Using visible near-infrared reflectance spectroscopy (VNIRS) of lake sediments to estimate historical changes in cyanoba
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ORIGINAL PAPER
Using visible near-infrared reflectance spectroscopy (VNIRS) of lake sediments to estimate historical changes in cyanobacterial production: potential and challenges Elizabeth J. Favot . Kristopher R. Hadley . Andrew M. Paterson . Neal Michelutti . Susan B. Watson . Arthur Zastepa . Neil J. Hutchinson . Rolf D. Vinebrooke . John P. Smol
Received: 17 April 2019 / Accepted: 23 June 2020 Ó Springer Nature B.V. 2020
Abstract Cyanobacterial blooms areincreasingworldwide and have negative impacts on aquatic ecosystems and the services they provide to human societies. A lack of long-term environmental monitoring data, however, has prevented the development of a baseline perspective against which drivers of the increasing frequency and severity of cyanobacterial blooms can be identified. In this study, we evaluate application of spectroscopy-based models to infer historical trends in cyanobacterial abundance from Elizabeth J. Favot and Kristopher R. Hadley contributed equally to this work. E. J. Favot (&) N. Michelutti J. P. Smol Paleoecological Environmental Assessment and Research Lab (PEARL), Department of Biology, Queen’s University, Kingston, ON K7L 3N6, Canada e-mail: [email protected] N. Michelutti e-mail: [email protected] J. P. Smol e-mail: [email protected] K. R. Hadley Hutchinson Environmental Sciences Ltd., 501 Krug St., Kitchener, ON N2B 1L3, Canada e-mail: [email protected]
lake sediment cores. Using an amendment series (n = 15) of a sediment matrix spiked with increasing amounts of mixed cyanobacterial culture from 0 to 50 parts per thousand (%), taxonomically diagnostic carotenoids were measured using visible near-infrared reflectance spectroscopy (VNIRS) and conventional but more costly and time-consuming high-performance liquid chromatography (HPLC). A partial least squares regression model was developed to correlate amendment series VNIR spectra to % of added cyanobacteria. Despite challenges in differentiating carotenoid pigments because of overlapping absorption peaks, applications of the resulting 2-component Bellwood Acres Road, P.O. Box 39, Dorset, ON P0A 1E0, Canada e-mail: [email protected] S. B. Watson A. Zastepa Environment and Climate Change Canada, Canada Centre for Inland Waters, 867 Lakeshore Rd., Burlington, ON L7S 1A1, Canada e-mail: [email protected] A. Zastepa e-mail: [email protected] N. J. Hutchinson Hutchinson Environmental Sciences Ltd., 1-5 Chancery Lane, Bracebridge, ON P1L 2E3, Canada e-mail: [email protected]
A. M. Paterson Ontario Ministry of the Environment, Conservation and Parks, Dorset Environmental Science Centre, 1026
123
J Paleolimnol
model (r2 = 0.93, RMSEP = 0.23%) to sediment cores from four Ontario lakes yielded temporal trends that were significantly correlated with downcore HPLC measures of cyanobacterial pigments in three out of four cases. Although our method is simplistic and may be improved in the future with more complex
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