BIOL 2060 Lecture Notes - Lecture 20: Intermediate Disturbance Hypothesis, Intertidal Zone, Light Pollution
7 Mar 2018
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Document Summary
Equilibrium view: assumption of relatively constant environmental conditions, simple laboratory experiments, lotka-volterra competition model (competitive exclusion, predator-prey models (oscillations and extinctions, disease models. The paradox of diversity: competitive exclusion should over time eliminate all but the strongest competitors, hutchinson: why are there so many species, there must be a process interfering with exclusion. What is disturbance: depends on organisms and environment, organisms are adapted to average environmental conditions in their surroundings, ex. Temperature variability in temperate vs. tropical forest: ex. Salinity variation in estuary vs. coral reef: disturbance must be define relative to average conditions, ex. "any discrete event in time that disrupts population, community, or ecosystem structure and changes resources, substrate availability, or the physical environment: two major characteristics: frequency and intensity. If there is a disturbance will it benefit r or k strategy species: r-strategy is a good colonizer (significant increase then decrease, k-strategy is a good competitor (gradual increase then plateau)
