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ANALYSE the biophysical interactions that contribute to the unique characteristics of intertidal wetlands and EXPLAIN the impact of humans on the intertidal wetlands

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Year 12 GEOGRAPHY Assessment Task Ecosystems At Risk Case Study Task 2: Using the notes, the textbook, class notes and other sources complete the following question: ANALYSE the biophysical interactions that contribute to the unique characteristics of intertidal wetlands and EXPLAIN the impact of humans on the intertidal wetlands. The biophysical interactions that contribute to the unique characteristics of intertidal wetlands will be discussed below as well as geographical termination, and the impact of humans on the intertidal wetlands. The biophysical environment is made up of four components: Atmosphere: The interactions of the atmosphere with other spheres in the intertidal wetlands include, but are not limited to, the hydrosphere's contribution via high humidity levels; the lithosphere's soil profile contributing to the creation of gases, such as nitrogen; and the biospheres contribution of bacteria that are integral to the processes of hydrogen sulfide gas creation in the soils in the mangroves ecosystem. Hydrosphere: The interactions of the hydrosphere with the other components of the biophysical environment in intertidal wetlands include, but are not limited to, the atmosphere contribution of gases that are found in water, especially high dissolved oxygen levels; the lithosphere's soil movements, which contribute to the often high turbidity present in the water coming into the wetlands and the biospheres contribution of organic materials which ads to the store of nutrients. ...read more.


The high levels of humidity found within wetlands are an example of the interaction between the atmosphere and hydrosphere. Any alteration to water flows will affect humidity levels. The interaction between the atmosphere and the lithosphere includes the hydrogen sulfide produced by the water-logged soils of the mangrove ecosystem. Hydrosphere: The straightened and mainly concrete-lined storm water channel of Powells Creek is an example of the way which the levels of dissolved oxygen can be altered by modifications to the hydrosphere. Water loses dissolved oxygen when it absorbs heat from the concrete walls and base of the channel. Urban and industrial land uses with in the Powells Creek catchments have contributed to increase levels of turbidity. Toxic chemicals and oil spills from vessels using Sydney Harbour are another constant threat. Lithosphere: The construction of bund walls changed the hydrology of the site by modifying (reducing and redirecting) the flow of water. The reduction in flow has affected soil moisture in the mangroves. This has the potential to elevate levels of acid sulphate, damaging the health of the mangroves and adversely affecting the decomposer organisms that recycle minerals essential to the functioning of the ecosystem. Biosphere: As already noted, the atmosphere gases necessary for plant and animal growth maybe be altered by pollution. The wide spread death of marine organisms with in these wetlands has been associated with the dumping of toxic chemicals in the catchments waterways. ...read more.


for the production of wood for construction and heating purposes and the harvesting of marine life. Once these resources have been used, the land is often reclaimed for agricultural, industrial and residential purposes. * Intrinsic value- the intrinsic value of wetlands has often been ignored in the human orientated exploitation of these ecosystems for economic returns. Today Homebush Bay is being protected for its intrinsic value and uses are limited to those that do not exploit disrupt the components of the ecosystem. * Heritage value- Natural areas, including wetlands are an important part of our natural heritage and can provide and insight into ways people lived in the past- especially the historical or cultural significance to past communities. * The need to allow natural change to proceed- the area protected must be large enough to allow the evolutionary process to operate as they would in nature. Although Bicentennial Park Preserved the larger standing mangrove stands on the Parramatta River, it is still to be seen whether its size and linkages, modified prior to management, will be large enough to support natural change. The existence of buffers of park land on the southern and western sides, the relatively good resources and management available to it and co-ordination to decision makers in the wider catchments may be of assistance in providing a context in which natural change is able to proceed. In conclusion, the biophysical interaction contributes to the unique characteristics of intertidal wetlands. The impact of humans on the intertidal wetlands has had both a positive but mainly negative affect. ...read more.

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