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Paper2 - Ecology 101 In the Food Web 1 A The producers are...

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Ecology 101 In the Food Web 1. A. The producers are Phytoplankton, Dead Terrestrial plant material & Aquatic Plants & Algae. These autotrophs take in inorganic nutrients, CO2 & minerals & an outside energy source to produce organic nutrients Zooplankton is a primary consumer. Being a Heterotroph it needs a source of organic nutrients & release CO2 to the atmosphere. It grazes directly on the producers such as algae or plants. The grayling & sculpin are secondary consumer & the lake trout is a tertiary consumer. The larvae of oaddis flies & larvae of chironomids the decomposers. They breakdown organic matter releasing inorganic nutrients, CO2 & minerals that are taken up by Plance once more. B. The Dead Terrestrial plant material would be eaten by the Larvae of Caodis flies & the snail. They would be eaten by the small fish & lake trout. The toxins would have higher levels the further up the food web would reach based on the large amount of intake the consumers would be eating with a high amount of toxin. The small fish & lake trout would die off directly affecting how the food web operates. C. The least abundant organisms would be the lake trout, grayling & sculpin. The producers have to populate 90% more than the 10% the consumers eat so that they can support their own community without dying off first. D. Nitrogen cycle the organisms that are responsible for fixing nitrogen from the atmosphere are bacteria in the soil. Some of those bacterias live in the nodules on the roots of legumes, plants such as peas, beans and alfalfa. Nitrogen fixation & Nitrogen gas is converted to ammonium. 2. A. By introducing the exotic beetle species C to the island, the exotic species grows exponentially, being a better competitor in a new environment because they are not controlled by predators or disease while the native species continued to be controlled as well as competing with the new beetle species. B. The population density of species C should continue to build while the other beetles will continue to decrease. Beetle C will have more opportunity for life because they have no predators and are not subject to diseases in the area.
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