Benthic realm

Definition

Benthic realm refers to the ecological region at the lowest level of a body of water, including the sediment surface and some sub-surface layers. It is home to a diverse range of organisms that live in or on the ocean floor, lake beds, or river bottoms.

5 Must Know Facts For Your Next Test

1. The benthic realm includes environments such as coral reefs, kelp forests, and deep-sea trenches.
2. Organisms found in the benthic realm are called benthos and include species like crabs, worms, and starfish.
3. Benthic zones can be divided into subzones such as littoral (near shore) and abyssal (deep ocean).
4. Photosynthetic activity is limited in deeper benthic zones due to lack of sunlight penetration.
5. Benthic environments play a crucial role in nutrient recycling and sediment stabilization.

Review Questions

• What types of organisms are typically found in the benthic realm?
• How does sunlight availability affect photosynthetic activity in different parts of the benthic zone?
• Why are benthic environments important for nutrient recycling?

Related terms

pelagic zone: The open water area above the ocean floor where organisms such as fish and plankton live

photic zone:

The upper layer of a body of water that receives enough sunlight for photosynthesis to occur

abyssal plain: A flat or gently sloping area of the deep ocean basin floor