Glossary of ALL Terms for Data on EOL


oak woodland
An oak woodland is a woodland which has a tree community primarily composed of oak trees.
obligate climber
obligate epiphyte
obligate parasite
obligate parasite
parasitic organism that cannot complete its life-cycle without exploiting a suitable host
obligate parasite
parasitic organism that cannot complete its life-cycle without exploiting a suitable host
occurrence ID
An identifier for the Occurrence (as opposed to a particular digital record of the occurrence). In the absence of a persistent global unique identifier, construct one from a combination of identifiers in the record that will most closely make the occurrenceID globally unique.
occurrence remarks
Comments or notes about the Occurrence.
Oceanian realm (islands)
The Oceanian realm is one of the World Wildlife Fund-WWF biogeographic realms, and is unique in not including any continental land mass. It includes the islands of the Pacific Ocean in: Micronesia, the Fijian Islands, the Hawaiian islands, and Polynesia (with the exception of New Zealand).
oceanic bathypelagic zone
The bathypelagic zone biome comprises the marine water column below approximately 1000 m water depth - the maximum depth to which detectable daylight penetrates in all but the clearest oligotrophic waters - and extends to about 2500 - 2700 m water depth. In the temperate Atlantic, the beginning of the bathypelagic zone biome approximates to the deep oxygen minimum and the base of the permanent thermocline.
oceanic benthopelagic zone
The benthopelagic zone biome comprises regions of the marine water column which usually coincide with the benthic boundary layer (BBL) - the layer of isothermal and isohaline water contiguous to the sea floor. A general reversal in the declining gradient of pelagic biomass may be observed here, perhaps explained by viable nutrition on the sea floor being resuspended by bottom currents. This zone typically extends 100 m above the seafloor, but may reach upto1000 m during benthic storms.
oceanic front
An oceanic front is a narrow zone of enhanced horizontal gradients of water properties (temperature, salinity, nutrients, etc.) that separates broader areas with different water masses or different vertical structure (stratification).
oceanic island
An island that does not sit on a continental shelf, and is of volcanic origin.
oceanic pelagic zone
The oceanic epipelagic zone biome comprises the marine water column offshore, beyond a continental shelf.
oceanic zone
The water mass of an ocean that is not above a continental shelf.
An oceanodromous fish, like an anadromous or catadromous fish, is migratory. Unlike anadromous or catadromous fish, an oceanodromous fish spends its whole life in salt water.
small simple eyes, found in many invertebrates, usually consisting of a few sensory cells and a single lens
octadecanoic acid
of special concern
may become threatened or endangered because of a combination of biological characteristics and identified threats
oil palm plantation
olenekian age
International Chronostratigraphic Chart:
oligocene epoch
International Chronostratigraphic Chart:
oligotrophic freshwater lake
oligotrophic water
Water with a very low nutrient level.
olive grove
existing in every direction
organism consuming a variety of foods, usually including both plants and animals
Crustacean body sizes
An omnivorous animal that usually or preferentially feeds on animals
An omnivorous animal that usually or preferentially feeds on plants
onset of fertility
The age at which an organism develops the ability to produce live offspring.
Zygote, specifically a sporozoan zygote undergoing sporogenous development.
open-ended ventilator
In open-ended ventilation the burrows are U-shaped and can be flushed easily from one end to the other
optimal growth pH
The pH of a medium (water column, soil moisture) at which the growth rate of an organism is typically optimized
optimal growth temperature
Optimal temperature conditions for cell division
Created by Anne Thessen
optimal rainfall
rainfall required for survival and growth
A color hue with high-medium wavelength that of that portion of the visible spectrum lying between red and yellow, evoked in the human observer by radiant energy with wavelengths of approximately 585 to 620 nanometers.
[database_cross_reference: Wikipedia:]
An intentional planting of trees or shrubs maintained for food, typically fruit, production.
orchard soil
Soil in which trees from an orchard grow.
ordovician period
International Chronostratigraphic Chart:
organ system
anatomical structure that consists of organs and organ subclasses responsible for certain body functions
organic material
Environmental material characteristic of, pertaining to, or derived from living organisms.
organic matter fall
An accumulation of organic matter that has fallen to the bottom of a body of water.
organic waste
waste containing mostly natural organic materials; remains of plants, animal excrement, biological sludge, and so forth
A spatial quality inhering in a bearer by virtue of the bearer's placement which is defined by the angle between the bearer and an axis, or another object
origin of toxin
Toxin found in an organism may be biosynthesized by that organism, accumulated from a dietary source, borrowed from a microbial symbiont, etc...
original material
Part of the material collected from the occurence from which the taxon was first defined
cultivated for decorative purposes
A surface feature shape quality inhering in a bearer by virtue of the degree of the bearer's highly topographical with ridges, pits, rugosity or other surface structures
uptake of dissolved organic compounds by osmosis for nutrition
ostraciiform swimming
Body/caudal fin propulsion, with no appreciable body wave when they employ caudal locomotion. Only the tail fin itself oscillates (often very rapidly) to create thrust. Typical of the Ostraciidae
Bud sources other than epicormic buds, apex, root crown, lignotuber, burl, rhizome, roots or storage organs, including those not clearly specified (e.g., stump).
Inner-ear structure in vertebrates which detects acceleration and may detect acoustic signals
outer ear length
External ear (pinna) length is a standard measurement in mammalogy, usually measured in a living mammal or a fresh mammal carcass. External ear length is measured from the base of the notch at the bottom of the ear to the apex (highest point) of the ear.
Kristofer Helgen
outer reef
outwash fan
A fan-shaped body of sediments deposited by braided streams from a melting glacier.
Egg-shaped; a spheroid quality inhering in a bearer by virtue of the bearer's exhibiting a continuous convex surface with an axis of symmetry and one axis longer than the other.
overlapping (imbricate)
positioned over another entity so as to cover some portion of it
The capability of producing eggs (OVA) from which young are hatched outside the body. While mostly referring to nonmammalian species, this does include MAMMALS of the order MONOTREMATA.
a consumer that that feeds on unhatched eggs
oxbow lake
A lake which is formed when a wide meander from a stream or a river is cut off to form a lake. They are called oxbow lakes due to the distinctive curved shape that results from this process.
Monaxon (diactinal) spicule pointed at both ends (a-m in figure). Different types are distinguished by shape and tip morphology. Shape may be fusiform (a), angulate (b), centrotylote (c), curved (d), or flexuous (e). Tips may be acerate (f), asymmetrical (g), blunt (h), conical (i), hastate (j), mucronate (k), stepped (1), or symmetrical (m).
oxfordian age
International Chronostratigraphic Chart:
molecular oxygen, O2
oyster reef
rock-like reef, composed of dense aggregations of oysters in large colonial communities, which provides habitat for juvenile oysters, other marine animals and plants
An ounce (abbreviated oz) is usually the international avoirdupois ounce as used in the United States customary and British imperial systems, which is equal to one sixteenth of a pound or approximately 28 grams.