USGS Scientists Find New Invasive Fish Species In Florida Date: July 1, 1998 Source: U.S. Geological Survey Summary: The Asian swamp eel, a non-native fish, has been found in canals, ditches, streams and ponds near Tampa and Miami, Fla. The species is spreading and has the capability of invading and harming freshwater ecosystems throughout the Southeast, including the already-besieged Everglades system. Share:
Nitrogen form Symbol Use in soils and plants Dinitrogen(Atmospheric Nitrogen) N2 Dinitrogen is the most common form. It makes up 78 percent of the atmosphere but cannot be used by plants. It is taken into the soil by bacteria, some algae, lightning, and other means. Nitrate NO3 Nitrate is the form of nitrogen most used by plants for growth and development. Nitrate is the form that can most easily be lost to groundwater. AmmoniumNitrogen NH4 Ammonium taken in by plants is used directly in proteins. This form is not lost as easily from the soil.
The problem is that plants can not use nitrogen in this form. For them it needs to be converted to either ammonia which is a combination of nitrogen and hydrogen or nitrates-a combination of nitorgen and oxygen. Stage Two. This is the early stage of what we might call soil. Here we add some life, specifically lichens. Lichens are a symbiotic relationship of algae and fungus. The algae has the very important role of fixing the nitrogen, changing it from nitrogen gas to a form the plant can use.