Which of the following is NOT one of the areas of wetland productivity?

National parks are primarily designated for conservation and recreational purposes, aiming to preserve the natural environment and biodiversity. While they may contain wetlands, they are not directly associated with wetland productivity, which typically refers to the ecological services and resources that wetlands provide, such as habitat for wildlife and the ability to produce seafood.

In contrast, seafood, oil and gas infrastructure, and commerce infrastructure are all linked to the economic exploitation or utilization of wetland areas. Seafood production is a direct outcome of the biodiversity supported by wetland ecosystems. Oil and gas infrastructure can also be situated in or near wetland areas, affecting their ecology. Similarly, commerce infrastructure may rely on wetland access for transportation and resource management. Thus, national parks, while important, do not fit the same category as the others that directly engage with the productivity of wetlands.