Blue-green algal responses to some organic-nitrogen substrates

Wyatt, J. T.; Lawley, Gary G.; Barnes, Robin

doi:10.1007/bf00598729

Cited by 15 publications

(3 citation statements)

References 5 publications

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“…Nitrogen fixation in the south sector of Kaneohe Bay is probably not influenced by the concentration of combined nitrogen in the water, as evident from the fixation on the reefs and the inorganic nitrogen concentrations in the water over the reefs in the middle sector. There has been considerable evidence that organic and inorganic compounds in sewage, industrial wastes, and runoff from domestic and agricultural land inhibit nitrogen fixation by blue-green algae (11,21,23,31). Heavy metals, herbicides and insecticides, hydrocarbons, and various other toxic materials are potential inhibitors of the process and are no doubt widely distributed in Kaneohe Bay.…”

Section: Discussionmentioning

confidence: 99%

“…Dried coral fragments were pulverized, and 100-g samples were dissolved in 10% HF, centrifuged, and neutralized (pH VOL. 31,1976 on September 9, 2020 by guest http://aem.asm.org/ Downloaded from 944 HANSON AND GUNDERSEN 7.0). The dissolved organic nitrogen was digested in a micro-Kjeldahl, and the NH4 was converted to N2 with alkaline potassium bromide.…”

Section: Methodsmentioning

confidence: 99%

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Influence of sewage discharge on nitrogen fixation and nitrogen flux from coral reefs in Kaneohe Bay, Hawaii

Hanson¹,

Gundersen²

1976

Appl Environ Microbiol

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Nitrogen fixation was investigated in Kaneohe Bay, Oahu, Hawaii, a subtropical eutrophic estuary, by using the acetylene reduction technique on algal samples. No active, planktonic, N2-fixing blue-green algae or bacteria were observed. However, Calothrix and Nostoc capable of fixing N., were cultured from navigational buoys and dead coral heads. Nitrogen fixation associated with these structures was greater in the middle sector than in the south and north sectors of the estuary. Experiments demonstrated that the fixation was photosynthetically dependent. Examination of the data showed that there was no significant correlation between rates of nitrogen fixation and concentration of combined nitrogen compounds in the Bay water. Fixation was significantly correlated to the inorganic N/P (atomic) ratio in the south and middle sectors but not in the north sector. The nutrient data indicate there was a flux of combined nitrogen, but not phosphate, from the reef flats. Nitrogen fixation by the planktonic microorganisms has been reported for open ocean (8,

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Influence of sewage discharge on nitrogen fixation and nitrogen flux from coral reefs in Kaneohe Bay, Hawaii

Hanson¹,

Gundersen²

1976

Appl Environ Microbiol

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“…The occurrence of urease in blue-green algae (57) explains the ability of various of these algae to utilize urea as a nitrogen source (6,31,144,465,833; cf., however, 65). The metabolic products of "4C-urea resemble those of G4CO2 except for lesser labeling of glutamate and aspartate and greater labeling of glutamine and asparagine (18), presumably due to concomitant incorporation of urea-derived NH3.…”

Section: N2 Fixedmentioning

confidence: 99%