Interactions between organisms in the Environment

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Competition

a relationship that occurs when two or more organisms need the same resource at the same time

Symbiosis

a symbiotic relationship exists between organisms of two different species that live together in direct contact

Commensalism

a symbiotic relationship in which one organism benefits and the organism is not affected

Parasitism

a symbiotic relationship in which one organism benefits at the expense of the other organism (the host)

physical control for invasive species

barriers to prevent species from entering an area or physically removing species

Mutualism

is a symbiotic relationship in which both organisms benefit

Predation

is an interaction between species in which one species hunts, kills, and eats the other

Permeability

Ability of rock or soil to allow water to flow through it

Niche

An organism's particular role in an ecosystem, or how it makes its living.

Biotic

Describes living factors in the environment.

Soil particle size

Gravel, sand, silt, clay

carrying capacity

Largest number of individuals of a population that a environment can support

Emigration

Migration from a location

Immigration

Migration to a new location

abiotic factors

Nonliving components of environment.

population density

Number of individuals per unit area

subsoil

The layer of soil beneath the topsoil that contains mostly clay and other minerals.

bedrock

The solid layer of rock beneath the soil

Soil layers (top to bottom)

Topsoil, subsoil, parent material, bedrock

Chemical control for invasive species

applying poisons to eliminate new species

Humus

material formed from decaying leaves and other organic matter

invasive species

species that enter new ecosystems and multiply, harming native species and their habitats

parent material

the rock material from which the inorganic components of a soil are derived

topsoil

the top layer of soil

Biological control for invasive species

uses living organisms to reduce or eliminate invasive species.


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