aphotic zone

For information on animals that live in the deeper areas of the oceans see aphotic zone.

The deep sea starts at the aphotic zone, the point where sunlight loses most of its energy in the water.

In general, the deep sea is considered to start at the aphotic zone, the point where sunlight loses its power of transference through the water.

The aphotic zone can be subdivided into three different vertical regions, based on depth and temperature.

Much of the aphotic zone's energy is supplied by the open ocean in the form of detritus.

The profundal zone is part of the aphotic zone.

The depth of the aphotic zone can be greatly affected by such things as turbidity and the season of the year.

The pelagic part of the aphotic zone can be further divided into regions that succeed each other vertically according to temperature.

In the ocean, this leads to a vertical separation of nitrification from primary production, and confines it to the aphotic zone.

The bottommost zone, below the euphotic zone, is called the aphotic zone.

It is a significant means of exporting energy from the light-rich photic zone to the aphotic zone below.

From the darkness of the aphotic zone, it feeds upon small squid and shrimp, as well as dead fish drifting down from above.

The aphotic zone underlies the photic zone, which is that portion of a lake or ocean directly affected by sunlight.

The abyssal zone lies partially in the dysphotic and partially in the aphotic zones.

Life forms which inhabit the aphotic zone are often capable of movement upwards through the water column into the photic zone for feeding.

Extending from the bottom of the photic zone down to the seabed is the aphotic zone, a region of perpetual darkness.

Marine snow can be an important food source for organisms living in the aphotic zone, particularly for organisms which live very deep in the water column.

Changes in primary production in the photic zone are expected to alter the standing stocks in the food-limited aphotic zone.

At equilibrium, the export flux of organic material sinking into the aphotic zone is balanced by the upward flux of nitrate.

Along with pelagic aphotic zones there are also benthic aphotic zones.

The off shore areas may be called the pelagic zone, and the aphotic zone may be called the profundal zone.

The aphotic zone is further divided into additional zones: the bathyal zone, the abyssal zone, and the hadal zone.

Living almost exclusively in the aphotic zone where little to no sunlight penetrates, the Portuguese dogfish is relatively common and the dominant shark species in deeper waters.

Export production is the amount of organic matter produced in the ocean by primary production that is not recycled (remineralised) before it sinks into the aphotic zone.

This leads to the situation whereby any nitrate in the water column must be from the aphotic zone, and must have originated from organic material transported there by sinking.