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My introduction is something essential about the intertidal zone.
So, intertidal zone is the area of a seashore which is covered at high tide and uncovered at low tide. Is a harsh and unforgiving habitat, subject to the rigors of both the sea and the land. It has four distinct physical subdivisions based on the amount of exposure each gets -- the spray zone, and the high, middle, and lower intertidal zones. Each subzone has a characteristic and distinct biological community
The highest level is Spray Zone, The spray zone is perhaps more a part of the land than the ocean. It is submerged only during rare, very high tides or severe storms, but is repeatedly wetted by splashing waves and wind-blown spray. So there are some special creatures in this area, so this is the lichen, lichen always grow at the humid area, the spray zone is very fit for their growing. Next is the periwinkle snail, have you found the small creatures, is on the plants, there. This snails can live in this humid area, maybe the food is abundant here.
The second highest level is high intertidal zone, The high intertidal is flooded during the peaks of the once or twice daily high tides, and out of water for the long stretches in between. For the creatures in this area, most of them can be found because they always be washed to the shore, like the purple shoreline crab, this crab is a rare species among all the crab species, and this is barnacles, this is a small sea animal with a hard shell that sticks firmly to rocks and the bottom of boats. Finally is the blue-green seaweed, this is a kind of plant that grows in the sea to balanced the ecosystem to functional. It can produce oxygen and clean the water environment.
The third level is mid intertidal zone, The middle intertidal zone is generally submerged, except for a fairly short period during the turn of the low tide. So the creatures in this level are usually live in the ocean. This is mussel bed, which is a level that covered with mussel, it can make the shore more stable, if you dispose this level you must be careful because it you dispose incorrectly, this will cause shore land sinking below the horizontal. And this is sea urchin, a small round sea animal with a hard shell covered in sharp points. Don’t try to grab it, you hand will be destroyed badly! Just stand farther and look it. This is another species of snail, it lives in the shallow ocean area, the shape of its shell is quite different to the ordinary snail. Maybe this is the most similar one, sea stars and anemones, remember don’t touch anemones anemones has a very deadly toxin, the sea anemone hidden countless stinging cells, stinging cells in nematocyst containing barbed wire. Once encountered it, the barbed wire immediately to stab you and inject toxin. You will die all of a sudden.
The lowest level is the low intertidal zone, the lower intertidal zone is exposed only during the lowest spring tides, because this area is the nearest area to the ocean, as it, this area has the biggest quantity of creatures. Ocean is the origin of life, red algae is live in the shallow ocean area, Dungeness crab, is a kind of crab which live in the pacific coast line of the North America, and this is the kelp, a type of flat brown seaweed.
As we all know, intertidal zone is an abundant area, is an important area of purification, fish breeding and large edible crustaceans source, is also an entertainment and leisure venues and important biodiversity habitats, meanwhile it also fragile, it’s easy to be polluted by the industry and the fertilizers runs off into the water, then the algae bloom, then submerged plants die due to reduce light, after that, bacteria use oxygen during decomposition, finally the oxygen levels in the water drop too low for fish to survive. Also,some bacteria and phytoplankton in the ocean will growth rapidly and cause a natural disaster called red tide,which can make a discoloration of sea water. So how can we protect it?
In 1993, 14 intertidal protected areas were established around the Sydney as a component of an integrated management approach to minimise threats and ensure the sustainability of rocky shore animals and plants, they aim to:
·protect intertidal community biodiversity and structure by breed new species marine creatures
·provide biological reservoirs of breeding stock so exploited areas nearby can be recolonised or sustained
·help ensure harvesting of intertidal invertebrates is undertaken at sustainable levels
I think the second strategy maybe not appropriate, cause it cost to much money and time to achieve
For the above alternatives, I will choose the first strategy, because I think is the most rapid way and direct way to protect the biodiversity of the intertidal zone
(http://www.docin.com/p-426285168.html)a, the spray zone is very fit for their growing. Next is the periwinkle snail, have you found the small creatures, is on the plants, there. This snails can live in this humid area, maybe the food is abundant here.
In 1993, 14 intert