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Table 3.

Mean daily uptake of carbon and nitrogen by the sponge Haliclona cymiformis from the plankton community

	Winter					Summer
Type of ultraplankton	Day	Night	Total	Day	Night	Total
Carbon (mg C g^-1 dry mass day^-1)
Heterotrophic bacteria	2.75	3.88	6.63	ns	ns	ns
Synechococcus	0.01	0.06	0.07		0.09	0.09
Protozoans	0.06	0.08	0.14	0.12	0.07	0.19
Total			6.84			0.28
Nitrogen (mg N g^-1 dry mass day^-1)
Heterotrophic bacteria	0.79	1.11	1.90	ns	ns	ns
Synechococcus		0.01	0.01		0.01	0.01
Protozoans	0.08	0.10	0.18	0.16	0.10	0.26
Total			2.09			0.27

	Winter					Summer
Type of ultraplankton	Day	Night	Total	Day	Night	Total
Carbon (mg C g^-1 dry mass day^-1)
Heterotrophic bacteria	2.75	3.88	6.63	ns	ns	ns
Synechococcus	0.01	0.06	0.07		0.09	0.09
Protozoans	0.06	0.08	0.14	0.12	0.07	0.19
Total			6.84			0.28
Nitrogen (mg N g^-1 dry mass day^-1)
Heterotrophic bacteria	0.79	1.11	1.90	ns	ns	ns
Synechococcus		0.01	0.01		0.01	0.01
Protozoans	0.08	0.10	0.18	0.16	0.10	0.26
Total			2.09			0.27

The natural light:dark cycle is assumed to be 12 h: 12 h for winter and 14 h: 10 h for summer.

Fluxes that are less than 0.01 mg are indicated as not significant(ns).