How would life in the ocean change if the area of all regions of upwelling decreases?

If the area of all regions of upwelling decreases then there will be a drastic reduction in the nutrien- rich upwell water that stimulate the growth and reproduction of primary producers, this will lead to reduction in the level of primary productivity and thus reduction in fishery production.

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce

What's the question?