Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental...

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Open Oceans: Pelagic Ecosystems III

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Page 1: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Open Oceans: Pelagic Ecosystems III

Page 2: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Comparing the makeup of water and plankton

• Mean Elemental Ratios of N, and P• Organisms: 16.0N / 1P• Sea Water: 14.7N / 1P

• On average, seawater lacks sufficient organic N to take advantage of the available phosphorus

Page 3: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Limited water mixing further limits nutrient availability

Page 4: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Testing models: measuring plankton in open oceans

• Techniques for studying plankton consumers

• Plankton levels may be dropping (NASA study)

http://coexploration.org/bbsr/classroombats/html/body_virtual_plankton_tow.html
Page 5: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Changes in Productivity

                      

http://www.gsfc.nasa.gov/gsfc/earth/pictures/20020801plankton/pacificm.jpg
Page 6: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

From productivity to food webs: A size-based pelagic food web

Page 7: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Grazing pressure

Page 8: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Limits & Flows of NPP

Page 9: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Marine “Snow”

krill

Page 10: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

A spatially realistic pelagic food web

Page 11: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

What are links among trophic levels in pelagic systems?

Page 12: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Large phytoplankton vary with depth

Page 13: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Nutrient distribution with depth

Page 14: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Distribution of food web biomass

Page 15: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

The global nitrogen cycle

Page 16: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Influences on biologically useful Nitrogen

Page 17: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.
Page 18: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.
Page 19: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Diatom mats can migrate vertically

Page 20: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Consequences of active transport of NO3

Page 21: Open Oceans: Pelagic Ecosystems III. Comparing the makeup of water and plankton Mean Elemental Ratios of N, and P Organisms: 16.0N / 1P Sea Water: 14.7N.

Links to oceanic nekton


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