Data from: Integrating water quality monitoring and diatom community trends to determine landscape-level change in protected lakes.

These data represent water quality measurements and diatom counts from
surface sediments collected from lakes in five National Park units in the
Great Lakes Region (USA) between 2005 and 2018.  Water quality
measurements were made three times annually during the growing season;
data are presented as growing season means.  Surface sediment
samples were collected from the same lakes every 3-5 years over more than
a decade to analyze diatom community turnover.  Diatom data are
presented as proportions relative to total diatom counts in each sample;
only taxa occuring at 2% or greater in a given park were
included.