- Industry: Government
- Number of terms: 30456
- Number of blossaries: 0
- Company Profile:
NOAA Coral Reef Conservation Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
An air sac located in the coelomic cavity of many fishes. In some fishes it may retain a tubular connexion with the pharynx or esophagus; also known as a gas bladder or swim bladder, it functions variously as a hydrostatic organ, a sound conductor, a sound production organ, and in respiration. It is absent in sharks and rays, and some bony fishes.
Industry:Natural environment
An organism which must consume other organisms (living or dead) in order to satisfy its energy needs.
Industry:Natural environment
Contamination of water resources by excessive inputs of nutrients. In surface waters, excess algal production is a major concern.
Industry:Natural environment
In correspondence or communicated in writing; used for an unpublished source of information (in litteris).
Industry:Natural environment
Photographs taken from an aircraft or satellite utilised to interpret environmental conditions and geographic features.
Industry:Natural environment
The absolute abundance of an isotope is difficult to measure with accuracy. Therefore, we compare isotopic ratios in a sample with those in a standard resulting in the delta-notation: d(x) = ((Rx - Rst)/Rst) x 103, where d(x) is the delta-value of a sample, Rx and Rst are the isotopic ratios in sample (Rx) & standard (Rst). The d-value is the relative difference in the isotopic ratio of the sample and the standard. It is expressed in part per mille (o/oo); that is why the right-hand side of the equation is multiplied by 103 (1000). Carbon and oxygen data from carbonates are usually referred to the PDB standard (a belemnite, Belemnitella americana, from the Late Cretaceous peedee Formation in South Carolina).
Industry:Natural environment
The gradual variation, in a character of a species, in geographical space.
Industry:Natural environment
The depth at which a Secchi disc disappears from view as it is lowered in water Secchi disc a white disc 20-30 cm in diameter, used as a qualitative way of measuring water clarity. It is lowered from a vessel and viewed from above the surface in full solar illumination to estimate the light attenuation in the water column. This is done empirically by relating the depth at which the disc disappears to the attenuation of light.
Industry:Natural environment
