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a

Overview page. Subjects: Ecology and Conservation.

The usual abbreviation for year (from the Latin annus, meaning year).

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Aapa mires

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

Fens, sometimes called ‘string bogs’, of circumpolar distribution, found in northern Scandinavia and boreal Canada. They are soligenous mires with ridges arranged roughly normal to the...

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abaptation

Overview page. Subjects: Ecology and Conservation — Zoology and Animal Sciences.

The process by which an organism is fitted to its environment as a consequence of the characters it inherits, which have been filtered by natural selection in previous environments. Because...

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abaxial

Overview page. Subjects: Ecology and Conservation — Plant Sciences and Forestry.

Of a plant organ, facing away from the axis or main stem (e.g. the lower surface of leaves). Compare adaxial.

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absolute age

Overview page. Subjects: Ecology and Conservation.

The age of a geologic phenomenon measured in present Earth years, rather than its age relative to other geologic phenomena (compare relative age). The term ‘absolute age’ has been...

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absolute pollen frequency

Overview page. Subjects: Ecology and Conservation — Plant Sciences and Forestry.

(APF)

The expression of pollen data from sediments in terms of the absolute numbers (for each species, genus, or family) per unit area of surface and, where deposition rates are...

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absorption

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

The uptake of substances, usually nutrients, water, or light, by cells or tissues.

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abyssal

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

Applied to the deepest part of the ocean, below about 2000 m. The abyssal zone covers approximately 75% of the ocean floor. Compare bathyal; neritic.

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abyssal fish

Overview page. Subjects: Zoology and Animal Sciences — Ecology and Conservation.

Fish that live in the deepest part of the ocean, below about 2000m. Many abyssal species have prominent snouts; a tapering, rat-tailed body consisting of flabby, watery tissue; and a...

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abyssalpelagic zone

Overview page. Subjects: Ecology and Conservation.

The part of the pelagic zone of the ocean that overlies the abyssal plain. It extends from a depth of between 2000m and 4000m to about 6000m. The temperature is about 4°C and the pressure...

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