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REWM 3500Friday, 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”
I. Reductionism and holism in ecology
II. Physiological ecology and the distribution of organisms
Multiple limiting resources is the reality
Figure 5.03 – Taiz and Zeiger 2006
Single limiting resourceMultiple limiting resources
Excess of resources (toxic)
Tolerance to environmental extremes
The biotic “filter”
Grown together
Grown alone
Response to stress in plants
From Lambers, Chapin and Pons 1998
Population adaptation to environmental temperature
From Lambers, Chapin and Pons 1998
Ecotypes - locally adapted populations
From Lambers, Chapin and Pons 1998
Terms to know:
Reductionism HolismOrganismal theory of community organizationIndividualistic theory of community organizationHistorical filter Physiological filter Biotic filterMicroenvironment Liebig’s law of the minimum Law of [multiple] limiting factorsLaw of toleranceOptimal vs realized distribution (physiological vs ecological amplitude)Homeostasis Stress Stress response Acclimation Phenotypic plasticity Adaptation Stress resistance Stress tolerance Stress avoidance