REWM 3500 Friday, August 28, 2009 Organizing concepts in physiological plant ecology

1. REWM 3500 Friday, August 28, 2009 Organizing concepts in physiological plant ecology I. Reductionism and holism in ecology II. Physiological ecology and the distribution of organisms III. Plant responses to “stress”

2. I. Reductionism and holism in ecology

3. II. Physiological ecology and the distribution of organisms

4. Multiple limiting resources is the reality

5. Excess of resources (toxic) Multiple limiting resources Single limiting resource Figure 5.03 – Taiz and Zeiger 2006

6. Tolerance to environmental extremes

7. The biotic “filter” Grown alone Grown together

8. Response to stress in plants From Lambers, Chapin and Pons 1998

9. Population adaptation to environmental temperature From Lambers, Chapin and Pons 1998

10. Ecotypes - locally adapted populations From Lambers, Chapin and Pons 1998

11. Terms to know: Reductionism Holism Organismal theory of community organization Individualistic theory of community organization Historical filter Physiological filter Biotic filter Microenvironment Liebig’s law of the minimum Law of [multiple] limiting factors Law of tolerance Optimal vs realized distribution (physiological vs ecological amplitude) Homeostasis Stress Stress response Acclimation Phenotypic plasticity Adaptation Stress resistance Stress tolerance Stress avoidance