C25 Review Primary Productivity/Marine Life

Front

What is primary productivity?

Back

The rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances.

Front

What are the two main types of primary productivity?

Back

Gross primary productivity (GPP) and net primary productivity (NPP).

Front

What is the difference between GPP and NPP?

Back

GPP is the total amount of energy captured by photosynthesis, while NPP is the energy available to consumers after autotrophs have used some for respiration.

Front

What factors influence primary productivity in marine ecosystems?

Back

Light availability, nutrient concentration, temperature, and water movement.

Front

What role do phytoplankton play in marine ecosystems?

Back

Phytoplankton are primary producers that form the base of the marine food web.

Front

What is the significance of the photic zone in marine environments?

Back

The photic zone is the upper layer of water where sunlight penetrates, allowing photosynthesis to occur.

Front

Define the term 'biodiversity'.

Back

The variety of life in the world or in a particular habitat or ecosystem.

Front

What is the importance of biodiversity in marine ecosystems?

Back

Biodiversity contributes to ecosystem resilience, productivity, and stability.

Front

What are marine food webs?

Back

Complex networks of feeding relationships among marine organisms.

Front

What is the role of decomposers in marine ecosystems?

Back

Decomposers break down dead organic matter, recycling nutrients back into the ecosystem.