Deep-sea biodiversity in the Mediterranean Sea: the known, the unknown, and the unknowable.

When the bathymetric distributions of individual species are considered ( Figure 3 ), the upper and lower depth limits are usually found to be shallower in the more oligotrophic eastern basins than in the more eutrophic western basins [87] . Despite the differences in size fractions analyzed, when taken together, these data reveal a clear trend of decreasing species richness with depth, particularly in the South Adriatic Sea.

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