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\begin{document}

\title{Long-term trends in productivity across Intermountain West lakes provide
no evidence of widespread eutrophication}



\author[1]{Samuel James Sillen}%
\author[2]{Matthew Richard Voss Ross}%
\author[1]{Sarah Collins}%
\affil[1]{University of Wyoming}%
\affil[2]{Colorado State University}%


\vspace{-1em}



  
  \date{May 23, 2024}


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\begin{abstract}
Eutrophication represents a major threat to freshwater systems and
climate change is expected to drive further increases in freshwater
primary productivity. However, long-term in-situ data is available for
very few lakes and makes identifying trends and drivers of
eutrophication challenging. Using remote sensing data, we conducted a
retrospective analysis of long-term trends in trophic status across the
Intermountain West, a region with understudied water quality trends and
limited long-term datasets. We found that most lakes (55\%) were not
exhibiting shifts in trophic status from 1984-2019. Our results also
show that increases in eutrophication were rare (3\% of lakes) during
this period, and that lakes exhibiting negative trends in trophic status
were more common (17\% of lakes). Lakes that were not trending occupied
a wide range of lake and landscape characteristics, whereas lakes that
were becoming less eutrophic tended to be in more heavily developed
catchments. Our results highlight that while there are well-established
narratives that climate change can lead to more eutrophication of lakes,
this is not broadly observed in our dataset, with more lakes becoming
more oligotrophic than lakes becoming eutrophic.%
\end{abstract}%



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