The decrease in sharks can also be detrimental to many fisheries. Sharks feed on other carnivores down the food chain. Carnivores that sharks prey on often prey on creatures such as shellfish. Without sharks, there would be an increase in several other carnivores, leading to a vast decrease in the amount of shellfish and other herbivores in the sea, which can be detrimental to local fisheries. Fishermen hunt sharks in order to sell their meat for money, however, those sharks are crucial to the survival of other desirable marine life such as shellfish, which fishermen also fish.
2005). A band of muscles that originate from the chromatophores allows the cuttlefish to change the color pattern according to its surrounding by relaxing the muscles to alter the different color layer (Chiao and Halton
Believe it or not we are all a witness of watching someone litter, or us littering. From planktons, to dolphins to birds can be affected by a simple oil spill in the ocean and especially in a close area like the Persian Gulf can cause great damage. When oil is spilled, toxins in the water spike and will shock the bodily systems of the animals living there, causing a massive amount of death and leading to endangerment. Before disaster had struck in 1991, the Persian gulf has beautiful clean beaches, filled with marine life.
72580 Rodriguez Silva The Top-down Effects of Brine Shrimp on Algae INTRODUCTION An ecosystem is a delicate structure moderated by the network of interactions between all of the organisms that inhabit it. These organisms can be arranged into trophic levels, forming a chain or pyramid in which energy flows from one level to another.
Most studies have traditionally sacrificed relatively large numbers of fish to examine their stomach contents. However, sacrificing fish for food habit studies may cause public relations issues. They may not be a convenient option if study fish which are threatened, endangered, economically valuable, or come from a low density population. Additionally, lethal methods may significantly alter the population structure of fish. Accordingly, a number of nonlethal methods were developed to obtain and analyse the gut content of fish.
However, as stocks of cod fish continued to drastically decline the government finally decided to ban cod fishing in 1992. Though the cod fishing industry boosted the Canadian economy and provided employment for local
As they usually hunt old, weak or sick prey, they help to keep the prey population in good condition, healthy and strong, enabling these more naturally fit animals to reproduce and pass on their genes. The effects of removing sharks from ocean ecosystems, although complex and rather unpredictable, are very likely to be ecologically and economically damaging. Here are some reason why killing sharks is very bad: 1)Sharks are being fished at a rate faster than they can recover. Due to overexploitation and lack of proper management, many shark species are under considerable risk of unrecoverable decline with some species having declined to near extinction in recent years.
If lionfish overtake a coral reef, they can consume over one-hundred types of species of fish. Also, the fish that lionfish consume are necessary for habitat health because they regulate algae. Lionfish have been known to exist in various new areas including Gulf of Mexico, the Caribbean, and the Atlantic Ocean (Morris, J.A., Jr., and P.E. Whitfield). Lionfish act as
Destructive fishing methods cause harm to the reefs because the dynamite and cyanide or other methods used because they break up the fragile coral reef are highly unsustainable. Unsustainable tourism generates a lot of income for the host countries, the tourists damage the coral reefs by careless swimmers and divers, and poorly placed boat anchors. Then there is also the problem with the hotels and resorts have a tendency to discharge untreated sewage and waste water into the ocean, which pollutes the water and helps the growth of algae, which makes it harder for the coral reefs to grow and expand. The growth of coastal cities and towns that generate multiple threats to the coral reefs that are nearby because with the expansion of the cities or towns there is limited space airports and other constructions projects are taking up the space that the reefs need to survive. “Coral reefs are biological assemblages adapted to waters with low nutrient content, and the addition of nutrients favours species that disrupt the balance of the reef communities” ( The International Coral Reef Initiative).
Loggerhead turtles are species generalists. Loggerheads compete with other carnivorous predators whose diets overlaps with theirs. For example, juvenile loggerheads and Kemp’s ridleys in waters around Long Island have substantial diet overlap. Interspecific competition also occurs for nest sites for beaches shared with other sea turtles species; however, this problem was likely greater in the past before modern turtle population declines. The diet of loggerheads includes many species that are harvested by humans and consequently decreases in food resources can result in sublethal effects in the form of decreased growth rates and reproductive output (Bjorndal 2003).
Jellyfish blooms are swarms that have reproduced exponentially, causing severe repercussions. Since some species of jellyfish can release up to 40,000 eggs in just one day, per jellyfish, its no wonder how these blooms can occur. These blooms can pollute the seas and waterways, as well as affect local wildlife. Over the years, jellyfish blooms have proven to be quite the serious
They have social impacts, such as their endangerment of people and domesticated pets that are unaware of the risk they pose, and the blocking of drains and fouling of swimming pools. They also pose a health hazard as they are known to feed on human faeces, which means that they can acquire human diseases, such as Salmonella, and pass them on through their eggs. They impact the economy by placing a significant strain on the financial resources of land managers because of the ongoing need for research and management. Due to the decline in bush tucker species because of cane toad consumption, such as monitor lizards, snakes and turtles can affect Aboriginal communities culturally and economically. Lastly, there are ethical issues relating to the methods of collecting, euthanasia and disposing of the toads.
As humans expand they are producing more waste and need a place for it to go. In some countries, people just pump the waste into the water, as a result it is harming the manatees. The waste that humans are pumping into the ocean is causing toxic algae which the manatee eats and it makes the sick or could kill them. The waste from humans hurts the manatee also by
Loggerhead sea turtles face many dangers including artificial lights, which contribute to their endangerment. The most prevalent way loggerhead sea turtles are being threatened is by human interaction. Humans turn on lights by the beach at night sometimes in turtle nesting season, and this can influence female turtles to avoid the beach, where they need to lay their eggs. (“Please turn your lights off, the turtles are nesting: ensuring that federal, state, and local laws help guide endangered marine turtle hatchlings in Florida to the right source of light”). However, there are some actions humans can take to help prevent endangerment of sea turtle hatchlings.