In: Social Issues

Submitted By fajardo
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Density-dependent factor - one whose influence on population dynamics is proportional to population density, eg., competition for food
Density-independent factor - one whose influence on population dynamics is not related to population density, eg., prolonged drought, late frost
Density legislative factor - one that exerts its influence indirectly, by affecting the supply of food or some other resource, eg., drought decreases food, wind storm increases supply of fallen trees
Density-governing factor - a factor that regulates a population, that is, that acts as a negative feedback to keep the population at or close to a particular density
I. Review of exponential growth and logistic growth
II. Are populations "regulated?" i.e., do they: remain at or near carrying capacity? avoid acute shortage of resources?
A. Weather
1.Weather directly influences growth rates and survival
2.Weather affects supply of food and shelter
3.Weather catastrophes increase mortality
B. Space
1. Shelter, refuge, and nesting/denning sites
2. Sessile organisms often space-limited plants - self-thinning barnacles C. Food (energy/nutrients)
D. Climate/space/food - the basic components of habitat
Amount of suitable habitat the basic determinant of abundance
IV. REGULATION - NEGATIVE FEEDBACK - Density Governing Factors
A. Must be a DENSITY-DEPENDENT FACTOR Analogy to thermostat - In a thermostat, the analogous factor would be the temperature-dependent bimetallic strip which moves the on-off switch
1. PREDATION may keep populations below the carrying capacity (K). In many cases though, predation…...

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