What Is Responsible for Smaller Shrimp Catches?
ES2206  Seasonal Changes in Nitrate Concentration

Scientists can estimate the input of nitrates to the Gulf from the Mississippi River Basin, but once the nitrates are mixed in the ocean, are the changes in nitrate concentrations observable? The map below shows annual average nitrate concentrations at the surface. Concentration is measured in micro-molarity (µM) or thousandths of a mole of nitrate per liter of seawater.

  !   Click the buttons to see nitrate concentration for each season. Examine the maps and the color code to interpret how nitrate levels changed through the year. Focus on changes in the Gulf of Mexico.


5. Look at the maps of mean nitrate concentrations for four seasons. Describe your observations.

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