“…Our 330 values (range of 129 to 335 μmol C mol photons −1 ) fall into the lower range of reported 330 values in lakes (Groeneveld et al, 2016;Koehler et al, 2014Koehler et al, , 2016Vähätalo & Wetzel, 2004;Vähätalo et al, 2000), rivers, and estuaries (Bélanger et al, 2006;Gao & Zepp, 1998;White et al, 2010), as well as coastal ocean (Aarnos et al, 2012;Johannessen & Miller, 2001;Johannessen et al, 2007;Powers & Miller, 2015;Reader & Miller, 2012). A possible explanation for our low values is the long irradiation time.…”