Why would you not expect to find any photosynthetic organisms in the Aphotic zone of a lake?

Why would you not expect to find any photosynthetic organisms in the Aphotic zone of a lake?

Because only the surface of water is in contact with air, dissolved oxygen concentrations are highest in this zone. Photosynthetic organisms are confined to this zone of light penetration. Aphotic Zone: (200 m +) Below the reach of light, which is sparsely populated because there are no photosynthetic organisms.

In which area would you expect to find organisms adapted to variations in aquatic salinity?

Organisms that live in estuaries must be adapted to these dynamic environments, where there are variations in water chemistry including salinity, as well as physical changes like the rise and fall of tides. Despite these challenges, estuaries are also very productive ecosystems.

Which zone probably has the greatest variety of living things?

Species diversity is greatest in the tropics, particularly in tropical forests and coral reefs. The Amazon basin in South America has the largest area of tropical forests.

What factors determine the distribution of life in lakes?

The structure and function of ponds and lakes are determined by factors such as turbulence, temperature, water clarity, habitat size, and water depth. Wind turbulence and temperature interact to influence stratification and water circulation within lakes.

Is Mesopelagic a aphotic?

The depth at which the aphotic zone begins in the ocean depends on many factors. The aphotic zone is further divided into the mesopelagic zone, the bathyal zone, the abyssal zone, and the hadal zone. The mesopelagic zone extends from 200 metres (656 ft) to 2,000 metres (6,562 ft).

What lives in the aphotic zone?

Animals That Live in the Aphotic Region

• Tubeworms. Giant tubeworms (Riftia pachyptila) live near hydrothermal vents in the ocean floor.
• Giant and Colossal Squid. Both the giant squid (Architeuthis dux) and the colossal squid (Mesonychoteuthis hamiltoni) spend most of their lives in the deep ocean.
• Anglerfish.
• Goblin Sharks.

Which biome has the greatest variety of plants?

Tropical forests
Tropical forests are widely considered to have the greatest species diversity of the terrestrial biomes and the tundra biome has the least.

How are organisms living in the deep ocean?

Organisms living in the deep ocean must survive in a physical environment that is radically different from ocean habitats near the sea surface.

What are the conditions for life in the deep sea?

Travel to 1,000 meters (3,280 feet) below the ocean’s surface and most organisms with gas-filled spaces (e.g., lungs) would be crushed by the pressures that other deep-sea life experience. Light is virtually absent in the deep ocean, which means that deep-sea organisms cannot rely on vision for feeding, avoiding being eaten, or mating.

How does life in the deep ocean survive without light?

Today, we know that life can occur without light, and many ecosystems are supported in ways other than plant-based photosynthesis. For example, hydrothermal vents are based on chemosynthesis, in which organisms get their energy from sulfur and other “toxic” chemicals. Despite these discoveries, the deep ocean remains vastly unexplored.

How are deep sea ecosystems independent of sunlight?

Principle 5g : There are deep ocean ecosystems that are independent of energy from sunlight and photosynthetic organisms. Hydrothermal vents, submarine hot springs, and methane cold seeps rely only on chemical energy and chemosynthetic organisms to support life.