Long-Term Variations in Chlorophyll a and Primary Productivity in Jiaozhou Bay, China

Table 1

Data sources used for nutrient and chlorophyll a concentrations, primary productivity, and zooplankton biomass in Jiaozhou Bay.

Variables	Time	Sampling frequency	No. of stations	References
Nutrients (DIN, DIP, DSi*)	Feb. to Nov., 1981	Monthly	10	[8]
	1983–1986	Monthly (41 cruises in total)	11	[9]
	1991–1998	Seasonally (25 cruises in total)	9	[6]
	1997–1998	Seasonally (5 cruises)	6~19	[10]
	1999	Seasonally (3 cruises)	9	[11, 12]
	2001-2002	Seasonally (4 cruises)	14	[13]
	2001-2002	Seasonally (4 cruises)	9	[14]
	2003	Monthly	9	[15]
	Mar., 2006 to Feb., 2007	Monthly	12	Unpublished data
Chlorophyll a	1984	Seasonally (4 cruises)	9	[16]
	1991 to 2002	Seasonally (4 cruises a year)	10	[17]
	1997-1998	Seasonally (5 cruises)	6~19	[10]
	2001-2002	Seasonally (4 cruises)	9	[14]
	2003	Monthly	9	[15]
	May 2003 to Apr., 2004	Monthly	9	[18]
	Mar., 2006 to Feb., 2007	Monthly	12	Unpublished data
Primary productivity	1984	Monthly	9	[19]
	1991–1993	Seasonally (8 cruises in total)	9	[20]
	1991–1993	Seasonally (7 cruises in total)	9	[21]
	1995	Seasonally (5 cruises)	12	[22]
	1997	Seasonally (4 cruises)	9	[23]
	1999	Seasonally (4 cruises)	9	[23]
	2003	Monthly	9~12	[18, 24]
	Mar., 2006 to Feb., 2007	Monthly	9	Unpublished data
Zooplankton biomass	1983	Monthly	9	[23]
	1984	Monthly	9	[23]
	1985	Monthly	9	[23]
	1991	Seasonally (3 cruises )	9	[25]
	1992	Seasonally (4 cruises)	9	[25]
	1993	Seasonally (4 cruises)	9	[25]
	2003	Monthly	9	[18]

*Started in 1985.