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Marine habitats - Wikipedia. This article is about habitats for marine life. For underwater habitats for humans, see Underwater habitat. The marine environment supplies many kinds of habitats that support marine life.

Marine life depends in some way on the saltwater that is in the sea (the term marine comes from the Latinmare, meaning sea or ocean). A habitat is an ecological or environmental area inhabited by one or more living species.[1][2]Marine habitats can be divided into coastal and open ocean habitats. Coastal habitats are found in the area that extends from as far as the tide comes in on the shoreline out to the edge of the continental shelf. Most marine life is found in coastal habitats, even though the shelf area occupies only seven percent of the total ocean area.

Open ocean habitats are found in the deep ocean beyond the edge of the continental shelf. Alternatively, marine habitats can be divided into pelagic and demersal zones.

Pelagic habitats are found near the surface or in the open water column, away from the bottom of the ocean. Demersal habitats are near or on the bottom of the ocean. An organism living in a pelagic habitat is said to be a pelagic organism, as in pelagic fish. Similarly, an organism living in a demersal habitat is said to be a demersal organism, as in demersal fish. Pelagic habitats are intrinsically shifting and ephemeral, depending on what ocean currents are doing. Marine habitats can be modified by their inhabitants. Watch Online Watch Detropia Full Movie Online Film. Some marine organisms, like corals, kelp, mangroves and seagrasses, are ecosystem engineers which reshape the marine environment to the point where they create further habitat for other organisms.

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Overview[edit]. Only 2. The rest is ocean, home to the marine habitats.

The oceans are nearly four kilometres deep on average and are fringed with coastlines that run for nearly 3. In contrast to terrestrial habitats, marine habitats are shifting and ephemeral. Swimming organisms find areas by the edge of a continental shelf a good habitat, but only while upwellings bring nutrient rich water to the surface.

Shellfish find habitat on sandy beaches, but storms, tides and currents mean their habitat continually reinvents itself. The presence of seawater is common to all marine habitats.

Beyond that many other things determine whether a marine area makes a good habitat and the type of habitat it makes. For example: temperature – is affected by geographical latitude, ocean currents, weather, the discharge of rivers, and by the presence of hydrothermal vents or cold seepssunlight – photosynthetic processes depend on how deep and turbid the water isnutrients – are transported by ocean currents to different marine habitats from land runoff, or by upwellings from the deep sea, or they sink though the sea as marine snowsalinity – varies, particularly in estuaries or near river deltas, or by hydrothermal ventsdissolved gases – oxygen levels in particular, can be increased by wave actions and decreased during algal bloomsacidity – this is partly to do with dissolved gases above, since the acidity of the ocean is largely controlled by how much carbon dioxide is in the water.

Ocean. Areamillion km. Volume[3]million cu km %Mean depthkm. Max depthkm. Coastlinekm %Ref. Pacific Ocean. 15.

Atlantic Ocean. 76. Indian Ocean. 68. Southern Ocean. 20.

Arctic Ocean. 14. Overall. 33. 5. 3.

Land runoff, pouring into the sea, can contain nutrients. The ocean occupies 7. There are five major oceans, of which the Pacific Ocean is nearly as large as the rest put together.

Coastlines fringe the land for nearly 3. Marine habitats can be broadly divided into pelagic and demersal habitats.[citation needed] Pelagic habitats are the habitats of the open water column, away from the bottom of the ocean. Demersal habitats are the habitats that are near or on the bottom of the ocean.

An organism living in a pelagic habitat is said to be a pelagic organism, as in pelagic fish. Similarly, an organism living in a demersal habitat is said to be a demersal organism, as in demersal fish. Pelagic habitats are intrinsically ephemeral, depending on what ocean currents are doing.[citation needed]The land- based ecosystem depends on topsoil and fresh water, while the marine ecosystem depends on dissolved nutrients washed down from the land.[1. Ocean deoxygenation poses a threat to marine habitats, due to the growth of low oxygen zones.[1. Ocean currents[edit]Ocean gyres rotate clockwise in the north and counterclockwise in the south.

In marine systems, ocean currents have a key role determining which areas are effective as habitats, since ocean currents transport the basic nutrients needed to support marine life.[1. Plankton are the life forms that inhabit the ocean that are so small (less than 2 mm) that they cannot effectively propel themselves through the water, but must drift instead with the currents. If the current carries the right nutrients, and if it also flows at a suitably shallow depth where there is plenty of sunlight, then such a current itself can become a suitable habitat for photosynthesizing tiny algae called phytoplankton. These tiny plants are the primary producers in the ocean, at the start of the food chain. In turn, as the population of drifting phytoplankton grows, the water becomes a suitable habitat for zooplankton, which feed on the phytoplankton.

While phytoplankton are tiny drifting plants, zooplankton are tiny drifting animals, such as the larvae of fish and marine invertebrates. If sufficient zooplankton establish themselves, the current becomes a candidate habitat for the forage fish that feed on them. And then if sufficient forage fish move to the area, it becomes a candidate habitat for larger predatory fish and other marine animals that feed on the forage fish. In this dynamic way, the current itself can, over time, become a moving habitat for multiple types of marine life. Ocean currents can be generated by differences in the density of the water. How dense water is depends on how saline or warm it is.

If water contains differences in salt content or temperature, then the different densities will initiate a current. Water that is saltier or cooler will be denser, and will sink in relation to the surrounding water. Conversely, warmer and less salty water will float to the surface. Atmospheric winds and pressure differences also produces surface currents, waves and seiches. Ocean currents are also generated by the gravitational pull of the sun and moon (tides), and seismic activity (tsunami).[1.

The rotation of the Earth affects the direction ocean currents take, and explains which way the large circular ocean gyres rotate in the image above left. Suppose a current at the equator is heading north. The Earth rotates eastward, so the water possesses that rotational momentum. But the further the water moves north, the slower the earth moves eastward.

If the current could get to the North Pole, the earth wouldn't be moving eastward at all. To conserve its rotational momentum, the further the current travels north the faster it must move eastward. So the effect is that the current curves to the right. This is the Coriolis effect. It is weakest at the equator and strongest at the poles.

The effect is opposite south of the equator, where currents curve left.[1. Marine topography[edit]. Map of underwater topography (1. NOAA)Marine (or seabed or ocean) topography refers to the shape the land has when it interfaces with the ocean. These shapes are obvious along coastlines, but they occur also in significant ways underwater. The effectiveness of marine habitats is partially defined by these shapes, including the way they interact with and shape ocean currents, and the way sunlight diminishes when these landforms occupy increasing depths.

Tidal networks depend on the balance between sedimentary processes and hydrodynamics however, anthropogenic influences can impact the natural system more than any physical driver.[1.

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