Cause And Effect Essay On Crayfish

Populations of these animals either increase dramatically or decrease dramatically, e.g. the crabs that would eat these fish in 1992 had their populations increase suddenly, due to the loss of their main predator, whereas shark numbers and other predators of the fish would decrease due to lack of food. As a result, these animals will hunt other fish and decrease the population and etc, resulting in a mass increase and decrease of populations in the ocean. Some major issues surrounding overfishing are environmental sustainability, unemployment and economic loss. The questions that the issue of overfishing poses are ‘do the benefits of overfishing outweigh the disadvantages?’ or ‘how can people change the method of catch in order to provide enough food for people whilst preserving populations?’ National/Local Perspective in Hong

Could you imagine going from the warm sunny beaches of Florida to the harsh winters of Antartica? It would take some serious adaptions to be able to survive in such drastic changes. Anglerfish and polar bears have made some pretty sufficient adaptions that allows them to be where they are today. If these organisms were not capable to make such vital changes they would not be here today. The anglerfish are some harsh and scary fish, but they do what they need to survive.

A few animals that have change in order to survive are the bull shark, the igloo viper, poison dart frog, and the red bore, according to “Costa Rica Animals”. “The Bull Shark and its Fresh Out Come” states that the bull shark had the most changes in itself in order to survive, the bull shark changed itself so it can breathe in salt and freshwater. This a huge change “according to “Freshwater biologist Smith Angel”(Costa rica and its changing habitat) says freshwater biologist Smith Angel. Because the bull shark change its lungs and cells in order to breathe oxygen from both fresh and saltwater. The Bull shark will most often go into freshwater or a river in to breed and raise its pups, “The Bull Shark will going into Fresh water only for breeding, which includes raising its pups witch is down by the mother” (Costa rica and its changing habitat) says freshwater biologist Smith Angel.

Overfishing is all over the world in Antarctica overfishing is known as the catching of the fish faster than it was taken to reproduce themselves. “ I believe citizens are beginning to realize that their birthright, a healthy ecosystem, has been stolen, and they want it back.” -Charles Clover. Overfishing will not disappear if we don 't help to keep our oceans safe.

Even there, the lamprey was not very important in the food chain as it just fed on the other aquatic lifeforms. The Niagara falls had served as a natural barrier to prevent the Sea Lamprey from invading the lakes, but when the Welland Canal opened up in 1829, Sea Lampreys quickly swam to lake Ontario and started to feast. So, if the sea lampreys hadn’t found a way in, they wouldn’t currently be devastating marine life.

Wood turtles will almost always be found several inches from a stream because of the fact that they need the water to cool off. Although the wood turtle has to go into streams and rivers to cool off, it will also be found basking a lot of the time. After basking in the sun, the wood turtle’s body temperature is about 99°F.The male wood turtles are more aggressive than the female turtles are. Some of the things that the wood turtle became endangered from are, illegal collection, farming accidents, road traffic, and habitat destruction. The thing that puts them in most danger is habitat destruction.

Fish are cold blooded legless vertebrate that live in the water and breathe using their gills. Rainbow Trouts live in streams, rivers and generally cold water areas like the pacific ocean in Asia and North America. They are carnivores and have a healthy population meaning they aren 't endangered or at the risk of extinction because they have a big population but this also has a negative impact as they will be competitive in terms of their environment or food. Rainbow trout are known predators in their habitats but they are also prey for larger fish. Rainbow trouts are able to adapt to warm and cold water temperature as well as reproduce in warm or cold water temperature.

(Yancy, 2011) No sunlight can penetrate through the 1000 metres of water, rendering photosynthesis impossible, and so there is no plant life. Therefore the majority of animals in the deep sea rely on predation rather than scavenging. Many predators have large mouths with hinged jaws and long, pointy teeth which are curved inwards to trap and eat prey. Often bioluminescence is used as a tool to lure prey to the predator. A well known example of this is the infamous anglerfish (Lophiiformes).

The Cultural Effects of Coral Bleaching Located in warm, shallow waters, one species is near it’s extinction. Scientific studies has anticipated this for years, but many people do not understand the _damage this obsolescence would have on the environment. An essential animal in the ocean, coral, is, “home to 25% of all marine fish species,” according to The Reef Resilience Network, which specializes in helping save coral. Corals have very special tolerances to things like temperatures, salinity levels, and pollution, which causes coral stress, or bleaching. When bleaching occurs because of the unsuitable conditions, the corals expel the algae living in them, turns white, and dies, When corals die, thousands of sea creatures living around reefs

Tiger Sharks play a massive role in their environment and it makes them into a keystone species. If The Tiger Sharks were gone from tiger bay there would be less sea grass for organisms due to an increase in turtles and Shark bay would lose many of the organisms who feed off the sea grass. These keystone species impact their environments and habits in many ways ranging outside their direct food web. These species are important in keeping the amount of species high in their habitats and are essential in the health and productivity in each habitat. The African Elephant makes far more abiotic differences in their environment by creating things like lakes while the Tiger Shark has mainly biotic factors and many of there changes in the ecosystem are a result of them eating fish and turtles and less about them shaping the land.