Spencer Ecology Quiz 2

30 terms by jdspence

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Symbiosis

Relationship in which two species live closely together

Types of Symbiosis

Mutualism, Commensalism, Parasitism and Predation

Mutualism

Both benefit and are dependent on each other

Commensalism

One benefits and the other is neither helped nor harmed

Predation

One benefits and the other is killed

Predator

The organism that is the hunter

Prey

The organism that is being hunted

Parasitism

One benefits and the other is harmed

Parasite

Orgnaism that grows, feeds and is shelterd in or on a different organism while contributing nothing to the survival of its host

Endoparasite

Internal parasite (Ex: Tape worm, round worm)

Ectoparasite

External parasite (Ex: Leech, tick, mosquitoe)

Food Chain

Series of organisms in which each eats or decomposes the preceding one

Food Web

Complex network of many interconnected food chains and feeding relationships

Trophic Levels

All organism that are the smae number of energy transfers away from the original source of energy (Sunlight) that enters an ecosystem

10%

The amound of usable energy entering one trophic level transferred to the organism at the next trophic level

Arrows

Represent a transfer of energy

Example of Food Chain

Example of Food Web

Pyramid of Energy Flow

Diagram reprsenting the flow of energy through each trophic level

Water Cycle

Biogeochemical cycle that collects, purifies and distributes the earth's supply of water from teh envrionment to living organism then back to the environment

Carbon Cycle

Biogeochemical cycle that depends on photosynthesis and respiration

Nitrogen Cycle

Biogeochemical cycle that relies heavily on bacteria

Phosphorus Cycle

Biogeochemical cycle that depends on the weathering of rocks

Biotic Potential

A populations capacity for growth ( ex: favorable temperature, adequate food supply)

Environmental Resistance

Factors that act to limit the populations capacity for growth (ex: not enough food, temperature too low or high)

3 Factors that change population size

Birth, Death and Migration (Immigration and Emigration)

Carrying Capacity

The maximum number of individuals of a given speices that can be sustained in a given space

Dieback

A sharp reduction in the population of a speices when its number exceeds the carrying capacity

Density Dependent factors

Affects population when the population is very dense (Predation and disease)

Density Independent factors

Affects the population's size regardless of its density (Floods, hurricanes)

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