You're quite correct in that the impact varies depending on the benthic community in question. Most benthic communities have old-growth species on the bottom. These are things that don't pick up after five or 10 years. They take a long time to grow. They're nursery areas. They're biodiversity in their own right. It's bit like taking an air balloon and dragging it through the forest, and then picking out the deer from what you've hauled up. It's almost that type of analogy for many ecosystems. In many of the rich ones, we don't even know what we've lost, because—
On November 23rd, 2017. See this statement in context.