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Long-Term Trends in Calcifying Plankton and pH in the North Sea
Figure 5
Long-term trends in the abundance of calcifying plankton between 1958 and 2010.
The trends were estimated using Friedman's super-smoother in which abundance is modeled as a function of long-term trend.
doi: https://doi.org/10.1371/journal.pone.0061175.g005