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Nutrient limitation of the macroalga,Penicillus capitatus, associated with subtropical seagrass meadows in Bermuda

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Abstract

Nutrient limitation of the rhizophytic macroalgaPenicillus capitatus found associated with subtropical seagrass meadows in Bermuda was determined from enrichment assays and subsequent tissue analyses. The photosynthetic response ofP. capitatus to additions of inorganic nitrogen (N) or phosphorus (P), measured as oxygen evolution in closed incubation chambers, increased significantly in both the 16 h and 6 d experiments only with nitrogen enrichment. The average photosynthetic response for all treatments was virtually identical in the two experiments, indicating that there was not a significant time lag in nutrient uptake and that the short term (16 h) assay accurately reflected the longer term (6 d) photosynthetic response to nutrient enrichment. Average tissue nitrogen levels for the nitrogen-treated algae were 29% higher than the phosphorus-treated algae and 18% greater than the controls, corroborating the results from the photosynthesis assay.P. capitatus may acquire nutrients directly from sediment sources via rhizoid holdfasts. Ratios of total dissolved nitrogen (TN) to total dissolved phosphorus (TP) in pore water at 10 and 20 cm depths (6.1 and 4.5, respectively) indicate a nitrogen-limited nutrient pool. These low pore water TN:TP ratios may be a function of a limited sorptive capacity of the calcium carbonate sediments for phosphate, anthropogenic nutrient inputs, or high rates of denitrification, all of which would induce N rather than P limitation in these carbonate-rich sediments.

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Authors and Affiliations

  1. Section of Ecology and Systematics Division of Biological Sciences Corson Hall, Cornell University, 14853-2701, Ithaca, New York

    Karen J. McGlathery, Robert W. Howarth & Roxanne Marino

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  1. Karen J. McGlathery
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  2. Robert W. Howarth
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  3. Roxanne Marino
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McGlathery, K.J., Howarth, R.W. & Marino, R. Nutrient limitation of the macroalga,Penicillus capitatus, associated with subtropical seagrass meadows in Bermuda. Estuaries 15, 18–25 (1992). https://doi.org/10.2307/1352706

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