TY - JOUR
T1 - The Canary in the Coal Mine
T2 - Testate Amoebae Record Anthropogenic Impacts in Sediments of Oligotrophy Lake George, NY, USA
AU - Kornecki, Krystyna M.
AU - Schuler, Matthew S.
AU - Katz, Miraim E.
AU - Relyea, Rick A.
AU - McCarthy, Francine M.G.
AU - Schaller, Morgan F.
AU - Gillikin, David P.
AU - Stager, J. Curt
AU - Boylen, Chuck W.
AU - Eichler, Lawrence W.
AU - Nierzwicki-Bauer, Sandra A.
N1 - Publisher Copyright:
© 2020 Cushman Foundation. All rights reserved.
PY - 2020/4
Y1 - 2020/4
N2 - Lake George (NY) is surrounded by Forever Wild Forest in the Adirondack Park and has a Class AA Special water quality rating, yet lake monitoring has revealed increasing anthropogenic impacts from salt and nutrient loading over the past 30 years. To reconstruct anthropogenic influence on the lake (e.g., salt loading, eutrophication, climate warming), we character-ized modern stable isotopes and testate amoeba and diatom assemblages in surface sediments from 33 lake-wide sites and compared their variability to 36 years of water-quality data. Linear regression analyses support testate amoebae as rapid responders and recorders of environmental change because taxa are strongly correlated with percent change of impor-tant water quality parameters. Our assessment indicates that: 1) Aletzelia gramert is associated with aquatic plants and fil- A mentous algae, making them a valuable aquatic plant/alga indicator, which is supported by the co-occurrence of the di- A tom Cocconeis spp.; 2) difflugids are generally good indicators of eutrophication, except for Difflugia protaeiformis; and 3) seasonal differences in water quality trends are reflected in the fossil record on decadal time scales. We show that testate amoebae are highly sensitive to small environmental changes in an oligotrophic lake and exhibit established relationships from eutrophic and mesotrophic lakes as well as new, likely oligotrophic-specific correlations. Correlation coefficients of water quality variables and strains within a species also illustrate gradational relationships, suggesting testate amoebae exhibit ecophenotypic plasticity. Diatom and testate amoeba assemblages categorize modern lakebed sites into four sub-groups: I) enthic macrophyte; 2) high nutrient; 3) high alkalinity; and 4) salt loading assemblages.
AB - Lake George (NY) is surrounded by Forever Wild Forest in the Adirondack Park and has a Class AA Special water quality rating, yet lake monitoring has revealed increasing anthropogenic impacts from salt and nutrient loading over the past 30 years. To reconstruct anthropogenic influence on the lake (e.g., salt loading, eutrophication, climate warming), we character-ized modern stable isotopes and testate amoeba and diatom assemblages in surface sediments from 33 lake-wide sites and compared their variability to 36 years of water-quality data. Linear regression analyses support testate amoebae as rapid responders and recorders of environmental change because taxa are strongly correlated with percent change of impor-tant water quality parameters. Our assessment indicates that: 1) Aletzelia gramert is associated with aquatic plants and fil- A mentous algae, making them a valuable aquatic plant/alga indicator, which is supported by the co-occurrence of the di- A tom Cocconeis spp.; 2) difflugids are generally good indicators of eutrophication, except for Difflugia protaeiformis; and 3) seasonal differences in water quality trends are reflected in the fossil record on decadal time scales. We show that testate amoebae are highly sensitive to small environmental changes in an oligotrophic lake and exhibit established relationships from eutrophic and mesotrophic lakes as well as new, likely oligotrophic-specific correlations. Correlation coefficients of water quality variables and strains within a species also illustrate gradational relationships, suggesting testate amoebae exhibit ecophenotypic plasticity. Diatom and testate amoeba assemblages categorize modern lakebed sites into four sub-groups: I) enthic macrophyte; 2) high nutrient; 3) high alkalinity; and 4) salt loading assemblages.
UR - http://www.scopus.com/inward/record.url?scp=85096305746&partnerID=8YFLogxK
U2 - 10.2113/gsjfr.50.2.128
DO - 10.2113/gsjfr.50.2.128
M3 - Review article
AN - SCOPUS:85096305746
SN - 0096-1191
VL - 50
SP - 128
EP - 140
JO - Journal of Foraminiferal Research
JF - Journal of Foraminiferal Research
IS - 2
ER -