Table 1. Environmental factors of the four sites. Almost all nutrients concentration increased from the gyre center to the edge, and many concentrations close to the detection limit [6].

Site	Date	Time	Location	Tem [°C ]	Salinity at 80 m(psu) [48]	Chl a [µg l−1][6]	Nitrate [µM] [6]	Ammonium [µM] [6]	Phosphate [µM] [6]
U1368	12 Nov	14∶30 pm	27°55′S, 123°10′W	22	35.26	∼0.02	∼0.5	∼0.02	∼0.05
U1369	22 Nov	14∶45 pm	39°19′S, 139°48′W	17.5	34.33	∼0.30	∼1.5	∼0.12	∼0.6
U1370	26 Nov	16∶00 pm	41°51′S, 153°06′W	15	34.45	∼0.35	∼1.2	∼0.12	∼0.8
U1371	2 Dec	9∶00 am	45°58′S, 163°11′W	12	34.70	∼0.40	∼3.8	∼0.18	∼0.9