Table 2.

Existing data on the dissolved concentrations of potential auxophores in aquatic environments.

Compound	Dissolved (pM)	Reference
Biotin	10–200*	Sañudo-Wilhelmy et al. 2012
Isoleucine	790–8000§	Mopper and Lindroth 1982
Phenylalanine	400–4000§	Mopper and Lindroth 1982
Pyridoxine	50–450*	Sañudo-Wilhelmy et al. 2012
Riboflavin	0.2–5*	Sañudo-Wilhelmy et al. 2012
Thiamin	25–350*	Sañudo-Wilhelmy et al. 2012
Tryptophan	n.d.-1000§	Mopper and Lindroth 1982
Alanine	2000–70 000§	Mopper and Lindroth 1982; Lu et al. 2014
Methionine	n.d.-500§	Mopper and Lindroth 1982
Glycine	2000–100 000§	Mopper and Lindroth 1982; Lu et al. 2014
Glutamic acid	1000–20 000§	Mopper and Lindroth 1982; Lu et al. 2014
Glutamine	700–70 000§	Mopper and Lindroth 1982; Lu et al. 2014
Aspartic acid	2000–25 000§	Mopper and Lindroth 1982; Lu et al. 2014
Threonine	2000–14 000§	Mopper and Lindroth 1982
Asparagine	300–10 000§	Mopper and Lindroth 1982; Lu et al. 2014
Arginine	500–3000§	Mopper and Lindroth 1982
Serine	7000–47 000§	Mopper and Lindroth 1982
Valine	700–6000§	Mopper and Lindroth 1982
Histidine	1000–10 000§	Mopper and Lindroth 1982; Lu et al. 2014
Leucine	400–5000§	Mopper and Lindroth 1982
Lysine	1000–22 000§	Mopper and Lindroth 1982; Lu et al. 2014
Tyrosine	300–6000§	Mopper and Lindroth 1982
Vitamin B12	.1–8¶	Koch et al. 2011
Inositol	Data not available
Adenine	Data not available
Spermidine	1000–40 000∞	Nishibori et al. 2001; Lu et al. 2014
Uracil	Data not available
Niacin	Data not available

^*Coastal California (1–800 m)

^§Baltic Sea (1–170 m); Coastal Georgia (2–17 m), note that these are dissolved free amino acids, amino acid availability is greater through protein degradation

^•North Pacific Ocean (5–150 m)

^¶Gulf of Alaska (50–5500 m)

^∞Seto Inland Sea of Japan (surface, during phytoplankton blooms); Coastal Georgia (2–17 m)