HIGHLIGHTS
SUMMARY
Consequently, diazotrophs are highly dependent on P availability (Wu et_al, 2000; Sañudo-Wilhelmy et_al, 2001; Mills et_al, 2004; Webb et_al, 2007). Measurable N2 fixation in P-limited regions suggests that the more abundant reduced P compounds (operationally defined as dissolved organic phosphorus, DOP) may be used by diazotrophs as an alternative source of P (Dyhrman et_al, 2007; Palter et_al, 2011). Several phytoplankton groups can obtain P from polyP (Björkman and Karl, 1994; Moore et_al, 2005; Diaz et_al, 2016), and some marine diatoms may even prefer polyP over the more abundant P-esters . . .
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