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ReefLink Database

Physical & Chemical Environment

Physical & Chemical Environment

The Reef Ecosystem includes a suite of abiotic variables that form the physical and chemical environment. Chemical variables include nutrients, toxic chemicals, and changes in ocean acidity. Physical variables include both freshwater and seawater flow, sediment, light, and benthic substrate, as well as a number of variables related to climate, including sea surface temperature and tropical storms.

CMap

Carbon dioxide is a greenhouse gas used by primary producers, such as plants and algae, to produce sugars. The Chemicals in the ocean, such as the CO2, pH levels, and salinity, may vary depending on the drivers and pressures. Climate reflects a region's temperature, humidity, air pressure, and weather. Cultural services are the nonmaterial benefits people obtain from ecosystems through spiritual enrichment, cognitive development, recreational opportunities, aesthetic experiences, sense of place, and educational and research opportunities. Discharges are the intentional or unintentional distribution of chemicals, debris, or other pollution, into the environment as a consequence of human activities. Ecosystem services are the benefits people obtain from ecosystems . Environmental monitoring describes the processes and activities that need to take place to characterize and monitor the quality of the physical and chemical environment. Landscape Changes are alterations of the natural landscape through human activities, including coastal development, shoreline armoring, impervious surfaces, deforestation, or soil disturbance, which can alter water flow patterns and lead to pollutant runoff into coastal systems. Light is the level of visible and ultraviolet solar radiation that penetrates the water column. Marine debris includes garbage, plastics, glass, and metal, which are not disposed of properly and can enter coastal waters. Nutrients are essential elements needed by plants and animals for growth and primarily include nitrogen, phosphorous, and potassium, as well as minor nutrients such as calcium, magnesium, or zinc. Ocean acidity reflects the pH of the ocean's surface, and is determined by dissolution rates of atmospheric CO2 and sea surface temperatures. The Reef Ecosystem includes a suite of abiotic variables that form the physical and chemical environment. Physical Damage to reef habitat and wetlands can occur from vessel groundings, dredging, trampling, boat movement, anchor drops, trawling, and fishing gear. The Physical aspects of coral reef ecosystems, such as the depth, temperature, and light, vary depending on the drivers and pressures. Pressures are human activities that create stress on the environment. Provisioning services are the products or ecosystem goods obtained from ecosystems, including seafood, genetic and biochemical resources, pharmaceuticals, ornamental resources, and water resources. The state of the Reef Ecosystem is the condition, in terms of quantity and quality, of the abiotic and biotic components including physical, chemical, and biological variables. Reef Life is the abundance, distribution, and condition of the biological components of the coral reef ecosystem. Regulating Services are benefits obtained from ecosystem processes that regulate the environment, including erosion regulation, natural hazard regulation, and climate regulation. Responses are actions taken by groups or individuals in society and government to prevent, compensate, ameliorate or adapt to changes in Ecosystem Services or their perceived value. Salinity is the dissolved salt concentration in water, and is the key factor distinguishing ocean water from freshwater. Sea temperature is a measure of the warmth of ocean waters, and depends on water depth, solar radiation, water circulation patterns, and atmospheric temperatures. Seawater flow reflects circulation patterns, currents, and wave action that move water throughout the ocean and towards the coastline. Sediment includes dirt, sand, silt, clay, and small rocks that form soil on land or soft substrate in marine habitats, and may be transported by water, wind, or human activities. Socio-Economic Drivers include the sectors that fulfill human needs for Food & Raw Materials, Water, Shelter, Health, Culture, and Security, and the Infrastructure that supports the sectors. Storms and hurricanes are periodic events of high precipitation, winds, wave action, and flooding that can potentially cause damage to reef habitat, property, or human lives. Supporting services are ecological processes that indirectly benefit humans by maintaining a functional ecosystem for the production of other ecosystem goods and services. Surface and groundwater flow reflects the patterns of water movement across the landscape, including rivers, streams, underground water, or stormwater. Toxics are chemical pollutants that are poisonous, carcinogenic, or otherwise directly harmful to humans, plants, or animals. Water depth reflects the height between the bottom of the seafloor and water surface, and is often indicative of distinct ecological communities (shallow water species; deep water species).

CMap Description

Coral reefs occur in seas with very specific environmental and climatic conditions. Changes in the frequency, concentration, and distribution of physical and chemical environmental variables can affect the survival, growth, and reproduction of reef life, impacting the welfare of humans through the provision of ecosystem services. Often the socio-economic drivers that benefit from the ecosystem are the same drivers that exert pressures on the ecosystem through their activities, including physical damage or discharge of chemical and physical pollutants. Responses may seek to better understand or improve the physical & chemical environment through monitoring or remediation activities.

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