Results of the Mann-Kendall test for detection of long-term trends.

<p>Significant trends in the environmental factors, phytoplankton biomass and zooplankton abundance data (for cladocerans and copepods, sum of adults and juveniles or copepodites, respectively) are marked in bold. <i>S</i> = Kendall score, <i>p</i> = significance, <i>n</i> = number of observations.