TY - JOUR
T1 - Physical-Biological Coupling in Southern Lake Michigan
T2 - Influence of Episodic Sediment Resuspension on Phytoplankton
AU - Millie, David F.
AU - Fahnenstiel, Gary L.
AU - Lohrenz, Steven E.
AU - Carrick, Hunter J.
AU - Johengen, Thomas H.
AU - Schofield, Oscar M.E.
N1 - Funding Information:
This work is a portion of the research program, Episodic Events – Great Lakes Experiment (EEGLE): “The Impact of Episodic Events on the Nearshore-Offshore Transport and Transformation of Bio-geochemically Important Materials in the Great Lakes”, funded by the National Oceanic and Atmospheric Administration, Coastal Ocean Program and the National Science Foundation, Coastal Ocean Processes. We thank the crew of the RV Laurentian for their professional assistance and Larry Boihem, Augie Kotlewski, and Richard Stone for assisting in preparation, sampling, and sample analyses. Satellite imagery was provided by the National Oceanic and Atmospheric Administration, Great Lakes Coast Watch Program. Reference to proprietary names are necessary to report factually on available data; however, the Florida Institute of Oceanography, the National Oceanic and Atmospheric Administration, the Pennsylvania State University, the University of Michigan, and the University of Southern Mississippi neither guarantee nor warrant the standard of a product and imply no approval of a product to the exclusion of others that may be suitable.
PY - 2003/10
Y1 - 2003/10
N2 - The influence of episodic, sediment resuspension on phytoplankton abundance/volume and composition, the photosynthetic maximum rate (P maxB) and efficiency (αB), and chlorophyll-specific growth (μChl) was evaluated during the spring isothermal period in southern Lake Michigan (Laurentian Great Lakes, USA). Resuspension altered the nutrient and light climate of nearshore waters; light attenuation (Kd) and phosphorus concentrations corresponded (p ≤ 0.0001 and p ≤ 0.001, respectively) with concentrations of suspended particulate matter (SPM). Phytoplankton cell volume and diatom cell abundance and volume were not associated with SPM concentrations (p > 0.05). Diatom composition displayed spatial dissimilarities corresponding with resuspension (p ≤ 0.001); small centric diatoms exhibiting meroplanktonic life histories and pennate diatoms considered benthic in origin were most abundant within SPM-impacted, nearshore waters whereas taxa typically comprising assemblages in optically-clear, offshore waters and the basin-wide, spring bloom were not. Values of PmaxB and αB corresponded (p ≤ 0.0001) with both Kd coefficients and SPM concentrations, potentially reflecting increased light harvesting/utilization within impacted assemblages. However, integral production was inversely associated with K d coefficients and SPM concentrations (p < 0.0001) and photosynthesis was light-limited (or nearly so) for most assemblages. Although μChl values corresponded with Kd coefficients (p ≤ 0.05), values were quite low (x̄ ± S.E., 0.10 ± 0.004 d -1) throughout the study. Most likely, distinct rate processes between SPM- and non-impacted assemblages reflected short-term compositional (and corresponding physiological) variations due to infusion of meroplankton and/or tributary-derived phytoplankton. Overall, resuspension appears to have little, if any, long-term impact upon the structure and function of the lake's phytoplankton.
AB - The influence of episodic, sediment resuspension on phytoplankton abundance/volume and composition, the photosynthetic maximum rate (P maxB) and efficiency (αB), and chlorophyll-specific growth (μChl) was evaluated during the spring isothermal period in southern Lake Michigan (Laurentian Great Lakes, USA). Resuspension altered the nutrient and light climate of nearshore waters; light attenuation (Kd) and phosphorus concentrations corresponded (p ≤ 0.0001 and p ≤ 0.001, respectively) with concentrations of suspended particulate matter (SPM). Phytoplankton cell volume and diatom cell abundance and volume were not associated with SPM concentrations (p > 0.05). Diatom composition displayed spatial dissimilarities corresponding with resuspension (p ≤ 0.001); small centric diatoms exhibiting meroplanktonic life histories and pennate diatoms considered benthic in origin were most abundant within SPM-impacted, nearshore waters whereas taxa typically comprising assemblages in optically-clear, offshore waters and the basin-wide, spring bloom were not. Values of PmaxB and αB corresponded (p ≤ 0.0001) with both Kd coefficients and SPM concentrations, potentially reflecting increased light harvesting/utilization within impacted assemblages. However, integral production was inversely associated with K d coefficients and SPM concentrations (p < 0.0001) and photosynthesis was light-limited (or nearly so) for most assemblages. Although μChl values corresponded with Kd coefficients (p ≤ 0.05), values were quite low (x̄ ± S.E., 0.10 ± 0.004 d -1) throughout the study. Most likely, distinct rate processes between SPM- and non-impacted assemblages reflected short-term compositional (and corresponding physiological) variations due to infusion of meroplankton and/or tributary-derived phytoplankton. Overall, resuspension appears to have little, if any, long-term impact upon the structure and function of the lake's phytoplankton.
KW - Coastal resuspension
KW - Diatoms
KW - Great Lakes
KW - Growth
KW - Microalgae
KW - Photosynthesis
UR - http://www.scopus.com/inward/record.url?scp=1642484931&partnerID=8YFLogxK
U2 - 10.1023/B:AECO.0000007046.48955.70
DO - 10.1023/B:AECO.0000007046.48955.70
M3 - Article
AN - SCOPUS:1642484931
SN - 1386-2588
VL - 37
SP - 393
EP - 408
JO - Aquatic Ecology
JF - Aquatic Ecology
IS - 4
ER -
