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Radon concentration at the shores of large oceans is typically 1 Bq/m 3. Radon trace concentration above oceans or in Antarctica can be lower than 0.1 Bq/m 3, [100] with changes in radon levels being used to track foreign pollutants. [101] 10: 0.27 Mean continental concentration in the open air: 10 to 30 Bq/m 3.
Radon is responsible for the majority of public exposure to ionizing radiation. It is often the single largest contributor to an individual's background radiation dose, and is the most variable from location to location. Radon gas from natural sources can accumulate in buildings, especially in confined areas such as attics and basements.
The common name of these fish is related to their bizarre, tubular eyes. The genus name Gigantura refers to the Gigantes , a race of giants in Greek mythology —coupled with the suffix oura , meaning 'tail', thus Gigantura refers to the greatly elongated, ribbon-like lower half of the tailfin that may comprise over half of the total body length.
Parasitic infections from freshwater fish are a serious problem in some parts of the world, particularly Southeast Asia. Fish that spend part of their life cycle in salt water, like salmon, can also be a problem. A study in Seattle, Washington showed that 100% of wild salmon had roundworm larvae capable of infecting people.
A heavy infection will result in the fish's death, and as the fungus continues to grow afterward, dead fish that are largely covered in the white "fur" can occasionally be found washed ashore. [5] A real species of fish, Mirapinna esau , is known for the numerous hairlike structures on its body.
Oneirodidae was first proposed as a family in 1879 by the American biologist Theodore Gill [1] with Oneirodes as its only genus. [2] Oneirodes had been proposed as a monospecific genus in 1871 by the Danish zoologist Christian Frederik Lütken when he described O. eschrichtii, giving its type locality as off the western coast of Greenland. [3]
During winter, bears may lose up to a third of their body weight, so starting out very fat is essential for survival, especially in the northernmost areas. (Bears in temperate climates do not ...
They are found circumglobally, in tropical and temperate latitudes (65° N to 40° S) at depths of 600–3,500 m in the aphotic zone, where water temperatures range between 4 and 3 °C. [6] The energy-poor ecosystem dictates low population densities. Along the Mid-Atlantic Bight, a density of 0–8 fish per 25 x 10 3 m 2 has been reported. [5]