Upward transport of oceanic nitrate by migrating diatom mats
Article Abstract:
The largest known phytoplankton migrate as solitary cells or aggregations (mats) between deep nutrient pools and the surface. This contributes to new production but the significance of this remains uncertain. Rhizosolenia mats were observed using remote video observations, throughout the upper 150 m of the central North Pacific Ocean. It is indicated that Rhizosolenia mats transport 18-97 mumol N m(super12)d(super-1). There is much temporal and spatial variability, but the means of upward nutrient transport seem to be a significant source of new nitrogen to the surface of the ocean.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Nitrogen transport by vertically migrating diatom mats in the North Pacific Ocean
Article Abstract:
Vertical nitrate transport in the North Atlantic, North Pacific and the Indian oceans were observed in Rhizosolenia mats to study the mechanism of nutrient transfer in abundant diatom mats. The study indicated that mats rising to the surface were richer in internal nitrates than those mats which were sinking to the ocean floor. These reuslts indicate that Rhizosolenia mats can provide as mush as 50% of nitrohen requirements of surface water.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Climate-related variations in denitrification in the Arabian Sea from sediment 15N/14N ratios
Article Abstract:
A study of nitrogen isotopes at three sites in the Arabian Sea indicates changes in the 15N/14N values due to climatic variations, as confirmed by the agreement of the variations with Milankovitch cycle values. This implies that subsurface nitrate level and denitrification vary with climate. These factors may have serious implications on the changes in marine biogeochemical cycles.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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