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Glossary: ecological niche

February 15th, 2012 — 3:30pm

The specific position or function that an organism fills in an ecosystem.

Glossary: ecology

February 15th, 2012 — 3:30pm

Study of the interactions occurring between organisms and their environments; also used to refer directly to such relationships.

Glossary: ecophenotype

February 15th, 2012 — 3:30pm

A phenotype resulting from environmental or ecological conditions rather than genetic inheritance.

Glossary: ecosystem

February 15th, 2012 — 3:30pm

A biological community comprising interacting organisms plus their physical environment.

Glossary: ecotype

February 15th, 2012 — 3:30pm

A distinct population of a species adapted to occupy a particular habitat due to localised natural selection.

Glossary: ectoparasite

February 15th, 2012 — 3:30pm

A parasite that lives outside its host. Opposite of endoparasite.

Glossary: ectopterygoid

February 15th, 2012 — 3:30pm

A membrane, paired, bone in the upper jaw, located ventrally on the skull. Some fishes, such as serrasalmids, possess small tooth-like projections known as ectopterygoid teeth on this bone.

Glossary: eddy

February 15th, 2012 — 3:30pm

Movement of water in the opposite direction to the main current, especially in a circular fashion; a whirlpool.

Glossary: edema

February 15th, 2012 — 3:30pm

See oedema.

Glossary: egg

February 15th, 2012 — 3:30pm

Object laid by a female bird, reptile, fish, or invertebrate, normally roun or oval-shaped and containing a developing embryo surrounded by nutrient material and a protective case or shell; a female gamete; an ovum.

Glossary: egg scatterer

February 15th, 2012 — 3:30pm

A species spawning above the bottom which scatters demersal eggs randomly.

Glossary: Elasmobranchii

February 15th, 2012 — 3:30pm

Subclass of Chondrichthyes, also known as cartilaginous fishes, that includes the sharks, skates and rays.

Glossary: elasmoid scale

February 15th, 2012 — 3:30pm

Common scale-type. Found in all teleosts, and often separated into cycloid and ctenoid forms.

Glossary: electrofishing

February 15th, 2012 — 3:30pm

Method of collecting fishes that uses electricity to stun them, commonly used for sampling populations during scientific surveys. Causes no permanent harm to fishes when carried out properly.

Glossary: electrogenesis

May 31st, 2012 — 10:29am

Production of electrical impulses in living organisms or tissues.

Glossary: electrogenic

February 15th, 2012 — 3:30pm

Of or relating to production of electricity in living cells, sometimes used to in reference to fishes able to deliver an electric shock.

Glossary: electroreceptor

February 15th, 2012 — 3:30pm

Sensory organ present in some fishes. Used to detect electrical current.

Glossary: emarginate

February 15th, 2012 — 3:30pm

Having a notched margin or edge. Often used in reference to a caudal fin with a slightly concave shape.

Glossary: embryo

February 15th, 2012 — 3:30pm

A young, unborn or unhatched organism in the process of development.

Glossary: empirical

February 15th, 2012 — 3:30pm

Derived from or relating to experimental observation as opposed to theory.