Describe the effects of abiotic factors on the composition of plant and also animal communities in aquatic biomesCompare the qualities of the s zonesSummarize the characteristics of stand water and flowing water in freshwater biomes

Like terrestrial biomes, aquatic biomes are influenced by abiotic factors. In the case of aquatic biomes the abiotic components include light, temperature, flow regime, and also dissolved solids. The aquatic medium—water— has various physical and also chemical properties 보다 air. Also if the water in a pond or other body of water is perfectly clear (there are no exposed particles), water, on its own, absorbs light. Together one descends deep enough into a body of water, eventually there will certainly be a depth in ~ which the sunshine cannot reach. When there are some abiotic and biotic determinants in a terrestrial ecosystem that shade light (like fog, dust, or insect swarms), these space not typically permanent attributes of the environment. The importance of light in aquatic biomes is main to the areas of organisms discovered in both freshwater and also marine ecosystems since it controls productivity through photosynthesis.

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In addition to light, solar radiation warms bodies of water and also many exhibit distinct layers that water at differing temperatures. The water temperature affect the organisms’ prices of growth and also the lot of dissolved oxygen available for respiration.

The movement of water is likewise important in plenty of aquatic biomes. In rivers, the organisms need to obviously be adjusted to the constant movement that the water around them, yet even in larger bodies the water such as the oceans, regular currents and also tides impact accessibility of nutrients, food resources, and also the presence of the water itself.

Finally, all natural water includes dissolved solids, or salts. Fresh water consists of low levels of such dissolved substances since the water is promptly recycled with evaporation and precipitation. The oceans have actually a relatively constant high salt content. Aquatic habitats in ~ the user interface of marine and also freshwater ecosystems have complicated and change salt environments that variety between freshwater and also marine levels. This are known as brackish water environments. Lakes situated in close up door drainage containers concentrate salt in their waters and also can have incredibly high salt contents that only a couple of and highly devoted species are able come inhabit.

Marine Biomes

The ocean is a continuous body the salt water the is relatively uniform in chemistry composition. That is a weak equipment of mineral salts and decayed organic matter. Within the ocean, coral reefs are a second kind of maritime biome. Estuaries, coastal areas where salt water and fresh water mix, form a third unique maritime biome.

The s is categorized by several zones (

). All of the ocean’s open up water is described as the pelagic realm (or zone). The benthic kingdom (or zone) extends follow me the s bottom from the shoreline to the deepest components of the s floor. Native the surface ar to the bottom or the limit to i m sorry photosynthesis occurs is the photic region (approximately 200 m or 650 ft). In ~ depths greater than 200 m, light cannot penetrate; thus, this is described as the aphotic zone. The bulk of the ocean is aphotic and also lacks enough light because that photosynthesis. The deepest component of the ocean, the Challenger Deep (in the Mariana Trench, situated in the western Pacific Ocean), is around 11,000 m (about 6.8 mi) deep. To give some perspective on the depth of this trench, the s is, on average, 4267 m or 14,000 ft deep.


The physical diversity of the ocean has a far-reaching influence ~ above the diversity the organisms the live within it. The s is categorized into different zones based on how far light reaches into the water. Each zone has actually a distinctive group of types adapted to the biotic and abiotic conditions certain to the zone.

The intertidal zone (

) is the oceanic an ar that is closest to land. With each tidal cycle, the intertidal zone alternates between being inundated v water and left high and dry. Generally, most civilization think of this section of the ocean as a sandy beach. In part cases, the intertidal zone is undoubtedly a sandy beach, yet it can also be rocky, muddy, or dense with tangled root in mangrove forests. The intertidal ar is very variable environment because of tides. Organisms may be exposed come air at low tide and are underwater throughout high tide. Therefore, living points that flourish in the intertidal zone room often adjusted to being dry for long periods of time. The coast of the intertidal region is additionally repeatedly win by waves and also the organisms found there are adapted to withstand damages from the pounding activity of the waves (
). The exoskeletons of coast crustaceans (such as the shore crab, Carcinus maenas) space tough and also protect them indigenous desiccation (drying out) and wave damage. Another an effect of the pounding tide is that few algae and also plants create themselves in constantly moving sand or mud.

Figure 1: Sea stars, sea urchins, and also mussel shells are often found in the intertidal zone, presented here in Kachemak Bay, Alaska. (credit: NOAA)

The neritic region (

) extends native the margin of the intertidal zone to depth of about 200 m (or 650 ft) in ~ the edge of the continental shelf. When the water is fairly clear, photosynthesis can take place in the neritic zone. The water contains silt and is well-oxygenated, short in pressure, and also stable in temperature. These factors all contribute to the neritic zone having the greatest productivity and biodiversity of the ocean. Phytoplankton, consisting of photosynthetic bacteria and also larger varieties of algae, are responsible for the mass of this main productivity. Zooplankton, protists, tiny fishes, and also shrimp feeding on the producers and are the primary food resource for most of the world’s fisheries. The majority of these fisheries exist in ~ the neritic zone.

Beyond the neritic region is the open ocean area recognized as the oceanic region (

). Within the oceanic zone there is thermal stratification. Abundant phytoplankton and zooplankton support populations of fish and whales. Nutrients space scarce and also this is a fairly less productive part of the marine biome. As soon as photosynthetic organisms and the organisms the feed on castle die, their bodies autumn to the bottom the the s where lock remain; the open s lacks a process for pass the organic nutrients earlier up come the surface.

Beneath the pelagic zone is the benthic realm, the deepwater region beyond the continental shelf (

). The bottom the the benthic realm is made up of sand, silt, and dead organisms. Temperature decreases as water depth increases. This is a nutrient-rich portion of the ocean because of the dead organisms that fall from the top layers that the ocean. As such high level that nutrients, a diversity that fungi, sponges, sea anemones, naval worms, sea stars, fishes, and also bacteria exists.

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The deepest part of the s is the abyssal zone, i beg your pardon is at depth of 4000 m or greater. The abyssal ar (

) is an extremely cold and has an extremely high pressure, high oxygen content, and also low nutrient content. There space a range of invertebrates and fishes found in this zone, but the abyssal zone walk not have actually photosynthetic organisms. Chemosynthetic bacteria use the hydrogen sulfide and also other mineral emitted from deep hydrothermal vents. This chemosynthetic bacteria use the hydrogen sulfide as an energy source and offer as the base of the food chain found approximately the vents.