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Human impacts on ecosystems
Human impacts on ecosystems
Human impacts on ecosystems
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Westfields, a medium sized wetland region, is located on the outskirts of Limerick city and within the floodplain of the River Shannon (CAAS (Environmental Services) Ltd., 1999). Wetland regions are broadly defined within the Ramsar Convention (1971, 1), as, “areas of marsh, fen, peatland or water, whether natural or artificial, permanent or temporary, with water that is static or flowing, fresh, brackish or salt including areas of marine water, the depth of which at low tide does not exceed six metres.” Identified as some of the most diverse habitats on earth, wetlands are also under severe threat, with a “10% decrease in their area occurring worldwide between the years 1990 and 2006” (CORINE, 2006). Westfields is no exception. Known worldwide for the diverse flora and fauna, in particular avifauna, that are present, the area has seen a dramatic decrease in size from its traditional expansive domain to a present area of twenty-six hectares. Thus, this essay aims to examine in detail the biogeographic merits of these declining wetland regions in particular Westfields, record the current condition of this particular wetland, and explore potential ideas for future conservation.
Historically, Westfields was part of an interconnected wetland complex which surrounded the Shannon estuary. However typical of many other Western societies, with the Netherlands perhaps being the prime example, anthropogenic activities, in particular land reclamation severely altered portions of the wetland environment. Historical evidence reveals reclamation in certain areas of the Shannon estuary as early as the 10th century, however, such attempts were not made at Westfields until the 1830s (Healy and Hickey, 2002). In the early years of this decade, an...
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...iences, 8 (4), pp. 673--685.
Healy, M. G. and Hickey, K. R. (2002) Historic land reclamation in the intertidal wetlands of the Shannon estuary, western Ireland, Journal of Coastal Research, 36 (Special Issue), pp. 365--373.
Karatayev, A., Burlakova, L. E. and Padilla, D. K. (2002) Impacts of zebra mussels on aquatic communities and their role as ecosystem engineers. Springer, pp. 433--446.
Mitsch, W. J. and Gosselink, J. G. (1993) Wetlands, New York: Van Nostrand Reinhold.
National Parks and Wildlife Services (2012) Conservation Objective Series, Lower River Shannon SAC 002165, Dublin: Department of Arts, Heritage and An Ghaeltacht
NATURA Environmental Consultants (2001) Westfields Management Plan, Wicklow: NATURA Environmental Consultants
Office of Water (2006) Wetlands: Protecting Life and Property from Flooding, Washington: Environmental Protection Agency
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 first mitigation banking guidance was released in 1995 by the EPA and Corps of Engineers. The most recent wetland mitigation banking guidance was released in 2008. The idea behind both wetland mitigation banking and conservation banking is to provide compensation for unavoidable impacts to resources prior to the environmental impact taking place (FWS, 2003). Based on the rules set forth in section 10 of the Rivers and Harbors Act and section 404 of the Clean Water Act, wetland impacts are reduced by using the following sequence of steps: avoiding impacts, minimizing impacts, and as a last resort, mitigating for impacts. Although the Corps has enforced a mitigation policy to reg...
...n, the Louisiana wetlands are an extremely valuable asset to the State of Louisiana and the United States. The continual loss of Louisiana wetlands has the potential to have an immensely negative effect on the economy at a state and national level. Over 2 million people live in the Louisiana coastal parishes (Field et al., 1991). The majority of people living on the Louisiana coast make their living from things that are directly related to the wetlands. The Louisiana wetlands make up the largest wetland community in America and is being lost at a rate greater than the other wetland communities in the country. The suggested strategies that are being taken into consideration could be helpful but it seems that the State of Louisiana is not as concerned as it should be given the future consequences and much like climate change coastal erosion is not being taken serious.
Zebra mussels are filter-feeding organisms, They remove particles from sediments on lake bottoms. The zebra mussels process up to one gallon of water...
Zebra mussels have now found there way to the United States originating from the Caspian Sea and sought habitation, originally, in Lake St. Claire when ballast water brought them in. From there, zebra mussels have spread and have caused havoc to the environments and its biodiversity, specifically, Presque Isle. Zebra mussels are filter feeders of zooplankton and phytoplanktons, making the water appear clearer, but not cleaner. They have negatively impacted the existence of clams, walleye and several other organisms. In order to preserve the biodiversity of Presque Isle, zebra mussels must be culled and controlled. Several methods that can be utilized to achieve this goal is by chlorination, poison, scraping, etc.
The Badu Wetlands are located within the Bicentennial Park which is located in the Parramatta River Basin approximately 12km west of the CBD. It receives slightly less rainfall and higher average temperatures than that of the CBD (central business district). The latitude of Bicentennial Park is 3350’ and the longitude is 15304’ with an altitude of 0-10 meters above seas level (m.a.s.l )The average temperature of the park is a warm temperate eastern marine. The size of the park is 100 hectares with the wetland size being 58 hectares, showing that the wetlands cover more than half of the park.
Fish habitat is the underwater world which many people do not see. It is just like the world that people live. Fish and plants reproduce, eat, and live in this environment, and even face challenges such as invasive species. It is said that “Invasive species are non-native species that threaten the diversity or abundance of native species due to their uncontrollable population growth, causing ecological or economic impacts” (“Invasive” par. 1). Vegetation plays a big role for fish habitat and for a lake itself. Aquatic habitat provides living space for not only fish but also for many aquatic insects. These insects then in turn provide fish and other species of animals with food (“Native” par. 4).
Outlandishly the near by Collect Pond was meticulously documented as it served the Dutch as a fresh water supply, through British rule, to a sewer. In 1811 the pond wa...
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.
Soule, Michael E et al. “Ecological Effectiveness: Conservation Goals for Interactive Species.” Conservation Biology 17.5 (2003) : 1238-1250.
“Summary Report for: Fish and Game Wardens”. O Net Online. 2014.Web. 4 April 2014. >.
The Everglades, classified as a wetland or a "transition zone" can support plant and animal life unlike any other place. Wetlands are an important resource for endangered species and "that more than one third of the United States' threatened and endangered species live only in wetlands." Says Elaine Mao, the author of Wetlands and Habitat Loss. People have started to notice the importance and the role of wetlands like the Everglades and how they are valuable and essential for ecosystems to live. Wetlands provide so many kinds of plants, mammals, reptiles, birds, and
3) ed. "Desigh Tos." William Holbrook Beard (1823-1900 ) . N.p., 2012. Web. 7 Jun 2012. .
This paper introduces the environmental concerns of the loss of coastal wetlands. The paper will discuss the significance of wetlands and the devastation that is occurring because of human activity. Wetlands are an essential element of our environment both ecological and societal; conservation will be essential for the preservation of these precious ecosystems.
Different scales were used to compare macroinvertebrate community assembly in natural and modified habitats. At the catchment scale, 32 reaches were studies. Seventeen drained pastured grassland and fifteen drained semi natural vegetation. Hand net collections were taken at 3 minute intervals. At the patch scale, communities in undisturbed substrate were compared with communities under attack by fine sediment due to upstream erosion. Eight streams and a total of sixty stream patches were sample using a surper-sampler. At the microhabitat scale, controlled in situ conditions were used to reproduce fine sediment deposition. Three streams with low loads of sediment were examined. Sixty five total trays full of natural substrate free of animals were used. They were placed at the predetermined sites. Twenty-one trays were used as control, 23 trays were treated with fin...