Glossary of ALL Terms for Data on EOL


A dairy food product has mammilian milk or a milk component as an ingredient.
dairy (microbial habitat)
A class of complex shallow wetlands in central, southern and eastern Africa, particularly in Zambia and Zimbabwe. They are generally found in higher rainfall flat plateau areas, and have river-like branching forms which may be nowhere very large, but common enough to add up to a large area.
danian age
International Chronostratigraphic Chart:
dapingian age
International Chronostratigraphic Chart:
darriwilian age
International Chronostratigraphic Chart:
data deficient
A taxon is Data Deficient when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. A taxon in this category may be well studied, and its biology well known, but appropriate data on abundance and/or distribution are lacking. Data Deficient is therefore \r\nnot a category of threat. Listing of taxa in this category indicates that more information is \r\nrequired and acknowledges the possibility that future research will show that threatened \r\nclassification is appropriate. It is important to make positive use of whatever data are available. In many cases great care should be exercised in choosing between DD and a threatened status. If the range of a taxon is suspected to be relatively circumscribed, and a considerable period of time has elapsed since the last record of the taxon, threatened status may well be justified.
The integer day of the month on which the Event occurred.
day length
time duration between sunrise and sunset.
A day is a unit of time. In common usage, it is an interval equal to 24 hours.[1] It also can mean the consecutive period of time during which the Sun is above the horizon of a location, also known as daytime. (Wikipedia:
decibels; 1/10th of a bel, a relative unit of amplitude or power. Commonly used in acoustics as a unit of sound pressure level, relative to the standard reference sound pressure of 20 micropascals in air or 1 micropascal in water.
a state resulting from the cessation of the bearer's life
decanoic acid
decapod feeder
a carnivore that feeds primarily on decapods
order of crustaceans
Deciduous (plant): A quality inhering in a plant by virtue of the bearer's disposition to shed foliage.
deciduous forest
a forest in which the majority of trees shed foliage simultaneously in response to seasonal change.
decreased quality
A quality that has a value that is decreased compared to normal or average
A positional quality inhering in a bearer by virtue of the bearer's lying or growing on the ground but with erect or rising tips.
consisting of paired parts that alternately cross each other
deep infaunal
Benthic organism that lives deep within unlithified (soft) substrate.
deep marine sediment
sediment that accumulates in the flat or very gently sloping areas of the deep ocean basin floor. The three main types are siliceous oozes, calcareous oozes, and red clays.
A plane angle unit which is equal to 1/360 of a full rotation or 1.7453310^[-2] rad.
degrees celsius
A small wooded valley, either U- or V-shaped.
A tract of alluvium formed at the mouth of a river where the deposition ofsome of its load exceeds its rate of removal, crossed by the divergent channels (distributaries) of the river.
dense settlement biome
A dense settlement biome is an anthropogenic terrestrial biome which is primarily used for human habitation, recreation, and industry within built structures with little other land use.
Pertaining to a tooth or teeth, or to odontology.
deposit feeder
an organism that eats particulate organic material in or on sediments.
deposit feeder
Any organism which feeds on fragmented particulate organic matter from the substratum
A landform sunken or depressed below the surrounding area.
described accepted species
number of currently described and taxonomically accepted marine species in this clade (Appeltans et al. 2012. The Magnitude of Global Marine Species Diversity. Current Biology 22, 2189–2202.
A desert biome is a terrestrial biome which loses more liquid water by evapotranspiration than is supplied by precipitation and includes communities adapted to these conditions.
desert and xeric shrubland
desert oasis
A small, isolated, fertile or green area in a desert region, usually having a spring or well.
desert sand
desert scrubland
A scrubland which is located in a desert.
determinate growth
determinate growth stops once a genetically pre-determined structure has completely formed
organism that obtains nutrients by consuming detritus
dead particulate organic material
developmental mode
Broad recognized categories describing development, the process by which organisms grow and mature
devonian period
International Chronostratigraphic Chart:
decigram; a unit of mass equal to ten grams
Two types of males, namely, primary males and secondary males coexist in diandric protogynous fishes. Secondary males are derived from females through sex change, i.e. they are protogynous hermaphrodites. In contrast, primary males are considered to be born males and do not change sex. Both young primary males (Initial Phase) and females may mature into Terminal Phase males, which have breeding priority.
Kuwamura, T., Suzuki, S., Tanaka, N., Ouchi, E., Karino, K. and Nakashima, Y. (2007), Sex change of primary males in a diandric labrid Halichoeres trimaculatus: coexistence of protandry and protogyny within a species. Journal of Fish Biology, 70: 1898-1906. doi:10.1111/j.1095-8649.2007.01464.x
Life stage(s) at which diapause can occur. (
diatom feeder
a consumer that feeds primarily on diatoms
a class of algae
diel vertical migration
A pattern of movement used by some organisms, such as Copepods, living in the ocean and in lakes. The migration occurs when organisms move up to the epipelagic zone at night and return to the mesopelagic zone of the oceans or to the hypolimnion zone of lakes during the day
diet breadth
Number of dietary categories eaten by an organism.
diet includes
Information about the items eaten by this organism.
digestive system
includes the esophagus, stomach, small and large intestine, anus, liver, biliary tract, and pancreas.
having distinct parts arising from a common point or center.
animal that stands or walks on the full length of its digits/toes
dimethyl sulfide
A methyl sulfide in which the sulfur atom is substituted by two methyl groups.
a characteristic of a species, meaning that it has distinct male and female individual organisms.
In the haploid (gametophyte) lifestage of a moss or fern, the antheridia (male) and archegonia (female) reproductive organs occur on different individual plants
A physical quality inhering in a bearer by virtue of the bearer's orientation in space
disc diameter
dispersal age
Age at which young permanently leave the parent, parental group, social group or any associated territories.
A stream that branches off and flows away from a main stream channel. They are a common feature of river deltas.
A small artificial watercourse dug for draining or irrigating the land.
animal behavior characterized by activity during the day, with a period of inactivity at night.
docosanoic acid
dodecanoic acid
A closed depression draining underground in karst, ofsimple but variable form, e.g. cylindrical, conical, bowl- or dish-shaped. From a few to many hundreds of metres in dimensions.
domesticated in
Location where this organism was originally domesticated
Pertaining to the back or upper surface of the body; opposite of ventral.
dorsal fin swimming
swimming mainly using undulations of the dorsal fin
dorso-ventral undulatory swimming
swimming by generating thrust using dorso-ventral undulations of the body.
Of or involving the back and belly of the main body.
downward conveyor
Downward conveyors exhibit a feeding strategy opposite to that of upward conveyors. Vertically oriented head-up feeders actively select and ingest particles at the surface and egest these non-locally as faeces in deeper sediment strata
wood-like secondary growth found in monocots, supporting tree growth forms, as in the genus Dracaena, the Dragon Trees
draft animal
A role that inheres in an animal that is kept by humans and trained to perform tasks.
drag powered swimming
Drag swimmers use a cyclic motion where they push water back in a power stroke, and return their limb forward in the return or recovery stroke. When they push water directly backwards, this moves their body forward, but as they return their limbs to the starting position, they push water forward, which will thus pull them back to some degree, and so opposes the direction that the body is heading. This opposing force is called drag. The return-stroke drag causes drag swimmers to employ different strategies than lift swimmers. Reducing drag on the return stroke is essential for optimizing efficiency.
drainage canal
Artificial watercourse with no flow or a controlled flow used drainage.
drainage ditch
A ditch that collects water from the surrounding land.
drought semi-deciduous
A plant that drops part of its leaves during the dry period (excluding species that exceptionally drop leaves in very dry periods)
drought tolerance
Becoming tolerant to drought like conditions of minimal or no water content in the growth environment
drumian age
International Chronostratigraphic Chart:
An elongated whale-shaped hill formed by glacial action. Its long axis is parallel with the movement of the ice, with the blunter end facing into the glacial movement. Drumlins are sometimes compared to kames, but their formation is distinctively different.
a fruit which develops from a carpel and at maturity comprises a fleshy exocarp, a fleshy mesocarp, and a stony endocarp
dry body mass
dry forest
dry fruit
A fruit that lacks succulent tissue at maturity.
dry lake
A lake that has either permanently or temporally lost its water.
dry lake bed
The bed of a dry lake.
dry mass
dry river
A river that has either permanently or temporally lost its water.
dry river valley
dry soil
dry stream
A stream that has either permanently or temporally lost its water.
dry valley
A valley that no longer has a surface flow of water. Typically found in either Karst (limestone) or chalk terrain.
A hill of sand built by eolian processes.
dune slack
A valley or trough between two dunes.
dune soil
monoecious (separate male and female flowers are always found on the same plant) with sequential cohorts of flowers, alternating sex in a sequence of male, then female, then male flowers
de Lima, H.A., Somner, G.V. & Giulietti, A.M. Duodichogamy and sex lability in Sapindaceae: the case of Paullinia weinmanniifolia . Plant Syst Evol 302, 109–120 (2016).
duration of illness
Length of the period during which symptoms manifest.
an organism that eats hard-shelled or exoskeleton bearing organisms, such as corals, shelled mollusks, or crabs.
Minute solid particles with diameters less than 500 micrometers. Occurs in and may be deposited from, the atmosphere.
dwarf males
sexual dimorphism where the body of the male is reduced- smaller than the female and sometimes simplified.
colorant, tincture. Product meant for imparting color
dystrophic montane freshwater lake