Ice divers use a quadrat to study the density of creatures living on the underside of ice floes.

Ice divers use a quadrat to study the density of creatures living on the underside of ice floes. Their research has shown higher densities of amphipods and other creatures in under ice areas with more physical relief; the little holes and crevices in the ice provide habitat and protection from predators. Image courtesy of Ian MacDonald, Texas A&M University, Corpus Christi

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