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Aggregation in Phosphate Limited Versus Replete Cultures of Marine Synechococcus

Aggregation in Phosphate Limited Versus Replete Cultures of Marine Synechococcus. Kimberly Mohabir Mentor: Susanne Neuer School of Life Sciences Arizona State University. The Biological Carbon Pump. Background. Proterozoic Ocean No eukaryotes present, only prokaryotic primary producers

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Aggregation in Phosphate Limited Versus Replete Cultures of Marine Synechococcus

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  1. Aggregation in Phosphate Limited Versus Replete Cultures of Marine Synechococcus Kimberly Mohabir Mentor: Susanne Neuer School of Life Sciences Arizona State University

  2. The Biological Carbon Pump

  3. Background • Proterozoic Ocean • No eukaryotes present, only prokaryotic primary producers • Prokaryotic primary producers thought to be the ancestors of today’s cyanobacteria • Use of Synechococcus as a model organism

  4. Objective • To determine the difference in aggregation and settling rates between nutrient replete and phosphate limited cultures of Synechococcus

  5. Methods • Phosphate limited culture vs. replete culture • 3 treatments from each culture • 0, 8, and 24 hours of rolling • Settling for 8 hours • Sinking rates, aggregate abundance, and equivalence spherical diameter (ESD) determined

  6. Results: Aggregate Abundance During Rolling

  7. Results: Settling Experiments Replete Culture Phosphate Limited Culture

  8. Conclusions • Large aggregates sink faster • Play important role in biological carbon pump • Relatively low settling rates • small early carbon export in Proterozoic Ocean • No difference in aggregation between nutrient limited and replete cultures

  9. Acknowledgements • Wei Deng and Dr. Susanne Neuer • The Neuer lab • NASA Space Grant at ASU

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