Article History
Received: 22 July 2015
Accepted: 9 December 2015
First Online: 11 January 2016
Change Date: 16 August 2016
Change Type: Corrigendum
Change Details: In the version of this Letter originally published, it was incorrectly stated in Figure 1 that Chlorophyll-α concentrations were recorded on 12 January 2013, when the date should have been 1 December 2013. This has been corrected in the online versions of the paper.
Competing interests
: The authors declare no competing financial interests.