Introduction to the deep sea environment

The deep sea Environment In this essay we will discuss various aspects of deep-sea environment. The main focus will be on the environment below the mesopelagic zone that extends up to 2000 meters below sea level, with an emphasis on the environment in areas bathypelagic and Abyssalpelagic.

Let's examine the sources of evidence for a discussion of this deep-water environment by looking at some of the techniques of man used to collect information there. This will be followed by a description of some of the determinants of the conditions in these regions with a note on the geology, sediments, a brief discussion of deep-water masses, a description of marine life found on deep-sea environment, their adaptations and challenges with a special note on hydrothermal vents (although at an average depth of 2100 meters are only in our area of debate), hydrocarbon seeps and final conclusion about the overall importance of deep-sea environment of mankind.

First, why study the deep sea environment at all? The abyssal plains are dark and appear devoid of life or of interest but nothing could be further from the truth. abyssal areas represent over 90% of benthos and over 80% of the ocean is below 3000 meters. The new discoveries are being made and these could greatly influence our future.

The sea is a repository of scientific information and resources that may influence the fields of medicine, chemistry, physics, biology, feeding the expanding world population and conservation. The sea is, in fact, the largest ecosystem on Earth. Let us first examine the methods of collecting evidence. The collection of evidence there are many techniques and devices have been used to explore the depths and collect information ranging from the days of falling lead weights (line probe) on the side of vessels to echo from the First World War, the invention of scuba gear (not useful in our discussion depths) in Geological use of long-range inclined ASDIC (GLORIA). SSS and continuous seismic survey methods gives us a great deal of information.

In addition to a range of simple devices give us information, such as thermometers, bottles of water and electricity meters to measure physical and chemical properties water, dredges, corers heat sensors, and cameras for the study of bottom sediment and the life of the fund. However, for centuries the only evidence we had marine life in the depths of the sea was very low. The area we are discussing has rarely been visited. Diving suits the atmosphere (JIM) can only cope 450 meters today. We need different equipment to explore the depths we are discussing. In 1964, Alvin made the first successful scientific high dive Manned submersibles on behalf of Woods Hole Oceanographic Institute. Later updates have been able to dive to 6,000 meters.

Alvin was the first in discovering hydrothermal vents and explore a small part of the oceanic ridge. We return to this setting later. For depths below this we remotely operated vehicle or ROV. Cutting-edge research is carried out by ROV by Woods Hole OI and Monterey Bay Aquarium Research Institute .. The man has even visited the lowest point. In January 1960, Piccard and Walsh descended in Trieste II (a bathyscaphe) to the deepest known point on Earth, the Trench of the Marianas in 10,915 meters. Despite the global shortage of evidence and the fact that the vast majority of the seabed remains to be explored that can discuss the environment deepwater dynamically.

The new discoveries are made frequently in this field. Let us now look at the environmental geological base deep water. Geology The oceanic lithosphere is about 100 km thick (hence significantly thinner than continental lithosphere) and this applies the crust and upper mantle. The lithosphere is composed mostly of peridotite. The top of the lithosphere is the crust that is mainly composed of granite rock lighter. The oceanic crust is thinner and denser than continental crust and consists mainly of basaltic rocks. The entire lithosphere (oceanic and continental) sits on top of the lower viscous layer called the asthenosphere, part of the upper mantle.

The lithosphere is composed of 7 main courses and 6 children the. New oceanic lithosphere, or at least the oceanic crust is formed at constructive plate boundaries. To the seafloor spreading ridges and asthenosphere wells cools and forms the ocean floor on both sides of the border. The Mid Atlantic Ridge is a classic example of this. The destruction of oceanic lithosphere in subduction zones. The subducting plate descends into the hot mantle and is destroyed, as it melts. The coast of Japan provides an example of this. It should be noted that the environment is dynamic through geologic time, the subduction process destroys the ocean floor. As new ocean floor is formed pushes him to the ground on both sides of distance and this can reach into a subduction zone and be destroyed. It is possible to date of the oceanic crust plates move apart and spread over the abyssal plain, since they assume the polarity of Earth's magnetic field. This work has been described by Matthews and Vine.

Also in general, talking about the age of oceanic crust away from the songs will be broadcast. The denser material sinks also further away from the sea surface. Given the age / depth relationship the age of the oceanic crust can also be estimated. The main "highlight" the characteristics of the ocean basins are perhaps half Ocean Ridge abyssal plain on both sides of this ridge, constructive plate margins or destructive plate margins with a deep ocean trench at the edge of the environment deep-water pelagic sediments covering the ground. Naturally, there are many variations to this pattern, but this leads to a consideration of sedimentation.

The sediments in the deep water environment in the deep sea environment really true that only deal with deep-sea sediments. However, there are two main types sediments, bioclastic terragenous and less widespread and sediment types of volcanic activity and hydrothermal vents. Sediment can also be classified as pelagic or deep-sea sediments. If you look at the sediments terragenous first, these are the result of the erosion of continental rocks. The material eroded is deposited on the continental shelves by runoff or other physical actions and progress of the continental shelf seaward sediment deposition. submarine fans can be for example, the giant fans of the Ganges and the currents move over time sediments of the continental shelf and the abyssal plain. For Therefore, this brief analysis of the sediments terragenous is useful as they do finally enter the discussion in our mission. The ocean moves the bulk material in turbidity currents and there are occasional sudden movements such as the 1929 Grand Banks turbidity event in North America. bioclastic sediments are the result of the activity biological and include the dead remains of pelagic plants and animals that have collapsed. bioclastic sediments also called pelagic oozes and can be composed by calcareous materials or silaceous.

calcareous ooze is composed of calcareous remains of foraminifera and pteropods, and form the clay color dark red ocean. Silaceous material is derived from the shells of radiolarians and diatoms and are found mainly in tropical and polar seas. Reflects the distribution of exudate primary production taking place near the surface. The thickness of the sediments also reflects the age of oceanic crust with thickness increasing as we move of the mid ocean ridges, for example. The volcanic ash eruptions also can travel long distances and finally to be deposited on the ocean floor contributing to the sediments. Finally around hydrothermal events have only metal sludge sediments. It is also noted that the sediments in the plains abyssal not completely static and currents, earthquakes and tectonic activity can move. The understanding of sediment in the deep sea environment is fundamental when it comes to life in this region. Deep Sea deep-water conditions isolated from the effects of wind below the Ekman spiral, which only influence up to 100 meters.

However, surface changes can lead to deep-water circulation to changes in temperature, density and salinity. Cold, dense water sinks and moves very slowly along the deep ocean, which require hundreds of years to move across an ocean basin. There is no daily or seasonal variations, and this effectively creates a very stable environment.

Below 3,000 meters in the area is effectively isothermal except areas around hydrothermal vents. The regions discussed in this essay are primarily bathypelagic zones and Abyssalpelagic, so here the waters are obscure, limited food, cold and great pressure. For each 10 meters in depth the pressure increases one atmosphere for what we are discussing pressures from 200 to 600 atmospheres or more in our region and the average sea depth is 4,000 meters and in some cases is 11,000 meters from the trenches. A review of deep-water conditions will be a vital support to our section of life in the water life through funds in the deep sea environment despite the apparent difficulties and challenges of life in the vicinity of deep-sea organisms have been able to exploit these regions.

Let's take a look at some of the main groups of people, some the difficulties they face and, finally, some of the adaptations that have evolved to cope with life in the deep sea. We first briefly discuss the presence of microorganisms in the deep sea. In fact most of the organisms in the deep sea are microorganisms. These microbes are able to tolerate high pressure (Barotolerant) and others actually depend on high pressure (barophilic). In the Marianas Trench is barophiles extreme.

Most of these microbes are also ie psychrophilic who like the cold. The bacteria in these levels have been adapted enzymes and membranes. However, there is still much research done in this area and the results can sometimes be inconclusive or at least very surprising. For example, in 1996, the Japanese submersible Kaiko collected mud from the bottom of Challenger Deep in the Marianas Trench and when the thousands of bodies were none of them were examined barophilic, halophilic or thermophilic acidophilic but surprisingly alkaliphiles and even so we must be careful in making the generalization in the abyssal zone. However, other samples taken at the same time resulted in the successful isolation barophiles some gender-related extreme Shewanella and Colwellia Moritella.

However, as we shall see not only the microbes living in these areas. The animals of the deep-sea environment at sea is the home of most animal phyla, but changes in the abundance of different animals with increasing depth. Research in the Kuril-Kamchatka shows that sponges are dominant up to 2,000 meters, but that focus on the deeper regions. Sea cucumbers are animals commonly found below 4000 meters and polychete worms are a large percentage of animals that inhabit benthic or bottom. The seapigs sea cucumbers (Holothuroidea) are often the most common animal in the dredging depth. Seapigs have captured at 10,000 feet deep in the Kermadec Tench. These feed plowing deep-sea mud and digesting bacteria and organic matter. Some can swim over the mud though. Starfish have been found up to 7,000 meters. Brittle and basket stars (Ophiuroidea) are located. Small crustaceans such as amphipods and isopods, and mollusks (like clams) and sea anemones have been found at great depths. There were relatively few crabs and fish found in these depths, but this may have been more to do with the sampling methods used.

In the deep ocean deposit feeders dominate with sea cucumbers and worms in deeper levels. In fact, there are many species of small infaunal animals here. Some estimates estimate about a million species of benthic invertebrates in deep-sea sediments. This shows why the previous review of the sediment is so fundamental to a discussion of the deep ocean environment. However, the number of animals those decreases from the surface to the deep abyssal trenches. He said there were relatively few crabs and fish that are found at great depth, but are represented.

Three species allows us to take as examples. First place a fish that is often ignored by his rivals the most spectacular – rattail fish or fish Grenadiers. This is called benthopelagic and demersal because they swim just above the bottom. This relationship of cod is, in fact, the most common fish found in the deep ocean. The deepest observed rat tail life up to 6500 meters. These belong to the family Macrouidae have large heads and slender bodies and feed on both hunting and collection of waste. They are being fished commercially.

Secondly we have to fish Axe (Argyropelecus olfersi) They are camouflaged with silver bodies, a flattened body contour and Candle reduction that match the light downward and are therefore difficult to see. Seek water above their tubular eyes. Let us consider these adaptations next section. Thirdly we have the lantern fish (Ceactoscopelus warmingii), which are about 5 to 15 centimeters long, with numerous photophores and migrate all up day for food. We have space here to discuss only some of the many species in deep-sea environment. Other species such as sea urchins sea, crinoids, tripod fish, gulper eels, sponges and seapens. Some are permanent residents in this environment, such as deep sea cucumbers and other visitors to our region as the Greenland Shark (Somniosus microcephaly) down to 2,200 meters and the six Hexanchus gills up to 2,500 meters, but all have some adjustments to cope with deep-sea environment.

These and other adaptations to life in the deep sea environment will now be discussed in more detail. deepwater challenges animals and their adaptations allows us to select the five major categories to discuss the following: the adjustments to the pressure, temperature, availability food, lack of light, and reproduction. Pressure and temperature animals adapt to the pressure in a variety of ways, including sperm whales have lungs that can be compressed to 1% of its normal volume, reduced skeletons rape and other fish have reduced muscle mass. Sea cucumbers have a body made up of water and other proteins and enzymes adapted to work under pressure. Sharks have fatty liver in place of the swim bladder to face extreme pressure. It is also difficult to produce calcium carbonate shells due to temperature and pressure problems. As the pressure increases and temperature decreases carbonate becomes soluble calcium which makes it difficult for the creatures that secrete shells. The depth where there is no calcium carbonate is called the carbonate compensation depth CCD.

Today the Convention in the Pacific ranges from 4,200 meters to 4,500 meters deep in the Atlantic than 5,000 meters deep. Many species have dispensed with the formation of skin below the carbonate compensation depth. Thus we see that there are chemical and physiological adaptations to cope with increased pressure. Second is a brief discussion of the temperature. The sea is largely stable isothermal temperatures force needed adaptations. Hydrothermal vents are an exception to this rule and we will discuss this in more detail later in the thesis .. The availability of food terms food availability means that there are many adaptations animals use to cope, from the behavior of predators and scavengers, feeding opportunistically whale carcasses in the vertical migration strategies.

Let's look at this in more detail now: Basically, the availability of food decreases with depth as well as species diversity. The food supply depends on the high primary production in the photic zone (with the exception of the ventilation areas hydrothermal). However, it is estimated that only 2% of the phytoplankton sink to the bottom, since they are mainly consumed above or at the bottom. Since food relatively few marine organisms have a number of ways to cope.

Which can be loosely categorized these as: 1) energy conservation adaptations, such as slow movements, slow metabolism, and some fish with a relatively low muscle mass compared to fish in shallower seas. 2) Related the conservation of energy are ambush predators such as fish, deep sea angler fish, using bioluminescent lures. 3) are dwarfism and gigantism methods of dealing with the availability of food for example, a small nematode worms and amphipods extremely large (up to 28cm) in the other. 4) The physiological adaptations also include distended stomachs and hinged jaws in some species to cope with the rare possibility of food e, g, anglerfish and gulper eels but even bivalves in the deep ocean has been found to have more value to maximize the availability of food. 5) In connection with the opportunistic feeding, but perhaps in a class of its own that animals have adapted to feed on dead whales. These are very important and provide the source of many years of food to an area of ocean floor at a time. 43 species have been found in a whale carcass for example, sharks, lampreys, bony zombies eat worms, snails, barnacles, clams and anaerobic bacteria. Since there are many similarities with the organisms found around hydrothermal vents these channels may have acted as a reinforcement for ventilating air stones. 6) deposit feeders. From the bottom of the deep sea is dominated by biogenic ooze slightly packed is dominated by deposit feeders such as sea cucumber deep (Scotoplanes). Deposit feeders can make up to 80% of the species on the seabed. Most seabed is covered with soft clay or mud, oozing fact small marine animal skeletons and fecal material. The sludge in the gap may reach several hundred meters thick. Some animals walking on the bottom have very long legs to avoid stirring the mud up such deep-sea spider. These are not real spiders but belong to the pycnogonids. Other species grow anchored to the seabed and have long stems to keep clear power structures of the Ooze. 7) migration vertical. Some move up to feed the fish and swim bladders have been replaced with fatty deposits in order to cope with the large differences in pressure.

Rattail fish above is a good example of this journey up to 1,700 meters up in a night to feed. This is just a brief cross section of the ways in which animals from the limited food supplies. The lack of lack of light from the light, perhaps creates some of the most interesting adaptations. Fish eyes in the deep sea generally tend to be larger than their counterparts above, but below 2000 meters of new eyes grow small or absent. Eyes contain a higher density of rods in the retina or tubular eyes are common hatchet fish for example. When the eyes are useless in total darkness have been developed other methods to detect the environment. well developed lateral lines to sense vibrations and antennas can also be used for example in the angler fish hair.

Bioluminescence is another port from 60 to 70% of deep-sea animals have this ability. Organs called photophores, sometimes using bacteria as a source of light is found in many fish such as lantern fish. or simple photophores produce light or to retain the light-producing bacteria such as Vibrio and Photobacterium in a symbiotic relationship. Since the bacteria produce light continuous host animals develop ways to control such emissions, reflective layers, fins and lenses. Squid has the most spectacular skills in this area. Bioluminescence can be used as a lure for food or defense. Areas Candle in the rape are for lures. The hatchet fish using light to camouflage the squid and the defense as an unexpected burst of light can distract an attacker.

Since the dominant sense in the deep sea is the audience you should discuss this in a little more detail. Many invertebrates detect the sound of the cilia. Fish detected by sensory hairs on the body of the otoliths in the inner ear. lateral line systems also allow fish to detect vibrations sound, movements of the dam and fish in schools and changes in ocean currents. Animals from around the hydrothermal vent systems may rely on this for avoid the grids themselves, but we will return to a discussion of the vents later. If we take the view that there is also a variety of systems use. They are relatively simple systems, such as worms eyespots polychete a spherical lens systems of fish allowed to have light perception beyond man's capabilities, as mentioned above.

Then one must consider the sense of orientation in marine animals. Several species can detect the pull of gravity known as statocysts bodies. In vertebrates the semicircular canal in the ear performs this function. Then chemoreception we cover the senses of taste and smell. The sense of smell (smell) is very well developed in the sharks. and they venture into the regions we are discussing. Electroreception otherwise used by sharks and some other predatory fish that have electrosensory organs. These sharks are known as ampullae of Lorenzini.

Finally, there is the sense of the magnetite crystals magnetoreception and found in fish that allows them to travel long distances. Much research remains to be done in this area, too, especially in relation to deep sea species. Finally we Reproduction adaptations in reproducing the high seas with large egg yolks to combat food shortages, the long-lived species with slow sexual maturity can also help in this area. The relative difficulty of finding isolated peers also may have led to a high degree of hermaphroditic behavior. For example tripod fish have both bodies male and female sex. The tripod is unusual in that male and female bodies can reach maturity, while allowing the fish to fertilize their own eggs. Perhaps it is so sparsely distributed that a fish can not find a mate at the right time. Adaptation famous men tiny parasites in fish Fisher is another adaptation of this isolation. The tiny clips in the female and male is still partially absorbed by guaranteeing a source of fertilization in the right time. deep-water species tend to be slow growth, late maturity, low reproductive capacity. Many species of deep-sea fish live 30 years or more and the orange roughy can live to 150 years. These are just some of the adaptations to the deep sea. If we look in more detail in certain unique communities in the deep-water environment can be seen other adaptations A note on hydrothermal vents and hydrocarbon systems Leaks Hydrothermal vents are a unique example of the community. These have been of interest since the discoveries actually Alvin in 1977 in the Galapagos Rift.

Develop systems of hydrothermal vents in the depths of several kilometers in the ocean in mid-ocean spreading centers where there is upwelling of hot lava. Seawater filtered and again expresses to high temperatures, full of minerals, either as hot filters, white or black "smokers." white smokers are just slightly cooler than in black smokers because they are rich in zinc have a white tint. The animals here must have a unique set of adaptations. Because they are very away from the photic zone dwellers depend on bacteria such as Beggiatoa chemosynthesis to produce food for caustic compounds such as hydrogen sulfide. These bacteria sometimes forming mats around vents and turn by grazing limpets and gastropod mollusks. Other communities of bacteria live in symbiosis with Giant tube worms (Riftia pachyptila), for example. Riftia can grow up to 1.5. meters long and have unique adaptations to the environment in which deep water can carry oxygen and hydrogen sulfide in the blood to supply the bacteria. Clams (Calyptogena magnified) near the ventilation systems have technical similar.

Until now, scientists have discovered more than 236 species throughout the ventilation system. 223 of these were new to science and many them endemic to ventilation systems. More ventilation systems have been explored for example, hole to hell and the hanging gardens of Pacific Ridge East, the Snake Pit in the Mid-Atlantic Ridge and the Rose Garden at the Galapagos Rift Zone. How these species developed and extended from one system to another is a matter of interest and one theory suggests that whale carcasses can be used as a first step.

There are also many theories about how life could have arisen around these vents and, in fact, these areas, but may have been developed for the first time in photosynthesis because there a faint haze around these vents. There are animals here with extreme UV sensitivity and the large shrimp with a massive number of photoreceptors in their vent systems eyes.The are very dynamic and unstable environments, but are supported only adapted communities of marine life are an important part of the debate, the deep-water environment In addition to this perhaps we should also consider another unique atmosphere that is deep water, hydrocarbon filtered. These come in our study because some of these through more than 2000 meters deep.

marine hydrocarbon seeps are cold (unlike hydrothermal vent activity) and have two main sources, biogenic (bacterial production of gas) and petrogenic ie refers to deposits underground oil leaking to the surface. Some gases are filtered arise from CH4 hydrate dissociation, water ice is stable at great depths and low temperatures. hydrocarbon seepage produces asphalt volcanism, brine pools, gas hydrates and authigenic carbonates. Oil leaks are a feature in the Gulf of Mexico and we know from research conducted at the site of Chapopote what minerals are involved. According to a study by the University community Texas chemosynthetic fauna that depend on oil and gas seeps have been found in more than 45 sites in the Gulf of Mexico so far up to 2,200 meters below the sea level.

The dominant fauna consist of species within four groups: tube worms, mussels filter, clams epibenthic and infaunal clams. The development of these communities is closely linked to geological and geochemical processes of filtration. The temperatures ranged from 5 to 9 degrees Celsius. All the consequences and the importance of both hydrothermal vents and hydrocarbon seeps has perhaps not yet been sufficiently researched account or completely, but it is fascinating and vital elements of deep-sea environment. Conclusion We have briefly discussed the ways geology, sedimentation, water bodies and life and their adaptations to the deep sea environment. Until relatively recently the importance of the environment to humans has been little studied and may not be considered particularly important for the future of man on Earth. In this summary to be played in seven key areas that have selected to link the deepwater environment of the future of man.

The first issue relates to biodiversity. Of the approximately 500,000 to 10 million species living in the deep sea, most are still discover. There could be no clearer illustration of the value of world environments at sea. Approximately 98% of the world's species live in or just above the bottom the sea. (This includes some areas strictly outside our jurisdiction). Many of these species are associated with seamounts, for example. However, the environments only home to an impressive variety of species with high levels of endemism. Each trench not sampled, and filtered ventilation is a potential source for many species undiscovered. In addition to two-thirds of all known coral species live in waters that are deep, dark and cold, up to 3000 meters deep, which belongs to our discussion area. Some of these cold-water corals are aged 5 to 8.000 or higher and 35 meters. These and other organisms that form the habitat provide protection from currents and predators, nurseries for young fish, and feeding, breeding and spawning areas for hundreds of thousands of species and therefore are a fundamental feature of biological diversity of land.

Second, we must consider feeding the world increasingly larger population. Commercially important deep-sea fish and shellfish populations are found at sea including crabs, shrimp, cod, cod Pacific, orange roughy, armorhead, grenadier, Patagonian toothfish (also known as Chilean sea bass), mackerel, snappers, porgies, sharks, groupers, rockfish, Atka mackerel and black cod.

Third, we have medical applications and implications of deep-sea environment. For example gorgonians produce antibiotics. Compounds found in certain deep-sea sponges are potent anti-cancer agents and immunouppressive. In addition, some corals contain pain killing to compounds known as pseudopterosians. Sea fans posaglandins contain high concentrations used to treat the disease of asthma and heart.

Our fourth point energy and mineral resources. The environment of deepwater ports untapped deposits of oil, gas, and many minerals. Seismic studies have detected so far only a fraction of available reserves. A resource-hungry world will need to exploit these reserves at some point in their future and the more we know on deep-sea environment, the better we can use these reserves and is expected to reduce the impact.

Fifth, we must consider the relationship between the medium deep-water environment to our immediate environment. At first it seems that there is little direct connection between the deep ocean and our own world. However, according to a study Indiana University, the deep-sea hydrothermal vents may play an important role in regulating the balance of temperature and chemistry of the oceans. Before the discovery of scientists believe that hydrothermal vents, the chemical balance of the oceans was determined mainly by runoff from continents. Now hydrothermal vents (and oil filter) is considered important influence. In fact, the university describes the hydrothermal circulation systems with wide ranging effects. Effects of pollution and deep circulation systems of the sea are of vital importance to understanding the Earth's environment.

Sixth, we must take into account the importance in scientific terms of deep-sea environments. Discovery is an untapped treasure and resources. For example former deep-sea corals provide valuable records of weather conditions that can help our understanding of global climate change. Studies of this environment are contributing to almost all branches of the science of weather to search for the origins of life itself and in fact the sea is often seen as an extreme environment comparable to the prevailing conditions on other planets. Finally we will always be aware of the commercial attractions of the deep. These commercial considerations ranging from the exploitation of hydrocarbon reserves, mineral reserves, deep sea fishing for deep-sea communities, particularly corals and sponges are sources of untapped natural products with enormous potential as pharmaceuticals (see above) enzymes, pesticides and cosmetics. When harvesting the environment deep water in a responsible manner can contribute to a more balanced and prosperous world, but overexploitation can cause global chaos. For all these reasons, understanding of deep-sea environment is essential for the future of humanity.

Dr Simon Harding

www.biblon.com

Sources Deep Sea Conservation Coalition

Indiana University research on hydrothermal circulation studies at the University of Texas oil leaks

Monterey Bay Aquarium Research Institute

New Scientist

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