Sanasto (englanti)

[also Invasive species, Non-indigenous species, Exotics] An alien species is a species that does not naturally occur in a specific area. Also "Alien species" means, with respect to a particular ecosystem, any species, including its seeds, eggs, spores, or other biological material capable of propagating that species, that is not native to that ecosystem. Alien species are often harmful to ecosystem, but exceptions occur (e.g. genus Marenzelleria in the Baltic Sea).

The species diversity measured at the local scale comparing two sitesfrom different bioregions. See also Biodiversity.

Organism, tissue or process that requires the absence of oxygen or is not dependent of oxygen. See also Aerobic

Deposited during the Baltic Sea phase Ancylus Lake. Is typically gray clay with black sulphide bearing intervals.

A large freshwater lake that formed in the Baltic Sea Basin between Yoldia and Litorina phases about 10800 and 8000 cal. years ago.

The angle attained on a slope comprised of unconsolidated sediments after avalanching, typically around 30–40o for quartz sand, depending on porosity and packing.The angle of repose is common in nature, occurring on the lee sides of migrating bedforms and among continental slope sediment deposits.

Organism that completes its whole life cycle within year.

(1) A condition in which oxygen is completely absent or depleted. (2) Severe hypoxia; lack of oxygen supply, e.g. to a body organ or tissue.

Environment or condition lacking oxygen. See also Hypoxia.

An area where the oxygen content of near-bottom water is low.