Limnology is the branch of ecology that focuses on the study of inland waters, including lakes, rivers, ponds, and wetlands.

Coral reefs are underwater ecosystems characterized by the presence of coral colonies, which provide habitat and shelter for a variety of marine organisms.

The nitrogen cycle is a biogeochemical cycle that involves the conversion of nitrogen gas into various forms that can be used by living organisms.

Phytoplankton are microscopic algae that are responsible for a significant portion of primary production in aquatic ecosystems.

Decomposition is the process by which organic matter is broken down into simpler substances by microorganisms, such as bacteria and fungi.

Sea otters are considered keystone species in kelp forest ecosystems, as they prey on sea urchins, which helps to maintain the health and diversity of the kelp forest.

Bioaccumulation is the process by which pollutants accumulate in the tissues of aquatic organisms, often through the food chain.

Green sea turtles are classified as a threatened species due to various factors, including habitat loss, overexploitation, and climate change.

Ecophysiology is the study of the physiological adaptations of aquatic organisms to their environment.

Zebra mussels are an example of an invasive aquatic species that can cause significant ecological and economic impacts.

Acclimation is the process by which aquatic organisms adjust their physiology and behavior to changes in their environment.

Habitat restoration is an important conservation measure for aquatic ecosystems, as it helps to improve the quality and availability of habitat for aquatic organisms.

Biogeography is the study of the distribution and abundance of aquatic organisms in relation to their environment.

Deforestation, overfishing, pollution, and climate change are all human activities that can negatively impact aquatic ecosystems.

Ecology is the study of the interactions between aquatic organisms and their environment.