A warm-core eddy linking shelf, Leeuwin Current and oceanic waters demonstrated by near-shelf distribution patterns of Synechococcus spp. and Prochlorococcus spp. in the eastern Indian Ocean
Harriet Paterson A C D , Kathy Heel B and Anya Waite A
+ Author Affiliations
- Author Affiliations
A School of Environmental Systems Engineering and The Oceans Institute, The University of Western Australia, Crawley, WA 6009, Australia.
B School of Pathology and Laboratory Medicine, The University of Western Australia, Crawley, WA 6009, Australia.
C Centre of Excellence in Natural Resource Management, The University of Western Australia, Albany, WA 6330, Australia.
D Corresponding author. Email: Harriet.Paterson@uwa.edu.au
Marine and Freshwater Research 64(11) 1011-1021 https://doi.org/10.1071/MF12271
Submitted: 23 September 2012 Accepted: 25 April 2013 Published: 19 July 2013
Abstract
In May 2006 (Austral autumn) the distribution and abundance of the cyanobacteria Synechococcus spp. and Prochlorococcus spp. were examined to assess the connectivity of a forming warm-core mesoscale eddy with the Leeuwin Current and shelf waters off south-west Western Australia. Distributions of the cyanobacteria resulted in two broad categories of samples, those dominated by Prochlorococcus spp. from subtropical and Leeuwin Current waters and those with mixed populations from shelf and eddy waters. Water temperature (21.45°C), salinity (35.46) and nitrate (0.33 μM) contributed to these groupings. Synechococcus spp. reached an integrated abundance of 3.3 × 108 cells cm–2 in warm shelf waters, with 60% of cells in G2 phase in the mid-afternoon (~16:00 hours). Cooler, nitrate-poor oceanic waters were almost exclusively inhabited by Prochlorococcus spp., with the highest abundance of 4.2 × 108 cells cm–2 in cool deep waters off the Capes in the south with 40% of cells in G2 phase in the evening (~19:00 hours). The eddy perimeter represented a clear boundary for both species, but showed connectivity between the shelf and eddy centre as both locations had a mixed community, dominated by Synechococcus spp. Eddies of the Leeuwin Current advect shelf waters, and their assemblages and productivity offshore.
Additional keywords: cyanobacteria, division rate, Eastern Indian Ocean, Leeuwin Current, picoplankton, warm core eddy.
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