Primary production Primary production rates under varying rates under varying light, temperature light, temperature and biomass and biomass conditions conditions Michael D. Yard Michael D. Yard Dean W. Blinn Dean W. Blinn Northern Arizona University Northern Arizona University
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Primary production rates under varying light, temperature and biomass conditions Michael D. Yard Dean W. Blinn Northern Arizona University.
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Primary production rates under Primary production rates under varying light, temperature and varying light, temperature and
biomass conditionsbiomass conditions
Michael D. YardMichael D. YardDean W. BlinnDean W. Blinn
Northern Arizona UniversityNorthern Arizona University
Determine primary production rates for the Determine primary production rates for the phytobenthic community under a range of phytobenthic community under a range of
environmental conditionsenvironmental conditions
• Light and temperatureLight and temperature
• Determine how production Determine how production rates responded to these rates responded to these same factors under greater same factors under greater biomass accumulation.biomass accumulation.
• Develop a production model Develop a production model to estimate standing biomass to estimate standing biomass accrualaccrual
Photosynthesis is a light driven Photosynthesis is a light driven Re/dox ProcessRe/dox Process
• Acclimated to prescribed temperatureAcclimated to prescribed temperature– 48 h minimum 48 h minimum – Recirculating pumpsRecirculating pumps– Maintain temperature (±1CMaintain temperature (±1Coo))– WQ (pH, nutrients & temp)WQ (pH, nutrients & temp)
• Samples Samples – 3 to 4 cobbles per chamber 3 to 4 cobbles per chamber – 3 replicates per sample3 replicates per sample– 30 samples per temperature30 samples per temperature
• Closed system Closed system – Lexan chambers Lexan chambers (25cm x 22cm)(25cm x 22cm)
– 30 L capacity30 L capacity– O-rings sealsO-rings seals
• Internal recirculating pumpInternal recirculating pump– Inline pumps Inline pumps – Flow rate 50 L / minFlow rate 50 L / min
• Oxygen generation Oxygen generation was monitored was monitored – YSI DO sensor (3)YSI DO sensor (3)
– Data logger, YSI-Data logger, YSI-Model 52 (3)Model 52 (3)
• Digitally loggedDigitally logged– Time interval, 1 min Time interval, 1 min
• Allen Haden, Ally Martinez, Molly McCormick, Ian McKinnon, Kim Pomeroy, Joe Shannon, Kevin Wilson, & Allen Haden, Ally Martinez, Molly McCormick, Ian McKinnon, Kim Pomeroy, Joe Shannon, Kevin Wilson, & Nathan ZorichNathan Zorich
– FacultyFaculty• Michael Kearsley, George Koch, Peter Price, & Rod Parnell Michael Kearsley, George Koch, Peter Price, & Rod Parnell
– Instrumentation LabInstrumentation Lab• Charlie BrittonCharlie Britton
• Grand Canyon Monitoring and Research CenterGrand Canyon Monitoring and Research Center• Dave Baker, Carol Fritzinger, Barry Gold, Susan Hueftle, Barbara Ralston, & Jake TiegsDave Baker, Carol Fritzinger, Barry Gold, Susan Hueftle, Barbara Ralston, & Jake Tiegs
• Mayorga’s WeldingMayorga’s Welding• Frank MayorgaFrank Mayorga
• Humphrey Summit SupportHumphrey Summit Support• Alida Dierker, Brian Dierker, Daniel Dierker & Chris MacIntoshAlida Dierker, Brian Dierker, Daniel Dierker & Chris MacIntosh
• Indispensable InsistenceIndispensable Insistence• Helen YardHelen Yard