Symbiosis - Key terms



COMMENSALISM:

A symbiotic rela tionship in which one organism, the commensal, benefits without causing any detriment to the other organism, the host.

FACULTATIVE:

A term for a symbiotic relationship in which partners are capable of living apart.

HOST:

The term for an organism that provides a benefit or benefits for another organism in a symbiotic relationship of commensalism or parasitism.

INQUILINISM:

A type of symbiosis in which one species, the inquiline, makes use of a host's nest or habitat without causing any detriment to the host. Inquilinism is considered a variety of commensalism.

OBLIGATIVE:

A term for a symbiotic relationship in which the partners, if they were separated, would be incapable of continuing to live.

PARASITISM:

A symbiotic relation ship in which one organism, the parasite, benefits at the expense of the other organism, the host.

SYMBIOSIS:

A biological relationship in which (usually) two species live in close proximity to one another and interact reg ularly in such a way as to benefit one or both of the organisms. Symbiosis may exist between two or more individuals of the same species as well as between two or more individuals representing two different species. The three principal varieties of symbiosis are mutualism, commensalism, and parasitism.

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