Where are oligotrophic oceans?

In the ocean, the subtropical gyres north and south of the equator are regions in which the nutrients required for phytoplankton growth (for instance, nitrate, phosphate and silicic acid) are strongly depleted all year round. These areas are described as oligotrophic and exhibit low surface chlorophyll.

Is the Southern Ocean oligotrophic?

The Southern Ocean has very high nutrient levels in the surface waters while only low standing stocks of phytoplankton are found (Holm- Hansen 1985). Utilization of nutrients appears to be less efficient than in the coastal upwelling and oligotrophic ecosystems of temperate zones. Spring levels of nutrients.

Why are tropical oceans oligotrophic?

Abstract. Oligotrophy has its basis in low inorganic nutrient availability and it is generally known that in equatorial waters inorganic nutrient availability is insufficient to sustain the richness of life observed in some special places at this latitude.

Is the open ocean oligotrophic?

In vitro observations of net community production (NCP) imply that the oligotrophic subtropical gyres of the open ocean are net heterotrophic; in situ observations, in contrast, consistently imply that they are net autotrophic.

What is meant by oligotrophic?

Definition of oligotrophic : having a deficiency of plant nutrients that is usually accompanied by an abundance of dissolved oxygen clear oligotrophic lakes.

What is oligotrophic water?

Oligotrophic: An oligotrophic lake or water body is one which has a relatively low productivity due to the low nutrient content in the lake. The waters of these lakes are usually quite clear due to the limited growth of algae in the lake. The waters of such lakes are of high-drinking quality.

What is oligotrophic and eutrophic?

Oligotrophic lakes generally host very little or no aquatic vegetation and are relatively clear, while eutrophic lakes tend to host large quantities of organisms, including algal blooms.

What is an example of oligotrophic lake?

Lake Joseph and Skeleton Lake are good examples of oligotrophic lakes. Lakes containing between 10 – 20 µg/L of total phosphorus are termed mesotrophic. These lakes have some aquatic vegetation and can support an array of fish species.

Where are oligotrophic lakes found?

northern Minnesota
Oligotrophic lakes are usually found in northern Minnesota and have deep clear water, rocky and sandy bottoms, and very little algae. The fish found in oligotrophic lakes like cold, high oxygenated water, examples include lake trout and whitefish (more information on fish).

What is an oligotrophic microorganism?

Oligotrophic bacteria (oligotrophs) are microorganisms that grow in extremely nutritionally deficient conditions in which the concentrations of organic substances are low. Many oligotrophic bacteria were isolated from clinical materials including urine, sputum, swabbings of the throat, vaginal discharges, and others.

Where is the Antarctic Ocean?

The Southern Ocean, also known as the Antarctic Ocean, comprises the southernmost waters of the World Ocean, generally taken to be south of 60° S latitude and encircling Antarctica.

Is Southern Ocean and Antarctic Ocean the same?

Southern Ocean, also called Antarctic Ocean, body of salt water covering approximately one-sixteenth of Earth’s total ocean area. The Southern Ocean is made up of the portions of the world ocean south of the Pacific, Atlantic, and Indian oceans and their tributary seas surrounding Antarctica below 60° S.