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Article

Spatiotemporal Variability in Phytoplankton Bloom Phenology in Eastern Canadian Lakes Related to Physiographic, Morphologic, and Climatic Drivers

1
Institut national de la recherche scientifique, Centre Eau Terre Environnement, 490 Rue de la Couronne, Quebec City, QC G1K 9A9, Canada
2
Interuniversity Research Group in Limnology, University of Montreal, C.P. 6128, Succ. Centre-Ville, Montreal, QC H3C 3J7, Canada
*
Author to whom correspondence should be addressed.
Received: 31 July 2020 / Revised: 17 September 2020 / Accepted: 21 September 2020 / Published: 27 September 2020
Phytoplankton bloom monitoring in freshwaters is a challenging task, particularly when biomass is dominated by buoyant cyanobacterial communities that present complex spatiotemporal patterns. Increases in bloom frequency or intensity and their earlier onset in spring were shown to be linked to multiple anthropogenic disturbances, including climate change. The aim of the present study was to describe the phenology of phytoplankton blooms and its potential link with morphological, physiographic, anthropogenic, and climatic characteristics of the lakes and their watershed. The spatiotemporal dynamics of near-surface blooms were studied on 580 lakes in southern Quebec (Eastern Canada) over a 17-year period by analyzing chlorophyll-a concentrations gathered from MODIS (Moderate Resolution Imaging Spectroradiometer) satellite images. Results show a significant increase by 23% in bloom frequency across all studied lakes between 2000 and 2016. The first blooms of the year appeared increasingly early over this period but only by 3 days (median date changing from 6 June to 3 June). Results also indicate that high biomass values are often reached, but the problem is seldom extended to the entire lake surface. The canonical correlation analysis between phenological variables and environmental variables shows that higher frequency and intensity of phytoplankton blooms and earlier onset date occurred for smaller watersheds and higher degree-days, lake surface area, and proportion of urban zones. This study provides a regional picture of lake trophic state over a wide variety of lacustrine environments in Quebec, a detailed phenology allowing to go beyond local biomass assessments, and the first steps on the development of an approach exploiting regional trends for local pattern assessments. View Full-Text
Keywords: algal bloom phenology; chlorophyll-a; lake; watershed; climate; physiography; morphology; MODIS; Canada algal bloom phenology; chlorophyll-a; lake; watershed; climate; physiography; morphology; MODIS; Canada
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MDPI and ACS Style

Ratté-Fortin, C.; Chokmani, K.; Laurion, I. Spatiotemporal Variability in Phytoplankton Bloom Phenology in Eastern Canadian Lakes Related to Physiographic, Morphologic, and Climatic Drivers. Environments 2020, 7, 77. https://0-doi-org.brum.beds.ac.uk/10.3390/environments7100077

AMA Style

Ratté-Fortin C, Chokmani K, Laurion I. Spatiotemporal Variability in Phytoplankton Bloom Phenology in Eastern Canadian Lakes Related to Physiographic, Morphologic, and Climatic Drivers. Environments. 2020; 7(10):77. https://0-doi-org.brum.beds.ac.uk/10.3390/environments7100077

Chicago/Turabian Style

Ratté-Fortin, Claudie, Karem Chokmani, and Isabelle Laurion. 2020. "Spatiotemporal Variability in Phytoplankton Bloom Phenology in Eastern Canadian Lakes Related to Physiographic, Morphologic, and Climatic Drivers" Environments 7, no. 10: 77. https://0-doi-org.brum.beds.ac.uk/10.3390/environments7100077

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