Journal
JOURNAL OF GREAT LAKES RESEARCH
Volume 40, Issue 2, Pages 317-324Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jglr.2014.02.018
Keywords
Remote sensing; SeaWiFS; Laurentian Great Lakes; Primary production; Quagga mussels; Dreissenid mussels; PAR; Chlorophyll a
Funding
- NASA Roses [NNX09AU88]
- NASA Carbon Monitoring [NNX12AP94G]
- NASA [NNX12AP94G, 14160] Funding Source: Federal RePORTER
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Thirteen years of SeaWiFS data (1998-2010) from the early spring isothermal period (March-April) were used to determine trends of water attenuation coefficient (K-dPAR), chlorophyll a (Chl a), Photosynthetic Available Radiation (PAR), and modeled primary production in southern Lake Michigan. Surface PAR values remained unchanged between 1998 and 2010, but there was an 18-22% drop in K-dPAR during the March/April isothermal period as water clarity increased. This transparency increase was accompanied by a 41-53% decline in Chl a concentration (pg . L-1) and a 42-46% decline in modeled primary production (Great Lakes Primary Production Model). These changes were most pronounced in 2001-2003 which coincided with the period of initial colonization of the quagga mussels. Statistically significant spatial differences were noted in Chl a (mu g . L-1) concentrations between mid-depth (z = 30-90 m deep), and offshore (z > 90 m deep) waters. Chi a concentrations in the mid-depth region (30-90 m) decreased at a higher rate compared to offshore waters (>90 m) likely as a result of filtration activities of quagga mussel. (C) 2014 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
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