Introduction to the deep sea environment
The deep waters Environment In this essay we will examine various aspects of water environment deep. The primary 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 the bathypelagic and Abyssalpelagic areas.
Let's examine the sources of evidence for a discussion of this environment of deep water looking at some of the techniques man used to gather information there. This will be followed by a description of some of the factors determining conditions in these regions with a note on the geology, sediments, a brief discussion of deep-water masses, a description of marine life found in deep-sea environment, their adaptations and challenges of a special note on hydrothermal vents (although at an average depth of 2100 meters is only within our area of debate), hydrocarbon seeps and a final conclusion about the overall importance of deep-sea environment of mankind.
First, why study the environment of waters deep at all? The abyssal plains are dark and appear devoid of life or of interest but nothing could be further from the truth. abyssal zones represent more 90% of the benthos and over 80% of the oceans is below 3000 meters. New discoveries are being made and these could greatly influence our future.
The deep ocean is a repository of scientific information and resources that may influence the fields of medicine, chemistry, physics, biology, feeding the growing world population and conservation. The sea is actually the largest ecosystem on Earth. Let us first examine the methods collection of 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 (probe) on the side of ships, echo sounder from the First World War to the invention of scuba gear (not useful in our depths under discussion) Geology with the use of long-range inclined ASDIC (GLORIA). Sidescan sonar and seismic studies of continuous exploration gives us a great deal of information.
In addition a range of simple devices give us information, such as thermometers, water bottles and flow meters to measure the physical and chemical water dredges, corers, heat sensors and cameras to the study of bottom sediments and the lower life. However, for centuries the only evidence we had of the marine life in the depths of the sea was very low. The area we are discussing has rarely been visited. Using atmospheric diving suits (JIM), you can only compared to about 450 meters today. We need different equipment to explore the depths we are discussing. In 1964, Alvin made the first successful deep-sea diving manned submersible scientific name of Woods Hole Oceanographic Institute. Later updates have been able to dive to 6,000 meters.
Alvin was the first to discover and explore hydrothermal vents a small section of mid-ocean ridge. We return to this setting later. For depths below this we have remote operated vehicle or ROV. Cutting edge research is performed by Woods Hole OI ROV and Monterey Bay Aquarium Institute Research .. He has even visited the lowest point. In January 1960, Piccard and Walsh descended in Trieste II (a submersible) to the deepest point known in the Earth, the Mariana Trench at 10,915 meters. Despite the global shortage of evidence and the fact that the vast majority of seabed to be explored we can discuss the deep-sea environment in a dynamic way.
New discoveries are being made frequently in this area. Let us now look at the geological base of deep-sea environment. Geology The lithosphere ocean is about 100 km thick (hence significantly thinner than continental lithosphere) and refers to the crust and upper mantle. The lithosphere is composed primarily of peridotite. The top of the lithosphere is the crust which is mainly composed lighter granite rock. The oceanic crust is thinner and denser than continental crust and consists mainly of basaltic rock. The entire lithosphere (Oceanic and continental) sits at the top of the lower viscous layer called the asthenosphere, part of the upper mantle.
The lithosphere is composed by seven main courses and 6 the secondary. New oceanic lithosphere, or at least the oceanic crust is formed at constructive plate boundaries. At the bottom of the ocean ridges expansion of wells and asthenosphere 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 when it melts. The coast of Japan provides an example. It should be noted that the environment is dynamic through geological time, the subduction process destroys the ocean floor. As new ocean floor is formed as pushed to the ground on both sides and this distance can reach into a subduction zone and be destroyed. It is possible date of the oceanic crust of the plates separate and spread the abyssal plain as they acquire the polarity of Earth's magnetic field. This work has been described by Matthews and Vine.
Also in general, saying the oldest ocean crust is the further away from the spreading ridges will be. The denser material sinks also further away from the surface the sea. Given the age / relationship with the depth of the age of ocean crust can also be estimated. The main "topography" features ocean basins are perhaps half Ocean Ridge, with abyssal plain on both sides of this range, constructive plate margins or destructive plate margins with the ocean bottom at the edges of deep-sea environment with pelagic sediments covering the ground. Of course, there are many variations to this pattern but this leads to a consideration of sedimentation.
The sediments in the vicinity of the seabed in the deep sea environment is really true that only dealing with deep-sea sediments. However, there are two main types of sediment and bioclastic terragenous and less widespread types of volcanic sediment and hydrothermal activity. Sediments 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 eroded material is deposited on the continental shelf by runoff or other physical actions and progress of the continental shelf seaward sediment deposition. submarine fans can be, for example, the giant fan of the Ganges and currents move eventually sediments of the continental shelf and the abyssal plain. Therefore, this brief analysis of the sediments terragenous is useful as they do finally enter the discussion of our remit. The ocean moves the bulk material in turbidity currents and there are occasional sudden movements such as the 1929 Grand Banks event North America turbidity. bioclastic sediments are the result of biological activity and the dead remains of plants include pelagic and animals that have collapsed. sediment bioclastic are also called pelagic oozes and materials may be composed of calcareous or silaceous.
calcareous ooze is composed of calcareous remains of foraminifera and pteropods, and forms the deep sea red clays. Silaceous material is derived from the shells of radiolarians and diatoms and are found primarily in tropical and polar seas. The distribution of primary production reflects discharge taking place near the surface. The thickness of the sediments also reflects the age of oceanic crust with a thickness increases as we move away from mid-ocean ridges by example. The volcanic ash eruptions also can travel long distances and end up being deposited on the ocean floor, thus contributing to the sediments. Finally around hydrothermal events have only metalliferous sediments with mud. It is also noted that sediments in the abyssal plains are not completely static and the currents, earthquakes and tectonic activity can move. Understanding of sediments in the deep sea environment is essential when it comes to life in this region. Deep Sea deep-water conditions is isolated from the effects of wind below the Ekman spiral, which only affect up to 100 meters.
However, surface changes can lead to deep water circulation changes in temperature, density and salinity. Cold water sinks and moves very slowly dense along the ocean depths, requiring many hundreds years to move across an ocean basin. There is no daily or seasonal variations effectively and this creates a very stable environment.
Below 3000 meters of the area is effectively insulated except for the areas around hydrothermal vents. The regions discussed in this essay are mainly areas Abyssalpelagic bathypelagic and so here the waters are dark, limited food, cold and great pressure. For each increase of 10 meters pressure increases one atmosphere for what we are discussing pressures from 200 to 600 atmospheres or more in our region since the average depth of the deep sea is 4,000 m and in some cases is at 11,000 meters from the trenches. An examination of the deep water conditions will be a vital support to our section of life in the water of life half of the funds in the vicinity of Deep Sea Despite the apparent difficulties and challenges of life in the environment of the deep-sea organisms have been able to exploit these regions.
Let's take a look at some of the main groups of people, some of the difficulties they face and, finally, some of the adaptations that have evolved to compared with life in the depths of the sea. We must first consider briefly the presence of microorganisms in the deep sea. In fact most of the bodies the deep sea are microorganisms. These microbes are able to tolerate high pressure (barotolerant) and others are really dependent on high blood pressure (barophilic). In the Pit Mariana is barophiles extreme.
Most of these microbes are also ie psychrophilic conditions like cold. Bacteria in these levels have adapted enzymes and membranes. However, further research needs to be 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 many thousands of bodies were examined, none of them was barophilic, halophilic or acidophilic, but surprisingly alkaliphiles thermophiles and yet we must be careful in making generalizations in the hadal zone. However, other samples taken at the same time resulted in successful isolation barophiles some aspects related to the genera Shewanella, Colwellia and Moritella.
However, as we shall see not only the microbes living in these areas. The animals of the deep-sea environment at sea is home to most of the edges animals, but changes in the abundance of different animals with increasing depth. Research in the Kuril-Kamchatka shows that the sponges are dominant up to 2000 meters, but we focus on the deeper regions. Sea cucumbers are the most common animals 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 been taken 10,000 feet deep in the Kermadec tench. They feed by plowing deep-sea mud and digest bacteria and organic substances. Some can swim above the mud, however. Starfish have been found up to 7,000 meters. Brittle and basket stars (Ophiuroidea) are. Small crustaceans such as amphipods and isopods, and such as molluscs (like clams) and sea anemones have been found at great depths. There were relatively few crabs and fish that are found in these depths, but this may have been more to do with the sampling methods used.
In the seabed deposit feeders predominate sea cucumbers and worms in the deeper levels. In fact, there are many species of small infaunal animals here. Some estimates about one million different species of invertebrates benthic deep-sea sediments. This shows why our examination of the sediments above so fundamental to a discussion of the ocean environment deep. However, the number of individual animals decreases from the surface to the depths hadal trenches. He told us that there were relatively few crabs and fish are deep, but they are represented.
Let's take three such species. First, a fish that is often ignored by his rivals Spectacular - The Grenadier fish rattail fish. This is called benthopelagic and demersal because they swim just above the bottom. This relative of cod is, in fact, the most common fish found in the deep ocean. The deepest observed rattail lives up to 6500 meters. These belong to the family and have large heads Macrouidae and tapered bodies and feed by hunting and scavenging. They are being exploited commercially.
Secondly we have the fish Axe (Argyropelecus olfersi) They are camouflaged with silver bodies, a flattened body shape and photophores reduced to match the light downward and are therefore difficult to see. Looking for the waters above with tubular eyes. Let us consider these adjustments in the next section. Thirdly we have the flashlight fish (Ceactoscopelus warmingii), which are about 5-15 cm long, with numerous photophores every day and migrate upwards to feed. The spaces are only here to discuss some of the many species in the deep-water environment. Other species are sea urchins, crinoids, tripod fish, gulper eels, sponges and seapens. Some are permanent residents in this medium environment, such as deep sea cucumbers and other visitors to our region and the large Greenland shark (Somniosus microcephaly) down to 2,200 meters and the six Hexanchus gilled up to 2,500 meters, but all have some adaptations to deal with deep-sea environment.
These and other adaptations to life in the middle deep-water environment will now be discussed in more detail. challenges of deep-sea animals and their adaptations allows us to select five major categories to discuss as follows: Adjustments to the pressure, temperature, food availability, lack of light, and reproduction. Pressure and temperature of the animals adapt to pressure in a variety of ways for example, sperm whales have lungs that can compress to 1% of its normal volume, monkfish have reduced the skeletons and other fish have been reduced muscle mass. Sea cucumbers have a body largely composed of water and other proteins and enzymes have adapted to work under pressure. Sharks have livers fat instead of the swim bladder to cope with extreme pressure. It is also difficult to produce calcium carbonate shells due to pressure and temperature problems. As the pressure increases and temperature decreases becomes soluble calcium carbonate which makes it difficult for the creatures that secrete shells. The depth at present no Calcium carbonate is called the carbonate compensation depth of the CCD.
Today, the CCD in the Pacific ranges from 4200 meters to 4500 meters Atlantic and 5,000 meters deep. Many species have shed their shell formation below the carbonate compensation depth. So we see that there are physiological and chemical adaptations to cope with increased pressure. Secondly we have a brief discussion of the temperature. The sea is largely stable isothermal temperatures prevailing in need of some adjustments. Hydrothermal vents are an exception to this rule and we will discuss the results more detail later in the thesis .. Food availability regarding the availability of food means that there are many adaptations animals use to cope ranging from predatory and scavenging behavior, opportunistic feeding the whale carcasses to the vertical migration strategies.
Let's look in more detail now: Basically food availability decreases with depth as well as species diversity. The food supply to deep water depends on primary production in the photic zone (with the exception of hydrothermal vent areas.) However, it is estimated that only 2% of the phytoplankton sink to the bottom as they are mainly consumed above or on the way down. Because food is relatively scarce marine organisms have a number of ways of coping.
We vaguely These can be categorized as: 1) Energy conservation adaptations, such as slow movements, slow metabolism, and some fish with relatively low muscle mass compared to fish in shallower seas. 2) Related to the conservation of energy are some ambush predatory fish such as deep-sea anglerfish, using bioluminescent lures. 3) The dwarfism and gigantism are methods to deal with the availability of food such as small nematode worms at one end and amphipods large (up to 28 cm) in the other. 4) The physiological adaptations also include distended stomachs and hinged jaws in some species to cope with the possibility of rare cases of food and, g, anglerfish and gulper eels but even bivalves in the deep ocean has been found to have the courage to make and maximum food availability. 5) In connection with this food fit, but perhaps in a class of its own that we have the animals adapted to feed on dead whales. These are very important and provide a food supply for many years 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 to organisms found around hydrothermal vent these channels may have acted as a step stone for the evacuation vent. 6) Deposit feeders. From the bottom of the sea depth is dominated by biogenic compacted whitewash it is dominated by deposit feeders such as sea cucumber deep (Scotoplanes). Deposit feeders may make up to 80% of the species at the bottom of the sea. Most of the seabed is covered with soft clay or mud and oozes fact tiny skeletons of marine animals and fecal material. The mud in the gulf can be several hundred meters thick. Some animals that walk by the fund have long legs to avoid stirring the mud up eg deep sea spider. These are not true spiders but belong to the pycnogonids. Other species grow anchored to the seabed and have long stems to maintain clear power structures of mud. 7) The vertical migration. Some move up to feed the fish and have replaced the air sac, with deposits fat in order to cope with the pressure differences.
Rattail fish mentioned above is a good example of this journey up to 1,700 meters a night to feed. This is just a brief cross section of the ways in which animals from limited food supplies. The lack of light as the lack of light turn creates one of the most interesting adaptations. The eyes of the fish in the deep sea generally tend to be larger than their counterparts above, although 2000 meters below the eyes again grow smaller or absent. Eyes contain a higher density of rods in the retina or tubular eyes are common eg hatchet fish. When the eyes are useless in total darkness have developed other methods for detecting the environment. The side lines are well developed for feel the vibration and antennas can also be used for example in the hairy anglerfish.
Bioluminescence is another adaptation to 60-70% of water animals deep has this ability. Organs called photophores, sometimes the use of bacteria as a source of light is found in many fish such as lantern fish. simple photophores either produce light or retain the light-producing bacteria such as Vibrio or Photobacterium in a symbiotic relationship. Since the bacteria produce light continuously the host animals develop ways to control emissions such as reflective layers, flaps and lenses. Squid has the most spectacular skills in this area. Bioluminescence can be used as a lure for food or for defense. Areas of photophores in the rape are for decoys. The hatchet fish using light to camouflage and squid for defense as an unexpected burst of light can distract an attacker.
Since the dominant sense in the deep sea is the audience we should discuss this in a little more detail. Many invertebrates sound detected by the cilia. Fish detected by the sensory hairs on the body of the otoliths in the inner ear. Line lateral system also enables the fish to detect sound vibrations, movements of the dam and fish in schools and changes in ocean currents. Animals around the hydrothermal vent systems can build on this to avoid the vents themselves, but we will return to a discussion of more vents later. When we consider the view that there are also a variety of systems in use. There are relatively simple systems, such as worms polychete eyespots systems spherical lens of the fish that allow them to have a perception of light beyond the capabilities of man as mentioned above.
Then one must consider the sense of orientation in marine animals. Several species can detect the pull of gravity with the bodies known as statocysts. In vertebrates semicircular canal in the ear performs this function. Then we chemoreception covering the senses of taste and smell. The sense of smell (olfaction) is very well developed sharks. and these they venture down into the regions we are discussing. Electroreception is another sense 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 magnetoreception and magnetite crystals found in fish that allows them to travel long distances. Much research remains to be done in this area seems, especially in relation with deep-sea species. Reproduction Finally we have the adjustments in the reproduction on the high seas with large egg yolks to combat the lack of food, species long lived with low 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 male and female sexual organs. The tripod is unusual in that male and female bodies can reaching maturity, while allowing the fish to fertilize their own eggs. Perhaps it is so dispersed that a fish can not find a mate at the right time. The adaptation of the famous men tiny parasites in fish fisherman is another adaptation to isolation. The tiny clips in the female and male is still partly absorbed by guaranteeing a source of fertilizer at the right time. deep-water species tend to be slow growth, late maturity and 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 from the depths of the sea. If we look in more detail in certain communities are unique in the deep-water environment can be seen other adaptations A note on hydrothermal vents Oil and filter systems Hydrothermal vents are a unique example of the community. These have actually been of interest since the discoveries of Alvin in 1977 in the area Galapagos Rift.
Develop systems of hydrothermal vents in the depths of several kilometers of ocean in the mid-ocean sites expansion where there is upwelling of hot lava. The sea water is filtered and vented back to warm temperatures, full of minerals, either as warm filtered white or black "smokers." white smokers are only slightly cooler than black smokers and because they are rich in zinc are white in color. Animals here must have a unique set of adaptations. Since they are far from the photic zone depends on people such as Beggiatoa bacteria to produce food Chemosynthetic caustic compounds such as hydrogen sulfide. These bacteria sometimes forming mats around the vents and turn to grazing by limpets and gastropod molluscs. Other communities of bacteria live in symbiosis with giant tube worms (Riftia pachyptila), for example. Riftia can grow up to 1.5. adaptations meters long and have only the environment of deep water that can carry oxygen and hydrogen sulfide in the blood to supply the bacteria. Clams (Calyptogena magnifica), close to the vent systems have similar techniques.
Until now scientists have discovered more than 236 species All breathing systems. 223 of them were new to science and many of them endemic to ventilation systems. More ventilation systems have been explored For example, hole to hell and the Hanging Gardens of the East Pacific Rise, the nest of snakes in the mid-Atlantic ridge and the Rose Garden in the Rift Galapagos Zone. How these species evolved and spread from one system to another is a matter of interest and the theory suggests, may use whale carcasses as stepping stones.
There are many theories about how life could have arisen around these vents and, in fact, these areas, but may have been first developed where photosynthesis as there is a slight haze around these vents. There are animals here with extreme UV sensitivity and the large shrimp with a massive amount of photoreceptors in their ventilation systems can cause eye injuries are very dynamic and unstable environments, but they do support only adapted communities of marine life that are a part of the debate, the deep-sea environment that we should perhaps also consider another unique atmosphere that is deep water, hydrocarbon seeps. 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, biological production (bacteria gases) and this is petrogenic regards underground oil tanks leaking to the surface. Some gases are filtered arise from CH4 hydrate dissociation, ice water 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 Chapopote what minerals are involved. By A study by the University of Texas fauna chemosynthetic communities dependent on oil and gas seepage have been found in more than 45 sites in the Gulf of Mexico until now to 2200 meters below sea level.
The dominant fauna consist of species within four groups: tube worms, mussels filter, epibenthic mussels and clams infaunal. 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 seepage and perhaps not yet sufficiently account or fully researched but these are fascinating and vital parts of the deep-sea environment. Conclusion We have briefly discussed the geology, sedimentation, the body of water and life forms and their adaptations to the deep-sea environment. Until relatively recently the importance of the environment to humans has been little studied and perhaps not considered particularly important for the future of man on Earth. This summary should be extended to seven key areas you have selected that link environmental deep-water environment to the future of man.
The first issue relates to biodiversity. Of the approximately 500,000 to 10 million species living at depths sea, most are yet to be discovered. There could be no clearer illustration of the value of world environments of deep water. Approximately 98% of the world's species live on or just above the seabed. (This includes some areas strictly off our chances). Many of these species are related with seamounts, for example. However, the unique environments host an extraordinary variety of species with high rates of endemism. Each trench without sampling, hydrothermal vents and cold is a potential source of numerous undiscovered species. In addition, two thirds of all known coral species live in waters that are deep, dark and cold, until more than 3000 meters deep, which belongs to our discussion area. Some of these cold-water corals are from 5 to 8.000 years and older and over 35 meters high. These and other habitat forming organisms provide protection from currents and predators, nurseries for young fish, and food, breeding and spawning areas for hundreds of thousands of species and therefore are a fundamental feature of Earth's biodiversity.
Second, we must consider Food from around the world increasingly larger population. Commercial fish in deep waters and shellfish stocks on the high seas are included crabs, shrimp, cod, Pacific cod, orange roughy, Pentacerotidae, grenadier, Patagonian toothfish (also known as Chilean sea bass), mackerel, snappers, snappers, sharks, grouper, rockfish, mackerel, black cod and Atka.
Thirdly, we have medical applications and environmental implications deep water. For example Gorgonia corals produce antibiotics. Compounds in certain deep-sea sponges are immunouppressive powerful anti-cancer agents. In addition, some corals contain the pain killing compounds known as pseudopterosians. Sea Fans posaglandins contain high concentrations to treat asthma and heart disease.
Our fourth point concerns energy and mineral resources. The environment of deepwater ports untapped deposits of oil, gas, and minerals. Seismic surveys have been detected so far only a fraction of available reserves. A resource-hungry world will need to exploit these reserves at some point their future and the more we know about deep-sea environment, the better we can use these reserves and is expected to reduce the impact.
Fifth, we must into account the relationship of deep-sea 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 by Indiana University-sea hydrothermal vents may play an important role in regulating the temperature and equilibrium chemistry of the oceans. Before the discovery of the scientists believe that hydrothermal vents chemical balance of the oceans was primarily determined by runoff from the continents. Now hydrothermal vents (and hydrocarbon seep) influence is seen as important. In fact, the university systems are described hydrothermal circulation with a variety of effects that range. Effects of pollution and deep circulation systems of the sea are vital to understanding the environment of Earth.
Sixth, we must take into account the importance in scientific terms of deep-water environments. It is an untapped treasure of discovery and resources. For example ancient deep-sea corals provide valuable records of climatic conditions that may 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 conditions prevailing in other planets. Finally we will always be aware of the commercial attractions of the deep. These considerations ranging from commercial exploitation of hydrocarbon reserves, mineral reserves, deep sea fishing to deep-sea communities, particularly corals and sponges that are sources of untapped natural products with enormous potential as pharmaceuticals (see above) enzymes, pesticides and cosmetics. When harvesting the middle deep-sea environment in a responsible way we can contribute to a more balanced and prosperous world, but overexploitation can cause global chaos. For all these reasons, understanding the deep-sea environment is essential for the future of humanity.
Dr Simon Harding
www.biblon.com
Fuentes Deep Sea Conservation Coalition
Indiana University research on hydrothermal circulation studies at the University of Texas oil seeps
Monterey Bay Aquarium Research Institute
New Scientist
About the Author
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