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a

a   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

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

Aapa mires

Aapa mires   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

*Fens, sometimes called ‘string bogs’, of circumpolar distribution, found in Fennoscandia (see Baltic Shield) and *boreal...

abaptation

abaptation   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

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

abaxial

abaxial   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

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

abiogenesis

abiogenesis   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
The development of living organisms from non-living matter, as in the supposed origin of life on Earth, or in the concept of spontaneous generation which was once held to account for the ... More
abiotic

abiotic   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Non-living; devoid of life. Compare biotic.

ablation

ablation   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
1 Removal of snow and ice by melting and by direct alteration from the solid to the gaseous phase (sublimation). The rate of loss is controlled chiefly by air temperature, ... More
abrasion

abrasion   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The erosive (see erosion) action that occurs when rock particles of varying sizes are dragged over or hurled against a surface. Some common agents of abrasion are the ...

abscission

abscission   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The rejection of plant organs (e.g. of leaves in autumn). This occurs at an abscission zone, where hydrolytic (see...

absolute age

absolute age   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The age of a geologic phenomenon measured in present Earth years, rather than its age relative to other geologic phenomena (...

absolute pollen frequency

absolute pollen frequency   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
The reporting of *pollen data from sediments, expressed in terms of the absolute numbers of pollen grains (for each species, genus, or family) per unit of area of surface and, where ... More
absorption

absorption   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

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

absorption spectrum

absorption spectrum   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

A graph that shows the percentage of each wavelength of light absorbed by a pigment (e.g. chlorophyll, which absorbs mainly in the red and blue parts of the spectrum)....

abstraction

abstraction   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The artificial removal of water from a well, reservoir, or river.

abyssal

abyssal   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Applied to the deepest part of the ocean, at depths between about 3000 m and 6000 m (see ocean divisions...

abyssal fish

abyssal fish   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
Fish that live in the deepest part of the ocean, below about 2000 m. Many abyssal species have prominent snouts; a tapering, rat-tailed body consisting of flabby, watery tissue; and a ... More
abyssalpelagic zone

abyssalpelagic zone   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
The part of the *pelagic zone of the ocean that overlies the *abyssal plain. It extends from a depth of between 2000 m and 4000 m to about 6000 m. The temperature is about 4°C and the ... More
abyssal plain

abyssal plain   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

An extensive, level area of the *abyssal zone, lying between the edge of a *continental rise and a mid-oceanic ...

Acanthocephala

Acanthocephala   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
A phylum of bilaterally symmetrical, worm-like organisms most of which do not have an excretory system; all lack a gut. A retractable proboscis is present, covered with the recurved spines ... More
acaricide

acaricide   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

A pesticide used to kill mites and ticks (subclass Acari).

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