coastal ecosystem

A coastal ecosystem, specifically the littoral zone, is the marine environment where tidal and longshore currents, along with breaking waves, exert influence down to about 5 to 10 meters below the low-tide mark. This zone is rich in dissolved oxygen, sunlight, and nutrients, but also experiences high wave energy and water motion. The types of life found here depend heavily on the bottom's geology and exposure to waves.1

Pollution, including chemical contaminants and excess nutrients from runoff, poses a significant threat to coastal ecosystems. This can lead to degraded water quality, harm diverse shallow-water ecosystems, and negatively impact productive fisheries. For instance, nutrient enrichment can cause algal blooms and create "dead zones" with depleted oxygen, suffocating marine life.2

Oceanography is the scientific study of all aspects of the oceans, encompassing their physical and chemical properties, geological framework, and the life they support. It is traditionally divided into physical oceanography, chemical oceanography, marine geology, and marine ecology. Understanding oceanography is crucial for predicting weather and climate changes, managing Earth's resources, and preserving ocean quality against increasing human demands. Ocean currents, driven by Earth's rotation, atmospheric patterns, and temperature/salinity gradients, significantly influence the distribution of marine organisms.34