and Somatic Effort in Dogwoods Week II

Reproductive and Somatic Effort in Dogwoods Week II. Principles of Ecology BIOL 3060. Review. Life history An organism’s typical pattern of : Growth & Survival Reproduction Somatic effort Growth/survival Reproductive effort Phenotypic plasticity A single organism can have >1 phenotype

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Reproductive and Somatic Effort in Dogwoods Week II

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  1. Reproductive and Somatic Effort in DogwoodsWeek II Principles of Ecology BIOL 3060

  2. Review • Life history • An organism’s typical pattern of : • Growth & Survival • Reproduction • Somatic effort • Growth/survival • Reproductive effort • Phenotypic plasticity • A single organism can have >1 phenotype • Spigot Model • Reproduction only when somatic is topped-off

  3. Age & Reproduction Hypothesis 1 H1 With more energy on one size of a plant than the other, phenotypic plasticity allows greater reproduction to occur on that side. prediction: the sunny side of the tree has more flower buds than the shady side.

  4. Age & Reproduction Hypothesis 2 H2 Trees with more total energy can invest more in reproduction. prediction: trees with more sun have more flower buds.

  5. Age & Reproduction Hypothesis 3 H3 Delayed maturity and indeterminate growth cause older/larger trees to have greater reproduction. prediction: there is a significant positive correlation between the proportion of flower buds and the DBH of the tree.

  6. H1 prediction: % flower buds is greater on the sunny than shady side of roadside trees T-TEST Note: this is a one-tailed test, with 38 d.f. X1 AVG % flower buds on the sunny side (roadside) X2 AVG % flower buds on the shady side (roadside)

  7. H2 prediction: % flower buds is greater for trees in the sun than for those in the shade T-TEST Note: this is a one-tailed test, with 38 d.f. X2 AVG % flower buds in understory X1 AVG % flower buds on sunny side of roadside trees

  8. H3 prediction: % flower buds and tree age/size (DBH) are significantly positively correlated Correlation a) If there is NO difference between % flower buds in sunny and shady environments: b) If there IS a difference between % flower buds in sunny and shady environments: Correlation #1: % total flower buds on roadside trees (y-axis) vs DBH (x-axis) Correlation #1: % total flower buds on roadside and understory trees (y-axis) vs DBH (x-axis) Correlation #2: % total flower buds on understory trees (y-axis) vs DBH (x-axis)

  9. Why would we do the analysis two different potential ways?

  10. H3 prediction: % flower buds and tree age-size (DBH) are significantly positively correlated Hypothesis & Prediction 3 CORRELATION ANALYSIS What do you get? → correlation coefficient: r -positive/negative relationship -significance of relationship If correlation (r) between mean % flower buds and DBH is positive, look up the significance Note: (n1-2) = d.f.

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