Discuss primary production - PowerPoint PPT Presentation
Lecture Goals
Lecture Goals. To review the concept of trophic structure – how energy moves through ecosystems. To discuss primary production in freshwater ecosystems – who does it, how do they do it, and what controls it. Lindemann RL. 1942. The trophic-dynamic aspects of ecology. Ecology 23: 399-418.
By montana-griffith
Lecture Goals
Lecture Goals. To review the concept of trophic structure – how energy moves through ecosystems. To discuss primary production in freshwater ecosystems – who does it, how do they do it, and what controls it. Lindemann RL. 1942. The trophic-dynamic aspects of ecology. Ecology 23: 399-418.
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Primary Production
Primary Production. What Controls 1 º Production? Seasonal Succession in a Lake How to Measure 1 º Production. Controls of 1 º Productivity (Net Photosynthesis). Tolerance to physicochemical conditions. Light Turbulence Nutrients Grazing. Net P = Gross P – Respiration
Primary Production
Primary Production. Global chlorophyll concentrations for Oct. 2000. Feb 5, 1998: uniformly low pigment concentrations during all seasons. Primary Productivity. Photosynthesis Involves the use of light energy in the conversion of inorganic carbon into organic carbon.
Primary Production
Primary Production. What Controls 1 º Production? Seasonal Succession in a Lake How to Measure 1 º Production. Controls of 1 º Productivity (Net Photosynthesis). Tolerance to physicochemical conditions. Light Turbulence Nutrients Grazing. Net P = Gross P – Respiration
Primary production
Primary production. Is the production of organic matter by plants which utilize the sun’s energy to make sugar. Primary producers in the coastal ocean include seaweeds (e.g. kelp beds), seagrasses, and microscopic algae called phytoplankton.
Primary Production
Primary Production. Production: Formation of Organic Matter. Autotrophic Organisms (Plants, algae and some bacteria) Photosynthesis Chemosynthesis CO 2 + Electron Donor + energy CH 2 O + other Heterotrophic Organisms (most bacteria and animals)
Primary Production Landscapes
Primary Production Landscapes. A Regional Basis for Understanding and Planning Farming Systems in Victoria. Primary Production Landscapes. Our Landscapes Victorian landscapes have diverse vegetation, terrain, soils and climate. Our Farming Systems
Gross Primary Production
Gross Primary Production. Net photosynthesis at the ecosystem scale is GPP = Carbon Input to Ecosystems. = Sum of Ps over space and time. Levels of control Controls in individual leaves Control by canopy processes Controlling factors Direct controls: CO 2, light
Photosynthesis (Primary Production)
Photosynthesis (Primary Production). Requirements for photosynthesis: sunlight (and chlorophyll to capture energy) nutrients (nitrogen, phosphorus..), space CO 2 + H 2 O C 6 H 12 O 6 + O 2 + H 2 O. photosynthesis. respiration. sugars, fixed carbon.
Photosynthesis (Primary Production)
Photosynthesis (Primary Production). Requirements for photosynthesis: sunlight (and chlorophyll to capture energy) nutrients (nitrogen, phosphorus..), space CO 2 + H 2 O C 6 H 12 O 6 + O 2 + H 2 O. photosynthesis. respiration. sugars, fixed carbon.