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ReefLink Database

Light

Light

Light is the level of visible and ultraviolet solar radiation that penetrates the water column.

CMap

Algae are aquatic, photosynthetic plant-like organisms and include calcareous macroalgae, fleshy macroalgae, turf algae, and crustose coralline algae. Anemones & zooanthids are cnidarians very similar to coral, but are not characteristic reef builders. Contact Uses, such as biological additions, physical damage, and biological harvesting, are activities in which humans create pressures through direct contact with the ecosystem. Coral is a colonial marine animal consisting of polyps. 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. Discharge limitations are responses to regulate and control the discharge of pollutants and the use of chemicals. Discharges are the intentional or unintentional distribution of chemicals, debris, or other pollution, into the environment as a consequence of human activities. Ecosystem monitoring and restoration refers to responses to directly alter the condition of the reef ecosystem through restoration or remediation activities, setting limits on degradation through biological criteria or water quality criteria, or improving knowledge through monitoring, mapping, and scientific research. Ecosystem services are the benefits people obtain from ecosystems . Fish are cold-blooded aquatic vertebrates that breathe through gills and usually have scales. An Invertebrate is any animal that lacks a backbone. 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 vertebrates are aquatic animals with a backbone, such as sea turtles, whales, dolphins and marine birds. 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. The Reef Ecosystem includes a suite of abiotic variables that form the physical and chemical environment. Plankton are any plants or animals that are too small to actively move against ocean currents. 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 Habitat is the abundance, distribution, and condition of the benthic components of the reef ecosystem. Reef Inhabitants are all of the motile components of the reef ecosystem, including fish, invertebrates, marine reptiles and mammals, and are quantified by their abundance, distribution, and condition. 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. Resource use management pertains to responses to regulate or limit contact activities that may directly impact coastal species through harvesting or physical damage. 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. 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. Sponges are sessile colonial animals with soft porous bodies supported by a fibrous skeletal framework. Supporting services are ecological processes that indirectly benefit humans by maintaining a functional ecosystem for the production of other ecosystem goods and services. Tunicates, or 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). A wetland is an area of land whose soil is saturated with moisture either permanently or seasonally.

CMap Description

Availability of light varies with water depth, and is a key factor distinguishing deep and shallow water communities. Deposition or resuspension of sediment from run-off, dredging or boat movement will affect light availability. Excess nutrients from wastewater discharges or nutrient run-off can also impact light levels. Changes in light can impact the growth of reef species, alter competitive interactions among algae and coral, or alter the behavior of fish and invertebrates. Elevated solar radiation, in concert with elevated sea surface temperatures, may exacerbate coral bleaching. Changes in reef condition can impact the availability of ecosystem services. Many of the same socio-economic sectors that cause pollution benefit indirectly from reef goods and services including fishing and recreational opportunities that contribute to the cultural identity of the local community. Monitoring and scientific research can be used to track light levels, and better understand the effects of light availability on reef life. Discharge limitations and resource-use management can be used to limit discharges and resuspension of sediments and nutrients in coastal waters.

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