NDLI: Adirondack (NY, USA) reference lakes show a pronounced shift in chrysophyte species composition since ca. 1900

Content Provider	Springer Nature Link
Author	Arseneau, Kristina M. A. Driscoll, Charles T. Cummings, Cassandra M. Pope, Graham Cumming, Brian F.
Copyright Year	2016
Abstract	Researchers are increasingly tasked with identifying biological recovery targets as ecosystems recover from anthropogenic stressors. Attempts to define such recovery targets are often hampered by two problems: (1) a lack of long-term monitoring data; and (2) the confounding influence of multiple stressors, especially regional stressors like climate warming. Paleolimnological studies of minimally disturbed reference sites can help address both these issues. Using paleoecological techniques, researchers can isolate the long-term impact of regional stressors like climate change on species assemblages largely independent of other confounding stressors such as acidification, eutrophication, and land-use change, thereby providing a framework to assess biological recovery in lakes that are recovering from acid deposition or other stressors. This manuscript provides a theoretical paleolimnological framework for the use of reference lakes in studying biological recovery from acidification, and provides an example of how assemblages of scaled-chrysophytes have changed in Adirondack-region reference lakes (NY, USA) from pre-ca. 1900 to present. The thirty-one reference lakes were selected from a database of over 1400 lakes, using criteria to minimize the influence of acidification, eutrophication, road-salt seepage, and piscivore introductions. As such, these lakes provide a unique opportunity to examine the effects of regional stressors in the Adirondack ecological region, which can inform biological recovery in lakes that have acidified historically. The modern chrysophyte assemblages from the reference lakes were significantly related to modern limnological variables including pH, dissolved organic carbon and ionic concentration as well as important physical variables including lake depth, which were used to help understand changes in the chrysophyte assemblages over the last century. Changes in chrysophyte assemblages from pre-1900 to present were determined by comparing the modern surface assemblages to a sediment interval representing pre-1900 conditions, revealing significant increases in the abundance of colonial chrysophyte taxa, especially S. petersenii, S. sphagnicola, and S. echinulata, and corresponding decreases in the relative abundance of many Mallomonas taxa. These changes suggest that regional warming and/or oligotrophication have influenced the species assemblages of minimally disturbed reference lakes, suggesting that lakes currently recovering from acidification are unlikely to return to their pre-disturbance assemblages.
Starting Page	349
Ending Page	364
Page Count	16
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	56
Issue Number	4
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-10-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Reference sites Climate change Shifting baseline Recovery Adirondacks Chrysophytes Paleontology Sedimentology Climate Change Physical Geography Freshwater & Marine Ecology Geology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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