TERMIUM Plus^®

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Record number: 1, Textual support number: 1 CONT

The importance of oceans and the life within them is often understated. Oceans make up 71% of the Earth's surface, and produce 50-80% of the oxygen in the atmosphere ... A majority of this oxygen is produced by microscopic free-floating plants, also known as phytoplankton, which account for the majority of bottom trophic level production in most marine ecosystems. A large number of marine food webs are under "bottom-up" control, in which the quantity of primary production controls the abundance of individuals within trophic levels and their biomass. The Arctic marine ecosystem is thought to be under bottom-up control, where primary production is largely limited by advective nutrient supply from adjacent oceans ...  2, fiche 1, Anglais, - lower%20trophic%20level%20production

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol