Freshwater Mussels
Mussels are a species of marine life that inhabits many of the bodies of water in the United States. They serve as an important aspect of the ecological system of the water in which they occupy. However, the number of mussels have been declining such that many are now considered as endangered species. There are a few reasons for the decline in population, including domination by a single species of mussels called the zebra mussel. Conservation has begun on mussels because of their strong environmental influence. The two groups interested in mussels involve parties that use the lakes for recreation and consider mussels as a threat to their gaming as well as ecologists that understand the domination of zebra mussels and attempt to protect the native mussels from the zebra mussels.
Mussels are in a group of invertebrate animals called mollusks. Freshwater mussels are also referred to as clams, naiads, and unionids. Mussels spend its life anchored in rivers or lake bottom sediments. The vast majority of them are found in streams. Their movement is through either muscular feet or powerful flood currents. A mussel captures oxygen and microscopic food particles in flowing water through filtration (Vermont's Freshwater WWW). Mussels continuously pump water through their bodies. Water enters through the incurrent or branchial siphon and exits via the excurrent or anal siphon (Mussel Biology WWW). This pumping process allows the mussel to filter food from the water. The food consists of detritus, organic matter found on the stream, and plankton which are microscopic plants and animals suspended in water (Mussel Biology WWW). Mussels are long lived species with some living more than 10 years. Others have been record...
... middle of paper ...
...reissena polymorpha. NAS. Prepared by the Florida Caribbean Science Center of the Biological Resources Division: http://www.nfrcg.gov/zebra.mussel/docs/sp_account.html#HDR2.
Mussel Biology. http://www.inhs.uiuc.edu/cwe/wwwtest/mussel/Pages/introduction.html
Vermont's Freshwater Mussels Uniqueness and Diversity, Now Under Siege. The Nature Conservancy of Vermont. http://tnc.org/searchtnc.html (second listing under search for mollusk).
West Coast Mollusc Culture: A present and future perspective proceedings of a California Sea Grant Workshop in cooperation with the Pacific Sea Grant College Program. edited by Rosemary Amidei. La Jolla, CA California Sea Grant College Program, Institute of Maine Resources, University of California 1988: 87 pages.
Zebra Mussel: Dreissena polymorpha. http://tnc.org/searchtnc.html (first listing under search for mollusk).
The Artemia franciscana can survive in extreme conditions of salinity, water depth, and temperature (Biology 108 laboratory manual, 2010), but do A. franciscana prefer these conditions or do they simply cope with their surroundings? This experiment explored the extent of the A. franciscanas preference towards three major stimuli: light, temperature, and acidity. A. franciscana are able to endure extreme temperature ranges from 6 ̊ C to 40 ̊ C, however since their optimal temperature for breeding is about room temperature it can be inferred that the A. franciscana will prefer this over other temperatures (Al Dhaheri and Drew, 2003). This is much the same in regards to acidity as Artemia franciscana, in general thrive in saline lakes, can survive pH ranges between 7 and 10 with 8 being ideal for cysts(eggs) to hatch (Al Dhaheri and Drew, 2003). Based on this fact alone the tested A. franciscana should show preference to higher pH levels. In nature A. franciscana feed by scraping food, such as algae, of rocks and can be classified as a bottom feeder; with this said, A. franciscana are usually located in shallow waters. In respect to the preference of light intensity, A. franciscana can be hypothesized to respond to light erratically (Fox, 2001; Al Dhaheri and Drew, 2003). Using these predictions, and the results of the experimentation on the A. franciscana and stimuli, we will be able to determine their preference towards light, temperature, and pH.
The Zebra Mussel (Dreissena polymorpha), is a small freshwater mollusk that is an invasive species. It has slowly been making its way into the United States. It has done this by showing up in lakes and in rivers. The mussels get their name due to the striped pattern on their shells. They are a relatively small species, only growing to the size of a human finger nail but there have been cases of larger (“Zebra Mussels,” 2013, para. 2). Mussels live a short life span of 4-5 years and most do not make into adulthood. They live in freshwater at depths of 6 to 24 feet. The female produces 30,000 to 1,000,000 eggs per year starting at the age of two. Zebra Mussels are free moving and can move with an external organ called the byssus (“Zebra Mussels,” 2013, para. 3). But they can be moved around by currents and other objects too. Zebra Mussels are a threat to ecosystems. They damage the natural habitat of lakes and rivers and cause negative effects to the native aquatic life. They multiply in vast majority casing a lake of food and space for other animals. And also the U.S. has spent millions on the removal of these pests from our water (“Zebra Mussels,” 2014, para. 8). The Zebra Mussel has now made its way into Colorado. Just a few has been found in the waters of Colorado but a few is enough to cause a big stir. Extreme precautions have now been put into effect to make sure that the threat of Zebra Mussels is under control.
The financial crisis of 2007–2008 is considered by many economists the worst financial crisis since the Great Depression of the 1930s. This crisis resulted in the threat of total collapse of large financial institutions, the bailout of banks by national governments, and downturns in stock markets around the world. The crisis led to a series of events including: the 2008–2012 global recessions and the European sovereign-debt crisis. The reasons of this financial crisis are argued by economists. The performance of the Federal Reserve becomes a focal point in this argument.
Janet E. Gardner , Beverly Lawn , Jack Ridl , Peter Schakel. Boston: Bedford/St.Martin’s, 2013. 250-276. Print.
Before Milton Hershey had a world wide known chocolate business, he had a small, not so well known caramel business. Milton Hershey began his chocolate making business in 1893, when his father and him traveled to Chicago to attend a big job fair (Tarshis 14), but it wasn’t until 1900 when Hershey succeed in making the first milk chocolate candy bar (The Hershey Company). Hershey attended an exhibit hall of new and amazing inventions around the world at the fair in Chicago. As Hershey walked into the exhibit hall, he was struck by a delectable smell (Tarshis 14). “Hershey was already a leading candy maker. He had created the largest caramel factory in the country, but he became convinced that the future of his business would be chocolate. At the fair in Chicago, Hershey Bought chocolate-making equipment. He had it shipped back to his caramel factory in Pennsylvania. Then he hired two chocolate makers. Soon the company was churning out chocolate candies in more than 100 shapes” (Tarshis 15).
Tedesco, Mark A. "This Fine Piece of Water: An Environmental History of Long Island Sound." Journal of the American Planning Association 69 (2003): 321. BigChalk. 9 Nov. 2005.
Sea otters (Enhydra lutris) are marine mammals capable of spending their entire lives in water. Being carnivorous in nature, they feed on sea urchins, crabs, fishes, mussels and clams. They are referred to as keystone species due to their profound impact on marine ecology. The interaction between sea otters, sea urchins and kelp forests has been studied as a model for the impact of predator-prey interactions on community ecology. Sea otters are keystone predators, whose presence has a far-reaching influence on the marine food web by affecting the populations of sea urchins, which indirectly affects the populations of kelp forests & other marine organisms. There has been a steep decline in sea otter populations due to water pollution and exploitation for furs. This has affected marine ecology adversely. It is therefore suggested that sea otters should be included in the endangered species list to protect them from further exploitation. This study focuses on the community ecology of sea otters and their impact on marine ecology. The need for their inclusion in the Endangered Species list and the implications of such an intervention are also evaluated.
Chocolate companies changed from minimal production to massive manufacturing. Thus, targeting different market segments that weren’t possible to reach due to the high cost of the good. The market was able to shift because of the industrialization process that includes several innovations, such as van Houten’s process, this allowed a broad production and distribution of chocolate that spread around the globe.
In this regard I hypothesise that altered biomechanics combined with poor neuromuscular responses in obese adult may have an association with OA. To the best of my knowledge there are no other studies that compared the knee biomechanics along with respective neuromuscular responses within non obese, obese and OA effected adult groups.
A report compiled by the U.S Financial Crises Inquiry Commission shows that the infamous global crises could have been avoided. It pointed out that failure in different financial institutions including the Federal Reserve accelerated the crises. Lehman brothers; one of the three largest investments banks in the United States has been cited in the financial crises in 2007. The bank went bankrupt and it had to be sold in September 2008 (Currie, 2010). The other two banks Morgan Stanley and Goldman Sachs had to become commercial banks where more regulation was done. The collapse of large and significant financial institutions like the Lehman Brothers propagated the economic crises. Investors withdrew over $150 billion from the money funds in the USA in two days after the collapse of the Lehman Brothers. This caused the money markets to get unstable thereby nee...
My physical health is the dimension I’ve chosen that requires a beneficial change. Within this dimension, changing my sleeping habits is my main goal. According to Hershner and Chervin (2014), irregular sleep patterns and sleepiness have a negative impact on a student’s performance, memory, and on their ability to learn
The mullet is no longer just a hair-cut, it has spawned into a species that fits in the lower hierarchy of society. A mullet, by definition, is actually Any of various stout-bodied, edible fishes of the family Mugilidae, found worldwide in tropical and temperate coastal waters and some freshwater streams. What kind of lifestyles do the mullets live and what kind of stereotype do they develop from it? There’s more to a mullet than just a definition.
The "subprime crises" was one of the most significant financial events since the Great Depression and definitely left a mark upon the country as we remain upon a steady path towards recovering fully. The financial crisis of 2008, became a defining moment within the infrastructure of the US financial system and its need for restructuring. One of the main moments that alerted the global economy of our declining state was the bankruptcy of Lehman Brothers on Sunday, September 14, 2008 and after this the economy began spreading as companies and individuals were struggling to find a way around this crisis. (Murphy, 2008) The US banking sector was first hit with a crisis amongst liquidity and declining world stock markets as well. The subprime mortgage crisis was characterized by a decrease within the housing market due to excessive individuals and corporate debt along with risky lending and borrowing practices. Over time, the market apparently began displaying more weaknesses as the global financial system was being affected. With this being said, this brings into question about who is actually to assume blame for this financial fiasco. It is extremely hard to just assign blame to one individual party as there were many different factors at work here. This paper will analyze how the stakeholders created a financial disaster and did nothing to prevent it as the credit rating agencies created an amount of turmoil due to their unethical decisions and costly mistakes.
"Food: The History of Chocolate." Birmingham Post 11 Dec. 2004, First ed., Features sec.: 46. Print
In 2008, the world experienced a tremendous financial crisis which is rooted from the U.S housing market. Moreover, it is considered by many economists as one of the worst recessions since the Great Depression in 1930s. After bringing a huge effect on the U.S economy, the financial crisis expanded to Europe and the rest of the world. It ruined economies, crumble financial corporations and impoverished individual lives. For example, the financial crisis has resulted in the collapse of massive financial institutions such as Fannie Mae, Freddie Mac, Lehman Brothers and AIG. These collapses not only influenced own countries but also international scale. Hence, the intervention of governments by changing and expanding the monetary and fiscal policy or giving bailout is needed in order to eliminate and control enormous effects of the financial crisis.