Coastal upwelling often occurs at sites of the most productive marine fisheries.However, production in these fisheries may vary greatly from year to year, depending on the strength and location of the upwelling.Which factor would be most likely to affect year-to-year upwelling, and therefore fishery production?
A) Coastline topography
B) Underwater topography
C) Wind strength and direction
D) Species of fish in the ecosystem
E) Presence of phytoplankton blooms

Question

Quizplus · Accepted Answer

Year-to-year upwelling and fishery production are primarily affected by wind strength and direction. Wind direction determines the direction of surface currents, which can influence the upwelling of nutrient-rich deep waters to the surface. Wind strength is also important, as stronger winds can cause stronger upwelling events. Coastal and underwater topography can influence the location and strength of upwelling, but typically do not vary greatly from year to year. The presence of phytoplankton blooms may indicate productive waters, but they are not the primary drivers of upwelling or fishery production. The species of fish in the ecosystem may be affected by changes in upwelling and production, but they are not the primary factors driving these changes.

Coastal Upwelling Often Occurs at Sites of the Most Productive