Effects of nitrogen and phosphorus enrichement on in vivo symbiotic zooxanthellae of Pocillopora damicornis |
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| Authors: | A Snidvongs R A Kinzie III |
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| Institution: | (1) Oceanography Department, University of Hawaii, 100 Pope Road, 96882 Honolulu, Hawaii, USA;(2) Hawaii Institute of Marine Biology, University of Hawaii, P.O. Box 1346, 96744 Kaneohe, Hawaii, USA;(3) Zoology Department, University of Hawaii, 2538 The Mall, 96822 Honolulu, Hawaii, USA;(4) Hawaii Institute of Marine Biology, P.O. Box 1346, 96744 Kaneohe, Hawaii, USA;(5) Present address: Department of Marine Science, Chulalongkorn University, 10330 Bangkok, Thailand |
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| Abstract: | The reef coral Pocillopora damicornis (Linnaeus) was grown for 8 wk in four nutrient treatments: control, consisting of ambient, unfiltered Kaneohe Bay seawater dissolved inorganic nitrogen (DIN,  1.0  M) and dissolved inorganic phosphate (DIP, 0.3 M)]; nitrogen enrichment (15 M DIN as ammonium); phosphorus enrichment (1.2 M DIP as inorganic phosphate); and 15 M DIN+1.2 M DIP. Analyses of zooxanthellae for C, N, P and chlorophyll a after the 8 wk experiment indicated that DIN enrichment increased the cellular chlorophyll a and excess nitrogen fraction of the algae, but did not affect C cell-1. DIP enrichment decreased both C and P cell-1, but the decrease was proportionally less for C cell-1. the response of cellular P to both DIN and DIP enrichment appeared to be in the same direction and could not be explained as a primary effect of external nutrient enrichment. The observed response of cellular P might be a consequence of in situ CO2 limitation. DIN enrichment could increase the CO2 (aq) demand by increasing the net production per unit area. DIP enrichment could slow down calcification, thus decreasing the availability of CO2 (aq) in the coral tissue.Hawaii Institute of Marine Biology Contribution No. 920 |
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