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brackish

brackish  

Applied to water that is saline, but less so than sea water. According to the Venice system, brackish waters are classified by the chlorine they contain and divided into zones. The zones, with their ...
size structure

size structure  

In a plant community, the number or proportion of individual plants falling within particular size ranges (e.g. of forest trees with girths of less than 1 m, 1.0–1.5 m, 1.6–2.0 m, 2.1–2.5 m, etc.). ...
Dictyostelium

Dictyostelium  

(class Dictyosteliomycetes)A genus of cellular slime moulds; D. discoideum has been studied particularly as a model differentiation system. In this species, the slug-like pseudoplasmodium varies in ...
Phallales

Phallales  

(class Gasteromycetes)An order of fungi in which the fruit body begins its development underground. It begins as a more or less spherical ‘egg’ stage, 0.5–5.0 cm in diameter, with a smooth, ...
Hypoxylon

Hypoxylon  

(order Sphaeriales)A genus of fungi, in which the fruit body consists of a stroma in which perithecia are embedded. The fruit body is hard and dark-coloured and is often hemispherical but may be ...
dry-subhumid climate

dry-subhumid climate  

A climate with an aridity index of 0.50–0.65.
neurosecretory spheres

neurosecretory spheres  

Electron-dense spheres 0.1–0.2 micrometers in diameter, synthesized by and transported in the axoplasm of specialized neurons.
Enteromorpha

Enteromorpha  

(division Chlorophyta)A genus of macroscopic green algae in which the thallus consists of elongated, hollow, tubular fronds with walls only one cell thick. The fronds may be simple or branched. The ...
Sphacelariales

Sphacelariales  

(division Phaeophyta)An order of brown algae in which growth occurs from a large, dense, brown, apical, meristematic cell. This cell divides transversely, and then the daughter cells divide ...
Cladoselache

Cladoselache  

Late Devonian, shark-like fish recorded from Europe and N. America. Cladoselache ranged between 0.5 and 1.2 m in length and is noted for the presence of a large ventral fin. Numerous specimens of ...
Artocarpus

Artocarpus  

(family Moraceae)A genus of small to medium trees that yield latex from the bark and useful timber. The leaves have big stipules and are commonly divided. Male flowers are borne in catkins, female ...
Triodia

Triodia  

(family Poaceae)A genus of coarse grasses that are similar in superficial appearance to Spinifex and are commonly known as such. They form tussocks, usually 50 cm in height and 0.5–1 m wide. The ...
calcareous soil

calcareous soil  

Soil that contains enough free calcium carbonate to effervesce visibly, releasing carbon dioxide gas, when treated with cold 0.1 N hydrochloric acid, and which could also be regarded as an alkaline ...
available water

available water  

In soil, the water that can be absorbed readily by plant roots. It is usually taken to be water held in the soil under a pressure of 0.3 to about 15 bars.
alkaliphile

alkaliphile  

An extremophile (domain Archaea) that thrives in environments where the pH is above 9.0.
saline-sodic soil

saline-sodic soil  

Soil that contains more than 15 per cent exchangeable sodium, a saturation extract with a conductivity of more than 0.4 siemens per metre (4 mmhos/cm) (25°C) and in the saturated soil usually has a ...
similarity coefficient

similarity coefficient  

Any measure of the similarity of two samples. In ecological work, the similarity index devised in 1913 by J. Czekanowki has been widely used. This measures similarity as C = 2W/(a + b), where a and b ...
polymorphic locus

polymorphic locus  

A genetic locus, in a population, at which the most common allele has a frequency less than 0.95. Compare with monomorphic locus.
hyper-arid

hyper-arid  

Applied to a climate with an aridity index of less than 0.05.
Pauropoda

Pauropoda  

(phylum Arthropoda, subphylum Atelocerata)A class of small (0.5–2.0 mm long), soft-bodied animals resembling millipedes. There are usually 11 segments of which nine bear legs, the first and last ...

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