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Glossary: alien species

February 15th, 2012 — 2:05pm

See exotic species.

Glossary: alimentary canal

February 15th, 2012 — 2:05pm

The passage (including the oesophagus, stomach, and intestines when present) along which food passes through the body from mouth to anus.

Glossary: alkali

February 15th, 2012 — 2:05pm

A substance which neutralises an acid.

Glossary: alkaline

February 15th, 2012 — 2:05pm

Relating to or containing an alkali; having a pH greater than 7.0; having a relatively low concentration of hydrogen ions; able to neutralise an acid.

Glossary: alkalinity

February 22nd, 2012 — 3:56pm

Measure of the buffering capacity of a given water body, i.e.¬†its capacity to neutralize acids and bases thereby maintaining a ¬†fairly stable pH. Water containing¬†compounds, such as bicarbonates, carbonates, and hydroxides has a stronger such capacity and is referred to as hard water, while water lacking or deficient in them is termed soft water. Soft […]

Glossary: allelopathy

February 15th, 2012 — 2:05pm

A biological phenomenon by which an organism produces one or more biochemicals that affect the growth, survival, and reproduction of others. Typical in certain plants, algae, bacteria, coral, and fungi.

Glossary: allometry

February 22nd, 2014 — 9:58pm

The growth of body parts at different rates, resulting in a change of body proportions; the study of this phenomenon.

Glossary: allopatric

February 15th, 2012 — 2:05pm

Occurring in separate, nonoverlapping geographic areas. Often used to refer to geographically-separated, reproductively-isolated populations of related organisms. Opposite of sympatric.

Glossary: allopatric speciation

February 16th, 2012 — 2:55pm

Speciation event driven by some form of physical separation, e.g., the formation of new mountain ranges, followed by development of new genotypes and/or phenotypes.

Glossary: alluvial

February 15th, 2012 — 2:05pm

Refers to sediment deposited by flowing water.

Glossary: altruism

February 15th, 2012 — 2:05pm

Behaviour benefitting other individuals of the same species, whether or not they are the offspring of the individual concerned. Frequently detrimental to the individual but favouring the spread or survival of its genes.

Glossary: altruistic behaviour

February 15th, 2012 — 2:05pm

Behaviour which benefits other organisms. May be expressed at the level of the individual, group, or more extensive social system.

Glossary: ammonia

February 15th, 2012 — 2:05pm

The chemical compound NH3, which is toxic to fish. The main source in aquaria is the breakdown of protein by a fish's metabolism.

Glossary: amphibian

February 15th, 2012 — 2:05pm

A class of cold-blooded vertebrates, generally requiring water for reproduction.

Glossary: amphibious

February 15th, 2012 — 2:05pm

Living or able to live both in water and on land.

Glossary: amphidromous

November 22nd, 2012 — 11:23am

Migrating from fresh to salt water or from salt to fresh water at some stage of the life cycle other than the breeding period.

Glossary: amphidromy

February 15th, 2012 — 2:05pm

A form of diadromy in which fishes migrate between fresh and marine water as part of their life cycle for some purpose other than spawning, e.g., newly-hatched ,arvae may be swept downstream into the sea where they spend a period of time before migrating back into fresh water to mature and eventually reproduce.

Glossary: amphipod

February 15th, 2012 — 2:05pm

A crustacean of the order Amphipoda, most of which are small and have a laterally-compressed shape. The suborder Gammaridea contains all freshwater species.

Glossary: ampullae

February 15th, 2012 — 2:05pm

Used in ichthyology to describe dilations in the semicircular ear canals of some fishes.

Glossary: anadromous

February 15th, 2012 — 2:05pm

Migrating from marine to freshwater environments in order to spawn, as many salmonids do for example.