Why are fisheries heavily impacted by ENSO events?
a. Upwelling ceases
b. Nutrient-rich currents are interrupted when the trade winds shift
c. Low pressure systems create downwelling events rather than the normal upwelling
d. Rise in sea level effects migration patterns
ANS: B
The northward flow of nutrient-rich waters is interrupted by warm water masses with little nutrients.
Some upwelling does still occur, but there are no nutrients to bring to the surface. Information can be
found in the section Marine Scientists Use the Logic of Science to Study the Ocean.
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