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nutrients

Aquatic Life Designated Use Study

Introduction Historical Conditions When the DRBC was created in 1961, little or no dissolved oxygen (DO) was present in the Delaware River Estuary from Wilmington to Philadelphia for…

Habitat Conservation in Puerto Rico

A Special Place... The picturesque hillsides and vibrant blue waters of northeast Puerto Rico and nearby Culebra Island are home to marine and terrestrial ecosystems that make it a truly special place. This…

What is upwelling?

Winds blowing across the ocean surface push water away. Water then rises up from beneath the surface to replace the water that was pushed away. This process is known as “upwelling.” Upwelling occurs in the open ocean and…

What is nutrient pollution?

Nutrients can run off of land in urban areas where lawn and garden fertilizers are used. Pet and wildlife wastes are also sources of nutrients. To see how this happens, consider this

What is a thermocline?

Bodies of water are made up of layers, determined by temperature. The top surface layer is called the epipelagic zone, and is sometimes referred to as the "ocean skin" or "sunlight zone". This layer also interacts…

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