Abstract
Few studies have assessed the relative importance of landscape, land use history, climate, and regional heterogeneity on lake ecosystem processes, despite the likelihood that interactions among these factors must be important for controlling lake dynamics. We used 14 sediment measures from 20 lake cores in a climatically sensitive region of the prairie-forest border in southern Minnesota to (1) assess relationships between modern lake productivity (Carlson’s Trophic State Index [TSI]), modern land-use, catchment, and lake morphometry, and (2) contrast regional responses to climatic transitions from the ‘Medieval Climatic Anomaly’(1000–1350) to the ‘Little Ice Age’ (1350–1800) to ‘Modern’(~1980–1996 AD). TSI was significantly positively correlated with modern sedimentation rate, and accumulation rates of organic matter (OM), biogenic silica (BSi), and total phosphorus (TP). TSI was not significantly correlated with “modern” land cover, catchment, or lake morphometry characteristics, but total organic N(N) was negatively correlated with percent cultivation in the catchment area and negatively correlated with δ15N of bulk organic matter in sediment. Regional, among-lake heterogeneity was high over the past 1,000 years, but Little Ice Age (LIA) cooling appeared to result in an approximately 20% decline in OM, BSi and TP accumulation, while warming and cultural eutrophication of the past 150 years corresponded to a 200–400% increase in accumulation rates as well as an 80% increase in carbonates and a small but significant 10% drop in C/N ratios consistent with greater in-lake productivity. Our results indicate that climate does have regional effects on lake ecosystems but that among-lake variability is high, reflecting the importance of local factors and suggesting a need for (1) more explicit definition of what ‘regional’ means, (2) a focus on degree as well as direction of change, and (3) estimating accumulation rates based on multiple lakes and multiple cores within lakes.
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Acknowledgments
Thanks for lab and field assistance to Donald Mensing-Solick, and St. Olaf students Britt Carlson, Lori Enlund, Leah Dvorak, Eric Bergman, Matt Boehm, Eric Dehn, Joel Froehle, Wade Hammer, Kristina Houser, Tara Jeffers, Laura Johnson, John McBride, Molly McGrath, Karsi Mertens and and Rebekah Van Wieren. Dan Engstrom and Mark Edlund provided many helpful comments that greatly improved this manuscript. This work was funded in part by a summer faculty research grant from St Olaf College, by a grant to St Olaf from the Howard Hughes Medical Institution, NSF DBI-0520803, and an ROA supplement to NSF DEB-0092704.
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Umbanhowar, C.E., Camill, P. & Dorale, J.A. Regional heterogeneity and the effects of land use and climate on 20 lakes in the big woods region of Minnesota. J Paleolimnol 45, 151–166 (2011). https://doi.org/10.1007/s10933-010-9486-5
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DOI: https://doi.org/10.1007/s10933-010-9486-5