freshwater ecosystem
111Nekton — refers to the aggregate of actively swimming aquatic organisms in a body of water (usually oceans or lakes) able to move independently of water currents. Nekton are contrasted with plankton which refers to the aggregate of passively floating,… …
112Marine snow — Underway recovery of a sediment trap used to collect marine snow and estimate export production In the deep ocean, marine snow is a continuous shower of mostly organic detritus falling from the upper layers of the water column. It is a… …
113Marine reptile — Sea turtle. Marine reptiles are reptiles which have become secondarily adapted for an aquatic or semi aquatic life in a marine environment. The earliest marine reptiles arose in the Permian period during the Paleozoic era. During the …
114Mudflat — General sketch map of a tidal plain, showing the typical tripartition in supratidal, intertidal and subtidal zones. The most apparent character of the area is the development of tidal channels, affecting mainly the intertidal zone. In this case,… …
115Dead zone (ecology) — This article is about the oceanic phenomenon. For other uses, see Dead Zone (disambiguation). Red circles show the location and size of many dead zones. Black dots show dead zones of unknown size. The size and number of marine dead zones areas… …
116Colored dissolved organic matter — (CDOM) is the optically measurable component of the dissolved organic matter in water. Also known as chromophoric dissolved organic matter, yellow substance, and gelbstoff, CDOM occurs naturally in aquatic environments primarily as a result of… …
117Marine larval ecology — is the study of the factors influencing the dispersing larval stage exhibited by many marine invertebrates and fishes. Marine organisms with a larval stage usually release large numbers of larvae into the water column, where these larvae develop… …
118Marine conservation activism — Animated map of the world s oceanic waters. Marine conservation activism refers to the efforts of non governmental organizations and individuals to bring about social and political change in the area of marine conservation. Marine conservation is …
119Marine invertebrates — The 49th plate from Ernst Haeckel s Kunstformen der Natur, 1904, showing various sea anemones classified as Actiniae Marine invertebrates are animals that inhabit a marine environment and are invertebrates, lacking a vertebral column. In order to …
120Marine vertebrate — Marine vertebrates are vertebrates which live in a marine environment. These primarily include fish, seabirds, marine reptiles, and marine mammals. These animals have an internal skeleton and make up about 4%[citation needed] of the sea s animal… …
