Wind induced turbulence caused colony disaggregation and morphological changes in the cyanobacterium Microcystis

Loading...
Thumbnail Image
File version

Version of Record (VoR)

Author(s)
Zhu, W
Chen, H
Xiao, M
Miquel, L
Li, M
Griffith University Author(s)
Primary Supervisor
Other Supervisors
Editor(s)
Date
2021
Size
File type(s)
Location
License
Abstract

Colony size and morphology influence the vertical migration capacity of Microcystis and therewith the occurrence of surface accumulations or blooms. To explore the influence of wind-induced turbulence on the colony size and morphology of Microcystis in field conditions, a high-frequency field investigation was conducted in an enclosure in Meiliang Bay, Lake Taihu, China, from 26 August to 7 September 2012. A Pearson's correlation analysis indicated that the in situ growth rate of Microcystis was negatively related to surface cell density and positively related to wind speed. Strong wind speed stimulated Microcystis growth by enhancing light transmission due to the homodispersion of Microcystis in the water column. The Microcystis colony size was negatively correlated with wind speed, suggesting that wind-induced turbulence could break up colonies in shallow lakes. The results indicated that Microcystis colonies could be broken up by a turbulence intensity of 2.33×10-5 m2/s3, which corresponds to an average wind speed of 5.00 m/s in a reservoir with 30-m depth. Different Microcystis morphotypes were present and negative relationships were detected between the proportion of Microcystis ichthyoblabe and the proportion of Microcystis wesenbergii and between the proportion of Microcystis aeruginosa and the proportion of Microcystis wesenbergii out of all Microcystis throughout the water column, but more evidence is need to support the hypothesis that the morphology of Microcystis colonies changes over time. Altogether, the results suggest that declining wind speed, driven by climate change, will promote surface blooms of Microcystis due to the formation of larger colonies.

Journal Title

Journal of Lake Sciences (Hupo Kexue)

Conference Title
Book Title
Edition
Volume

33

Issue

2

Thesis Type
Degree Program
School
Publisher link
Patent number
Funder(s)
Grant identifier(s)
Rights Statement
Rights Statement

© 2021 Journal of Lake Sciences. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.

Item Access Status
Note
Access the data
Related item(s)
Subject

Earth sciences

Physical oceanography

Environmental sciences

Persistent link to this record
Citation

Zhu, W; Chen, H; Xiao, M; Miquel, L; Li, M, Wind induced turbulence caused colony disaggregation and morphological changes in the cyanobacterium Microcystis, Journal of Lake Sciences (Hupo Kexue), 2021, 33 (2), pp. 349-365

Collections