946 resultados para mouth of Shark River
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Caption title.
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1886 includes observations in part of Queensland
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Image taken from photograph album containing views of the Huron River. The album contains copyprints of photographs made by George R. Swain
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Appendix II, "On the natural history of the vicinity," is separately paged.
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Mode of access: Internet.
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Includes bibliographical references and index.
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"Sources of information": p. 6-7.
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Mode of access: Internet.
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Memorial of the people of Red River Settlement.
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"August 1996."
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Referred to the Committee on military affairs and ordered printed with illustrations May 19, 1937.
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Open-file report [no. 4]
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Senior thesis written for Oceanography 445
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The distribution of anaerobic ammonium oxidation (anammox) in nature has been addressed by only a few environmental studies, and our understanding of how anammox bacteria compete for substrates in natural environments is therefore limited. In this study, we measure the potential anammox rates in sediment from four locations in a subtropical tidal river system. Porewater profiles of NOx- (NO2- plus NO3-) and NO2- were measured with microscale biosensors, and the availability of NO2- was compared with the potential for anammox activity. The potential rate of anammox increased with increasing distance from the mouth of the river and correlated strongly with the production of nitrite in the sediment and with the average concentration or total pool of nitrite in the suboxic sediment layer. Nitrite accumulated both from nitrification and from NOx- reduction, though NOx- reduction was shown to have the greatest impact on the availability of nitrite in the suboxic sediment layer. This finding suggests that denitrification, though using NO2- as a substrate, also provides a substrate for the anammox process, which has been suggested in previous studies where microscale NO2- profiles were not measured.