Biodiversity of green algae covering artificial hard substrate surfaces in a suburban environment: a case study using molecular approaches

2016 ◽  
Vol 52 (5) ◽  
pp. 732-744 ◽  
Author(s):  
Christine Hallmann ◽  
Michael Hoppert ◽  
Opayi Mudimu ◽  
Thomas Friedl
Keyword(s):  
Green Algae ◽  
Hard Substrate ◽  
Molecular Approaches ◽  
Substrate Surfaces ◽  
Suburban Environment

scholarly journals Hindcast and Near Real-Time Monitoring of Green Macroalgae Blooms in Shallow Coral Reef Lagoons Using Sentinel-2: A New-Caledonia Case Study

2021 ◽  
Vol 13 (2) ◽  
pp. 211
Author(s):  
Maële Brisset ◽  
Simon Van Wynsberge ◽  
Serge Andréfouët ◽  
Claude Payri ◽  
Benoît Soulard ◽  
...  
Keyword(s):  
Green Algae ◽  
Algal Blooms ◽  
New Caledonia ◽  
Spectral Indices ◽  
Green Macroalgae ◽  
Spectral Bands ◽  
Algae Blooms ◽  
Trade Offs ◽  
Sentinel 2

Despite the necessary trade-offs between spatial and temporal resolution, remote sensing is an effective approach to monitor macroalgae blooms, understand their origins and anticipate their developments. Monitoring of small tropical lagoons is challenging because they require high resolutions. Since 2017, the Sentinel-2 satellites has provided new perspectives, and the feasibility of monitoring green algae blooms was investigated in this study. In the Poé-Gouaro-Déva lagoon, New Caledonia, recent Ulva blooms are the cause of significant nuisances when beaching. Spectral indices using the blue and green spectral bands were confronted with field observations of algal abundances using images concurrent with fieldwork. Depending on seabed compositions and types of correction applied to reflectance data, the spectral indices explained between 1 and 64.9% of variance. The models providing the best statistical fit were used to revisit the algal dynamics using Sentinel-2 data from January 2017 to December 2019, through two image segmentation approaches: unsupervised and supervised. The latter accurately reproduced the two algal blooms that occurred in the area in 2018. This paper demonstrates that Sentinel-2 data can be an effective source to hindcast and monitor the dynamics of green algae in shallow lagoons.

scholarly journals Evolution of Individuality: A Case Study in the Volvocine Green Algae

2017 ◽  
Vol 9 (20171201) ◽  
Author(s):  
Erik R. Hanschen ◽  
Dinah R. Davison ◽  
Zachariah I. Grochau-Wright ◽  
Richard E. Michod
Keyword(s):  
Green Algae
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