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BIO 182
Chapter 53 Population Ecology
Term | Definition |
---|---|
Population Ecology | Study of the ecosystem |
Name the three ways organisms respond to environmental change: | 1. Physiology- 2. Morphology 3. Behavior |
Physiology | The changes that occur inside their body |
Morphology | The changes that occur outside the body |
Behavior | Changes in behavior due to the envirement (hibernation) |
Population dynamics Two types | 1. Immigration 2. Emigration |
Population Dynamics Immigration | Will add to population (birth) |
Population Dynamics Emigration | Will take way from population (death) |
Two characters associated in population | density and dispersion |
Associated in population: density | the number of individuals per unit of area or volume |
Two types of density associated in population | 1. indirect way: counting by nests or burrows 2. Mark: Recapture method: (See notes) |
Dispersion associated with population three types | 1. Clumped distribution 2. Uniform distribution 3. Random distribution |
Clumped | individuals of a species together with limited space between eachother Reason: attraction food and attraction to one another |
Uniform | Individuals of species evenly spread: Reason Repulsion |
Randomly | It is neither clumped or uniformed No attraction or repulsion |
Survivorship curve | Measures mortality rate of different species |
Survivorship curve Type 1 | Low death rates during early and middle life than increase among older age groups (humans) |
Survivorship curve Type 2 | the death rate is constant over the organisms life span (squirrels ) |
Survivorship curve Type 3 | high death rates for young then a slower death rate for survivors (sea turtles) |
Reproductive rate | at certain age a single organism has a high reproductive rate |
Big bang reproductive: Semelparity | is a one time reproduction (black widow) |
Repeated reproduction : iteropartiy | is a repeated reproduction |
Carrying capacity | The maximum level a population can reach before it declines |
Exponential growth | the population expands greatly due to the amount of space and food |
K-Selected population: Carrying capacity | 1. Will not reproduce alot throughout lifespan 2. Longer lifespan 3. Longer parental care 4. low death rate |
R-Selected population: Reproduction | 1. will reproduce alot throughout lifespan 2. short life span 3. no parental care 4. high death rate |