nekton


nekton
nektonic, adj.
/nek"ton, -teuhn/, n.
the aggregate of actively swimming aquatic organisms in a body of water, able to move independently of water currents.
[1890-95; < G, n. use of neut. of nektós swimming (verbid of néchein to swim; see NECTOPOD)]

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      the assemblage of pelagic animals that swim freely, independent of water motion or wind. Only three phyla are represented by adult forms. chordate nekton include numerous species of bony fishes, the cartilaginous fishes such as the sharks, several species of reptiles (turtles, snakes, and saltwater crocodiles), and mammals such as the whales, porpoises, and seals. Molluscan (mollusk) nekton include the squids and octopods. The only arthropod nekton are decapods, including shrimps, crabs, and lobsters.

      Herbivorous nekton are not very common, although a few nearshore and shallow-water species subsist by grazing on plants. Of the nektonic feeding types, zooplankton feeders are the most abundant and include, in addition to many bony fishes, such as the sardines and mackerel, some of the largest nekton, the baleen whales. The molluscans, sharks, and many of the larger bony fishes consume animals bigger than zooplankton. Other fishes and most of the crustaceans are scavengers.

      Nektonic species are limited in their areal and vertical distributions by the barriers of temperature, salinity, nutrient supply, and type of sea bottom. The number of nektonic species and individuals decreases with increasing depth in the ocean.

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Universalium. 2010.

Look at other dictionaries:

  • Nekton — 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,… …   Wikipedia

  • nekton — 1893, from Ger. nekton (van Heusen, 1890), from Gk. nekton, neuter of nektos swimming, from nekhein to swim (see NATATORIUM (Cf. natatorium)) …   Etymology dictionary

  • nekton — [nek′tän΄, nek′tən] n. [Ger < Gr nēkton, neut. of nēktos, swimming < nēchein, to swim: see NATANT] the larger, aquatic, free swimming animal life having movements that are largely independent of currents and waves, including squids, fishes …   English World dictionary

  • nekton — ekton n. The aggregate of actively swimming animals in a body of water ranging from microscopic organisms to whales. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • Nekton — Nekton, im Gegensatz zum Plankton, d.h. den passiv treibenden Organismen an der Oberfläche des Meeres oder größerer Wasserflächen, die Gesamtheit der aktiv an der Wasseroberfläche schwimmenden Organismen. Vgl. Haeckel, Plankton Studien (Jena… …   Meyers Großes Konversations-Lexikon

  • Nekton — Nekton, im Pelagial des Meeres und der Süßgewässer im Gegensatz zum ⇒ Plankton sich aktiv auch gegen die Wasserströmung fortbewegende Tiere, v.a. Fische, aber auch z.B. Cephalopoden, Robben, Wale …   Deutsch wörterbuch der biologie

  • nekton — nèktōn m <G nektóna> DEFINICIJA zool. životinje koje se aktivno kreću u vodi, plivaju za razliku od planktona koji je nošen gibanjem vode ETIMOLOGIJA grč. nēkhtós: koji pliva ≃ nḗkhein: plivati …   Hrvatski jezični portal

  • Nekton — Marines Nekton: Ein Schwarm Atlantischer Heringe (Clupea harengus) auf Wanderung zu den Laichplätzen in der Ostsee. Die hohe Geschwindigkeit kann über mehrere Tausend Kilometer durchgehalten werden. Einige Wissenschaftler sind der Meinung, dass… …   Deutsch Wikipedia

  • nekton — noun Etymology: German Nekton, from Greek nēkton, neuter of nēktos swimming, from nēchein to swim more at natant Date: 1893 free swimming aquatic animals essentially independent of wave and current action • nektonic adjective …   New Collegiate Dictionary

  • Nekton — nektonas statusas T sritis ekologija ir aplinkotyra apibrėžtis Aktyviai plaukiojančių ir srovės jėgą įveikiančių vandens gyvūnų visuma (pvz., žuvys, banginiai, delfinai, galvakojai moliuskai). atitikmenys: angl. nekton vok. Nekton, n rus. нектон …   Ekologijos terminų aiškinamasis žodynas


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