Catherine A Garcia1, Steven E Baer2,3, Nathan S Garcia1, Sara Rauschenberg2, Benjamin S Twining2, Michael W Lomas2, Adam C Martiny4,5. 1. Department of Earth System Science, University of California at Irvine, Irvine, CA, 92617, USA. 2. Bigelow Laboratory for Ocean Sciences, East Boothbay, ME, 04544, USA. 3. Maine Maritime Academy, Castine, ME, 04420, USA. 4. Department of Earth System Science, University of California at Irvine, Irvine, CA, 92617, USA. amartiny@uci.edu. 5. Department of Ecology and Evolution, University of California at Irvine, Irvine, CA, 92617, USA. amartiny@uci.edu.
Abstract
Variation in ocean C:N:P of particulate organic matter (POM) has led to competing hypotheses for the underlying drivers. Each hypothesis predicts C:N:P equally well due to regional co-variance in environmental conditions and biodiversity. The Indian Ocean offers a unique positive temperature and nutrient supply relationship to test these hypotheses. Here we show how elemental concentrations and ratios vary over daily and regional scales. POM concentrations were lowest in the southern gyre, elevated across the equator, and peaked in the Bay of Bengal. Elemental ratios were highest in the gyre, but approached Redfield proportions northwards. As Prochlorococcus dominated the phytoplankton community, biodiversity changes could not explain the elemental variation. Instead, our data supports the nutrient supply hypothesis. Finally, gyre dissolved iron concentrations suggest extensive iron stress, leading to depressed ratios compared to other gyres. We propose a model whereby differences in iron supply and N2-fixation influence C:N:P levels across ocean gyres.
Variation ipan class="Chemical">n ocean C:N:P of particulate organic matter (POM) has led to competing hypotheses for the underlying drivers. Each hypothesis predicts C:N:P equally well due to regional co-variance in environmental conditions and biodiversity. The Indian Ocean offers a unique positive temperature and nutrient supply relationship to test these hypotheses. Here we show how elemental concentrations and ratios vary over daily and regional scales. POM concentrations were lowest in the southern gyre, elevated across the equator, and peaked in the Bay of Bengal. Elemental ratios were highest in the gyre, but approached Redfield proportions northwards. As Prochlorococcus dominated the phytoplankton community, biodiversity changes could not explain the elemental variation. Instead, our data supports the nutrient supply hypothesis. Finally, gyre dissolved iron concentrations suggest extensive iron stress, leading to depressed ratios compared to other gyres. We propose a model whereby differences in iron supply and N2-fixation influence C:N:P levels across ocean gyres.
Authors: Douglas B Rusch; Adam C Martiny; Christopher L Dupont; Aaron L Halpern; J Craig Venter Journal: Proc Natl Acad Sci U S A Date: 2010-08-23 Impact factor: 11.205
Authors: Katrin Zwirglmaier; Ludwig Jardillier; Martin Ostrowski; Sophie Mazard; Laurence Garczarek; Daniel Vaulot; Fabrice Not; Ramon Massana; Osvaldo Ulloa; Dave J Scanlan Journal: Environ Microbiol Date: 2007-09-27 Impact factor: 5.491
Authors: Pedro Cermeño; Stephanie Dutkiewicz; Roger P Harris; Mick Follows; Oscar Schofield; Paul G Falkowski Journal: Proc Natl Acad Sci U S A Date: 2008-12-15 Impact factor: 11.205
Authors: Catherine A Garcia; George I Hagstrom; Alyse A Larkin; Lucas J Ustick; Simon A Levin; Michael W Lomas; Adam C Martiny Journal: Philos Trans R Soc Lond B Biol Sci Date: 2020-03-23 Impact factor: 6.237