Abstract
Batch cultures of Microcystis aeruginosa (M. aeruginosa) were cultivated at seven different temperatures to measure the specific growth rate at each temperature. A relationship between temperature and specific growth rate was established. We propose a cardinal temperature model for M. aeruginosa with the inflection point (optimal temperature) located at 27.5°C. The model describes 98% of the variability of experimental data from 5°C to 35°C. A digital inline holographic microscope was employed to visualize and analyze the buoyancy of the M. aeruginosa colonies at two different temperatures. The results demonstrated a five times difference in buoyant velocities of colonies at 17.5°C and 28°C. A model was derived to calculate the density of a colony using the buoyant velocity and colony size. The findings provide a better understanding of temperature effects on the growth and buoyancy of M. aeruginosa. The results could facilitate the prediction and mitigation of harmful algal blooms in aquatic ecosystems.
Original language | English (US) |
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Pages (from-to) | 16-28 |
Number of pages | 13 |
Journal | Journal of Plankton Research |
Volume | 40 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 2018 |
Bibliographical note
Funding Information:“Environment and Natural Resources Trust Fund 2015-2016 (ID: 038-B): Assessing the Increasing Harmful Algal Blooms in Minnesota Lakes”, from the funding
Keywords
- Microcystis
- buoyancy
- growth rate
- holography
- temperature