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Contour plots of concentrations (in nanograms per liter of seawater) of hexadecanoic acid (a), cholesterol (b), and crenarchaeol (c) at various depths in the water column and distances from shore on a northwest-to-southeast transect off Oman in the Arabian Sea (stations 2, 4, 5, 6, 7, and 10). The black dots indicate positions where samples were collected. These data clearly reveal that marine Crenarchaeota are more abundant at greater water depths than eukaryotes and bacteria.
