Marine Ecological Laboratory Dabin Lee

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Presentation transcript:

Marine Ecological Laboratory 201582170 Dabin Lee Ammonium inhibition of nitrate uptake by phytoplankton in the Amundsen Sea, Antarctica Marine Ecological Laboratory 201582170 Dabin Lee

Limiting factors influence on primary production Most aquatic ecosystems are limited by the light, oxygen, and nutrients Nitrogen is major limiting nutrients in the ocean environment http://schoolworkhelper.net/biotic-and-abiotic-factors-influence-on-ecosystems/ https://www2.bc.edu/~strother/GE_146/labs/lab7/

Nitrogen cycle in marine ecosystem Ammonium (NH4+) formed by N-fixation and Decomposition of organisms Primary production based on NO3- and NH4+ called as ‘new production’ and ‘regenerated production’ http://wetlandinfo.ehp.qld.gov.au/wetlands/ecology/aquatic-ecosystems-natural/palustrine/saline-swamp/nutrients.html https://en.wikipedia.org/wiki/F-ratio

New and regenerated production New primary production = Total primary production – regenerated production New production contribute to export of production http://kodu.ut.ee/~olli/eutr/html/htmlBook_63.html

Interaction between ammonium and nitrate uptake No nitrate uptake above a threshold ammonium concentration (R. Dugdale et al., 2012) Small amounts of ammonium may stimulate nitrate uptake (Q Dortch, 1990) Evidence for the negative effect of ammonium (Q Dortch, 1990) 1) Laboratory studies (reviewed in Morris 1974) 2) Early field studies 3) Theoretical considerations NH4+ Concentration-dependent NH4+ uptake Inhibition of NO3- uptake Stimulation of NO3- uptake

Nitrate uptake in the HNLC regions The low rates of nitrate (NO3-) uptake in the Southern Ocean and other HNLC regions ; have often been explained by ammonium inhibition of NO3- utilization (Smith and Nelson, 1990; Wheeler and Kokkinakis, 1990; Price et al., 1994)

Objective 1 Define the relationship between nitrate and ammonium in the Amundsen Sea 2 Find the threshold ammonium concentration that can inhibit nitrate uptake 3 Quantify the inhibition effects of ammonium on nitrate uptake by phytoplankton

Study Area Regional comparison; open water, marginal ice zone, polynya, ice shelf

Method 1L polycarbonate bottle control 1 μM 2 μM 3 μM 5 μM 10 μM 100% 30% 1% Ammonium gradient All samples enriched with stable isotope tracer (13C + 15NO3)

Method Isotope ratio mass spectrometry 25mm GF/F filter paper Incubated samples 47mm GF/F filter paper High performance liquid chromatography

Expected results Nitrogenous nutrients utilization shifting C. Tungaraza et al. (2003) Nitrogenous nutrients utilization shifting Shift patterns according to community structure Predict the change of community structure by climate change W.P. Cochlan and D.A. Bronk (2003)

Thank you!