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Transcript of continental shelf
The sunlit zone, also known as the euphotic zone, is where there is enough light for photosynthesis. The continental shelf is located here and the twilight zone. This means that there is food and plant life for the animals to survive in. About 90 percent of all marine life live here. The euphotic zone usually reaches about 600 feet down into the ocean. The euphotic zone is home to many fish like the chimaera fish, this fish is very average it has gills and fins. This is because this fish does not need to adapt to the sunlit zone. Compared to the twilight zone there is much more animals, plants, and life.
The midnight zone, also referred to as the aphotic zone, is 90% of the ocean. It is entirely dark so plants cannot survive there. Here the only light produced is from the animals themselves. The things that are living live in little cracks on the Earth's crust. Temperatures are near freezing so about 25 Fahrenheit and -3 Celsius. These living things are angler fish, tripod fish, sea cucumbers, snipe eels, opposom shrimps, black swallowers, and vampire squids.
Where is one located?
Continental shelves surround all continental boarders. There is one located in the North sea where the salinity ranges around 34 to 35 grams per litre of water.The average salinity in ocean water is 27 grams per litre. In the summer the average temperature is 17 degrees celcius and in the winter it averges about 6 degrees celcius.
continental shelf by: russell
The continental shelf is the edge of the continent that is underneath the ocean. A continental shelf is the shallow part of the ocean. Athough the continental shelf is below sea level it is still part of the continent, the end of the continent is the end of the continental shelf. The shelves take up less then ten percent but yet 90 percent of the living things dwell here. The continental stops at an area called the continental slope, this is the part where the slope descends and goes further down into the midnight zone. It is the extent of a continent and is called a shelf sea. These shelves were exposed in glacial periods. Glacial periods is when mountain ice sheets cover the Earth. This landmass is located above the continental slope and the continental rise.
The continental shelf is located where the twilight zone begins, which is approximately between 200m and 1000m. This zone is also known as the
Disphotic zone.This region is a part of the ocean where there is very little light. Only animals that have adapted to very little light can live among this shelf. The deeper the shelf the less the light. Animals that live in this zone are lantern fish, rattalk fish, viper fish, and mid- water jellyfish.
Dab fish are often found in the North Sea and considered to be very popular there. The dab fish live in very shallow areas of the ocean, but adults dab fish can survive in ocean waters up to 1000m deep. Younger dab fish can be found to live in water 1 meter deep. On average the adult dab fish can measure up to 25cm, but 40cm dab fish have been reported to exist. Dab fish are a light brown color so they can adapt by blending into the sand and other surroundings. Dab fish are also very flat so they can be hard to spot by predators. Also the dab fish like to feed on prawn fish, marine worms, molluscs and shellfish so what ever is close to the seafloor. Dab fish also feeds on plankton.
The porbeagle shark can be caught and fished in the North Sea but is very rare. This sea creature is found to be 3.7m in length and can weigh up to 230kg. porbeagle sharks can live up to 30 years. This shark is spread widely across the Earth. This shark can adapt very well to anywhere because it can change its body temperature accordingly. The porbeagle shark also has 5 gills so it can breathe very well when it is swimming at fast speeds. This creature migrates from the North Atlantic region, as well as the southern hemisphere and roams and travels all their lives and settle in a specific area. They are also known to have a playful behavior. This shark can also live in shallow areas so it can feed on fish like the dab fish.
Plankton are a group of different organisms that live in the sunlit zone. Plankton can come in all shapes and sizes like the jelly fish and ctenophora (other plankton include phytoplankton, zooplankton, picoplankton, and meroplankton). These organisms can only live in environments that light can get to. Plankton is a large and crucial part of the food chain, they provide food for many sea creatures larger than them.
Dungness also known as the cancer magister live in the shallow waters of the continental shelf. This crab inhabits in eel grass. It can grow 20cm in length and with can reach up to 25cm. about one quarter of the crabs wieght is meat. This crab is also known for easy catch and very tender meat. So this would be a very good food for hobos if they had a net in North America. This crab has 4 pairs of legs so it can move very quickly when hunted if not carefully approached. The claws are small and light so this creature can strike quickly and also conserve energy. The dungness crabs diet is usually mollusks, crustaceans, shrimp and other aquatic vegetation.
Cancer Magister means chief crab in Latin :)
Seaweed can be found all over the ocean but can be mostly seen in the continental shelf. Seaweed is also a crucial part of the food chain just like plankton. This thin green gooey object is part of the red, blue, and green algae because of all the bacteria that its built up with. Seaweed does not only grow in oceans but also in rivers and lakes. Some seaweeds are microscopic like phytoplankton and float around water until it latches on to something or gets eaten. Some can be very large like kelp, kelp can grow up to 30 meters and some can even grow up to 1 meter a day until it reaches 30 meters
Eelgrass is a light green, 1-2 meter ribbon shaped strand that is grown in sandy areas or estuaries. Continental shelves are close to some estuaries so the eelgrass can be located there. The eelgrass is also part of a family called the zostera, this family contains 15 different kinds of grass and seaweed. Finfish and shellfish are nourished in the eelgrass because it is a source of food and a habitat.
Phytoplankton are miniscule plants that float around in the water. This name is from the greek word phyton, which means wanderer or drifter. Diatoms are the most common type of phytoplankton. The phytoplankton, just like the plankton, can come in many different shapes and sizes. Phytoplankton inhabit in the sunlit zone so it can produce food with the process of photosynthesis. All animals that are small and vulnerable to larger sea creatures feed on phytoplankton. Phytoplankton is one of many at the base of the food chain. Phytoplankton uses photosynthesis, where small fish eat plankton, and larger fish eat small fish and so on and repeats itself until the base of the food chain.
Thanks for being awesome
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