Glossary (eng)

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The term in English	The term in Russian	The term in the Estonian	The term in Finnish	Term article
Periphyton	Перифитон (также обрастание)	Pealiskasv, perifüüton	Perifyton	(also Fouling) Species (microorganisms, animals and plants) associated with hard substates (either natural or artificial). Formation of fouling occurs to start from macromolecular layer and to end with colonization by free-living stages of plants and benthic animals. Sessile animals and plants form the nucleus of this association.
pH	pH (водородный показатель)	pH	pH	A measure of acidity or alkalinity. Numbers below 7.0 are acidic, above alkaline and pH 7.0 is neutral. However, pH 4 is ten times more acidic than pH 5 and 100 times more acidic than pH 6.
Phanerogam	Цветковые растения	Seemnetaimed	Siemenkasvi	Plants that produce seeds (also known as spermatophytes).
Phanerogam meadow	Заросли погруженной высшей водной растительности («подводные луга»)	Veealused niidud	Vedenalainen niitty	Extended or patchy areas of seagrass, characteristic of shallow, tropicalto temperate seas. Meadows are usually dominated by eelgrass Zostera marina in the Baltic Sea but among Zostera patches several other phanerogam species coexist, such as members from genera Zannichellia, Ruppia and Potamogeton. In the Eastern GoF the meadows are usually formed by other vascular plants (Zannichellia, Ruppia, Potamogeton species) due to low salinity. Also known as underwater meadow.
Photic zone	Фотическая зона (эвфотическая зона)	Valgusvöönd, eufootne vöönd	Veden valoisa kerros	See Euphotic zone
Physiognomy	Физиогномия, внешний вид	Füsiognoomika	Fysionomia	The apparent characteristics, outward features, or appearance of ecological communities.
Phytoplankton	Фитопланктон	Fütoplankton, taimhõljum	Kasviplankton	Very small or microscopic free-floating algae that drift in sunlit surface waters.
Plankton	Планктон	Plankton	Plankton, keijusto	Small or microscopic aquatic plants and animals that are suspended freely in the water column; they drift passively and cannot move against the horizontal motion of the water (contrast with nekton that are capable of horizontal movement). Planktic animals (zooplankton) include small protozoans and the eggs and larvae of larger animals. Some migrate vertically in the water column each day (diel vertical migration). Phytoplankton including diatoms, cyanobacteria, dinoflagellates and coccolithophores are planktic primary producers.
Plateau	Плато	Platoo	Ylätasanko, ylänkö	In geography, an elevated plain, tableland, or flat-topped region of considerable extent. In oceanography, a bathymetric feature of broad extent elevated above the level of surrounding seafloor with a more or less flat top and steep sides.
Pleistocene	Плейстоцен	Pleistotseen	Pleistoseeni	Period of geologic time extending from the end of Pliocene period around 2.6 million years ago up to the beginning of the Holocene period, 11700 years ago.