Table 1. Sampling sites within each station: Station 1 (ST1), Station 2 (ST2), and Station 3 (ST3).

Total number of samples (N)=103, of which N = 25 at ST1, N = 22 at ST2, and N = 56 at ST3. CTD casts, corresponding depths and water column layers are shown for each site, as well as which sample type is taken (+). Abbreviations: PHYTO (samples (N = 38) taken for light microscopy and pigment analyses); SEM (samples ( N = 38) taken for scanning electron microscopy); NET (samples ( N = 27) taken with phytoplankton net with 20 µm mash size).

Station	Sampling site (latitude; longitude)	CTD Cast	Depth	Water column layer	PHYTO	SEM	NET
Station 1	22°14.6892; −151°52.2906	CTD4	0	S	+	+
		CTD4	115	DCM	+	+
		CTD4	130	MLD	+	+
	22°16.5251; −151°44.8940	CTD8	0	S	+	+
		CTD8	115	DCM	+	+
		CTD8	125	MLD	+	+	+
	22°16.5251; −151°44.8940	CTD14	0	S	+	+	+
		CTD14	88	DCM	+	+	+
		CTD14	128	MLD	+	+	+
		CTD14	180	BMLD	+	+	+
Station 2	27°42.5971; −139°29.9381	CTD18	0	S	+	+	+
		CTD18	98	DCM	+	+	+
		CTD18	128	MLD	+	+	+
	27°39.6715; −139°33.0614	CTD19	130	MLD		+
		CTD19	composite				+
	27°42.0327; −139°41.7295	CTD21	0	S	+	+
	27°44.7694; −139°40.2311	CTD22	0	S	+	+	+
		CTD22	95	DCM	+	+	+
		CTD22	120	MLD	+	+	+
Station 3	34°34.1060; −123°30.6151	CTD29	0	S	+	+
		CTD29	31	DCM	+	+
		CTD29	42	MLD	+	+
		CTD29	composite				+
		CTD33	0	S	+	+
	34°31.5869; −123°33.9840	CTD33	27	DCM	+	+
		CTD33	30	MLD	+	+
		CTD33	composite				+
		CTD37	0	S	+	+
	34°18.2352; −123°32.4584	CTD37	2	DCM	+	+
		CTD37	38	MLD	+	+
		CTD37	composite				+
	34°30.011; −123°11.1985	CTD38	0	S	+	+	+
	34°54.3259; −122°41.4444	CTD39	0	S	+	+	+
	35°40.1678; −121°55.7237	CTD40	0	S	+	+	+
	35°58.2849; −122°13.5212	CTD41	0	S	+	+	+
		CTD41	14	DCM	+
		CTD41	27	MLD	+	+
		CTD41	composite				+
	41°28.4439; −126°18.8841	CTD42	0	S	+	+	+
	41°30.6406; −125°20.7072	CTD43	0	S	+	+	+
		CTD43	80	DCM	+	+	+
		CTD43	90	MLD	+	+	+
		CTD43	composite				+
	41°32.8395; −124°24.2721	CTD44	0	S	+	+	+
	41°32.8395; −124°24.2722	CTD46	0	S	+	+	+