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Amanda Millay Mallory Millay Scott Begins Thomas Osterman
Amanda Millay Mallory Millay Scott Begins Thomas Osterman

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... Salmon are anadromous fish, fish that come from the ocean to spawn in freshwater streams. Salmon are born in freshwater streams; they then migrate to the oceans, where most of their growth occurs. They return to their home streams, spawn and die. In a way, salmon are transporting resources from the ...
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... drives winds and ocean currents, which transport heat throughout the biosphere • Wind forms because warm air near the equator rises and cool air over the poles sinks towards the ground • Ocean currents form because cold water near the poles sinks and flow along the ocean’s bottom and rises in warmer ...
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Ecology - Arp ISD HOME

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... such as small plants, mosses and lichen, towards its climax community, which is the stable, full grown variety of species characteristic for its biome. There are two types of ecological succession – primary succession and secondary succession. In primary succession, an ecosystem starts from nothing ...
Ecology
Ecology

... three main forms of fixed nitrogen: ammonia, nitrate and nitrite. Lightning in the atmosphere fixes some nitrogen. Artificial nitrogen fixation: the industrial production of fertilizer, is also an important factor. Most living organisms keep nitrogen in fixed form. However, denitrifying bacteria con ...
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Human impact on the nitrogen cycle



Human impact on the nitrogen cycle is diverse. Agricultural and industrial nitrogen (N) inputs to the environment currently exceed inputs from natural N fixation. As a consequence of anthropogenic inputs, the global nitrogen cycle (Fig. 1) has been significantly altered over the past century. Global atmospheric nitrous oxide (N2O) mole fractions have increased from a pre-industrial value of ~270 nmol/mol to ~319 nmol/mol in 2005. Human activities account for over one-third of N2O emissions, most of which are due to the agricultural sector. This article is intended to give a brief review of the history of anthropogenic N inputs, and reported impacts of nitrogen inputs on selected terrestrial and aquatic ecosystems.
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