Abstract
Large quantities of nutrients, including organic substances, in treated and untreated wastes, are discharged into the New York estuary. The possible relationship between annual phytoflagellate blooms in Lower New York Bay and the urban hypertrophication was investigated by means of tests of the utilization of a wide variety of organic C, N, and P compounds by the dominant phytoplanktonic organisms. Carbon compounds were tested at 50, 25, and 5 mg C l ; nitrogen compounds at 1.4, 0.7, and 0.14 mg N l ; and phosphorus compounds at 0.5, 0.25, and 0.1 mg P l . The results from the lowest concentration are considered of greatest environmental relevance. At the low concentrations Massartia rotundata (Lohmann) Schiller used 11, Olisthodiscus luteus Carter 14, and Prorocentrum micans Ehrenberg 15 of 20 organic carbon compounds; M. rotundata used 14, O. luteus 7, and P. micans 14 of 16 organic nitrogen compounds; M. rotundata used 6, O. luteus 8, and P. micans 7 of 8 organic phosphorus compounds. These results, together with complementary data indicating utilization of organic substances during blooms, suggest a bloom-hypertrophication association.
Published Version
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