5-5

the sharp increase in water depth at the edge of the continental shelf separates the coastal zone from the vast volume of the ocean called the open sea primarily on the basis of the penetration of sunlight this deep blue sea is divided into a brightly lit surface layer a dimly lit middle layer and a dark bottom zone
在水深度的猛增在大陸架的邊緣從主要根據這深藍色海被劃分成一個明亮地被點燃的表層每昏暗地被點燃的中間層數和一個黑暗的底下區域陽光的滲透稱的公海海洋的浩大的容量分離沿海水域the euphotic is the brightly lit upper zone where driftingphytoplankton carry out photosynthesis and are responsible for about 40% of the worlds photosyntheticactivity nutrient levels are low and levels of dissolved oxygen are high large fast-swimming predatory fish such as swordfish sharks and bluefin tuna populate this zone
透光帶是明亮地被點燃的上部區域漂移的地方浮游植物執行光合作用並且對光合作用大約40%負責的世界活動營養水平低，並且被溶化的氧氣的水平是高大快速游泳掠食性魚例如箭魚鯊魚，並且金槍魚居住於這個區域
the bathyal zone is the dimly lit middle zone which because it has little sunlight does not contain photosynthesizing producers zooplankton and smaller fish many of which migrate to feed on the surface at night populate this zone
半深海帶是的昏暗地被點燃的中間區域，因為它有一點陽光不包含進行光合作用的生產商浮游動物，並且更小的魚許多移居對在表面的飼料在晚上居住於這個區域
the lowest zone called the abyssal zone is dark and very cold it has little dissolved oxygen neverthelessthe ocean floor is teeming with lift because it contains enough nutrients to support a large number of species even though there is no sunlight to support photosynthesis
稱然而它有一點被溶化的氧氣的深海底帶的最低的區域是黑暗和非常寒冷 海底是群集的與推力，因為它包含足夠的營養素支援很大數量的種類，即使沒有支援光合作用的陽光
Average primary productivity and Npp per unit of area are quite low in the open sea except at an occasional equatorial upwelling where currents bring up nutrients from the ocean bottom however because the open sea covers so much of the earths surface it makes the largest contribution to the earths overall npp
平均主要生產力和Npp每個區域單位是相當低的在然而潮流培養從海底的營養素除了在偶爾的赤道上湧的公海，因為公海蓋子地面它非常做對地球整體npp的最大的貢獻