1. A nutrient limitation mosaic in the eastern tropical Indian Ocean
- Author
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Twining, Benjamin S, Rauschenberg, Sara, Baer, Steven E, Lomas, Michael W, Martiny, Adam C, and Antipova, Olga
- Subjects
Nutrition ,Life Below Water ,Indian ocean ,Trace metal ,Nutrient limitation ,Phytoplankton ,Cell quotas ,Geochemistry ,Oceanography ,Ecology - Abstract
The Indian Ocean accounts for about one fifth of global ocean net primary production but remains undersampled relative to other major ocean basins. The eastern tropical Indian Ocean is characterized by extremely low concentrations of both macronutrients and the micronutrient iron. We measured concentrations of dissolved and particulate trace metals (Fe, Mn, Zn, Pb) in the upper ocean along the GO-SHIP IO9N transect (28˚S to 17˚N, mostly along the 95˚E meridian) during a cruise in April 2016. Cellular quotas (metal/C) of Fe, Mn, Co, Ni, Cu, and Zn were measured in small eukaryotic flagellates (2–7 μm). Deckboard bottle incubation experiments were conducted at one station in each of three putative biogeochemical regions: southern Indian Ocean gyre (SIO, 28-10˚S); equatorial Indian Ocean (EqIO, 10˚S - 5˚N); Bay of Bengal (BoB, 5-17˚N). Nitrate and phosphate were below detection limits in surface waters across the transect. Dissolved and particulate Fe were
- Published
- 2019