“…As an example, the temperature sensitivity of bacterial processes can be strongly affected by substrate availability (Arandia-Gorostidi et al, 2017;Degerman et al, 2013;López-Urrutia & Morán, 2007;Maske et al, 2017). The studies focusing on bacterial DOC cycling in tropical coastal waters have shown a high variability in BGE (spanning from 2% to 64%; (Antai et al, 2013;Carreira et al, 2021;Guenther et al, 2008Guenther et al, , 2017Lee et al, 2009;Lønborg et al, 2019;Ram et al, 2003Ram et al, , 2007Silva et al, 2019). In our control treatments the average BGE value (2%-GBR and 5%-Red Sea) are within this wide range but they were at the lower end of global averages reported for coastal waters (27%, (Giorgio & Cole, 1998) and 19%, (Robinson, 2008)), yet comparable to previous estimates in the GBR (2%, (Carreira et al, 2021)) and Red Sea (7%, (Silva et al, 2019)) as well as values reported for for example, the subtropical southern East China Sea (6%, (Chen et al, 2020)).…”