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Ecosystems - Devon Siegel das257 Assignment 4 Ecosystems...

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Devon Siegel – das257 Assignment 4: Ecosystems Part 1: The Cayuga Lake ecosystem has many biotic and abiotic factors. The biotic factors include the plants, animals (mostly fish) and microorganisms that live in/on the lake. The abiotic factors include the soil, rocks, water and the following physical attributes of the lake: surface wind, water currents, water temperature, depth and the water pressure associated with each depth. There are numerous matter and energy exchanges in the Cayuga Lake ecosystem. The sun and other aspects of the weather affect the water temperature and surface movement. The plants that live in the lake absorb sunlight for photosynthesis. They also absorb nutrients from the soil and water. The animals in the lake indirectly use the sunlight by eating the plants that use it to for photosynthesis. Heat is continually added and taken away due to the Lake Source Cooling project. This continual temperature change creates currents in the water which animals and other things can use to move about the lake. One of the main interactions in Cayuga Lake is between the temperature gradient of the lake and the plants and animals living in it. While some plants and animals can live in a large variety of temperatures, most have a fairly narrow temperature range that they can thrive in. The species of plants and animals that can be found change distinctly as the water gets colder with depth. The temperature gradient also interacts with nutrient and mineral concentrations, changing the nitrate, phosphate, oxygen and nutrient concentrations. The food chain of the lake is another major set of interactions and interdependencies. Certain animals depend on specific plants or animals for food, which depend on other plants or animals, and so on. This creates a highly connected web of connections. An example of an allogenic change in the Cayuga Lake ecosystem is changes in the phosphate levels. This change is due to the actions of people around the lake. There are many
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