Back from AGU and P symposium

Posted by Jim:

Last week, Amisha, Jess, and I ran a special session (“Phosphorus: From Geochemistry to Genomes to Global Sustainability”) at the annual American Geophysical Union (AGU) meeting in San Francisco.  The largest meeting of earth and environmental scientists in the world (attendance was something like 16,000-18,000 people), this was a good chance to bring together different perspectives on the cycling of phosphorus in the biosphere.  There was both a poster session and an oral session and both included some really interesting results, described below. The full list of posters and talks is given at the bottom.

A highlight of the poster session was PV Sundareshwar‘s presentation on the mechanisms by which the invasive diatom “didymo” (Didymosphenia geminata) produces blooms in low-nutrient streams.  He presented compelling data indicating that the diatom traps P by reacting it with oxidized iron, later releasing the P in reducing conditions inside the biofilm.  Thus, didymo blooms might require the presence of abundant iron supplies, such as in streams draining mining areas or volcanic deposits.  Another interesting poster was presented by SJ Omelon about the process of apatite mineralization in bone.  Also notable was S Chandra‘s report on nutrient limitation in Siberian thermokarst lakes, one of a very large number of papers at the AGU meeting from an impressive group of undergraduates working in Siberia under the mentorship of Chandra, J. Schade, and M. Holmes (among others).

The oral session went from rocks to genes to (global) farms.  GM Fillipelli gave a nice overview about new understanding of the mechanisms of phosphorite formation in modern oceans (and in relation to ancient deposits).  V Souza provided a whirlwind tour of emerging ideas about how P limitation shapes microbial evolution and B Van Mooy gave an update on his work on how phytoplankton cope with P limitation in the open ocean.  The session also included some quite impressive student talks, by A Marklein (soil P enzymes), LE Kinsman (wetland P cycling), and GK MacDonald (global agricultural P imbalances at the farm scale).  All in all, it was a well-rounded session with some interesting common threads (such as the general role of enzymes like alkaline phosphatase in the repertoire of biota in responding to P limitation).

B21C-0327. Can Polyphosphate Biochemistry Affect Biological Apatite Saturation?.  S. J. Omelon; N. Matsuura; I. Gorelikov; C. Wynnyckyj; M. D. Grynpas View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0329. Changes in soil phosphorus fractions following woody plant invasion of grassland.  I. B. Kantola; T. W. Boutton; T. R. Filley; C. T. Hallmark View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0334. Characterization of P status in forest soils: stocks, fluxes and models .  D. L. Achat; C. Morel; M. Bakker; L. Augusto; A. Gallet-Budynek; M. Gonzalez; M. Jonard View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0328. Crossing the pedogenetic threshold: Apparent phosphorus limitation by soil microorganisms in unglaciated acidic eastern hardwood forests..  J. L. Deforest; K. A. Smemo; D. J. Burke View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0333. Ecosystem effects of cultural eutrophication in a large, tropical lake.  J. R. Corman; S. Chandra; C. Davis; M. Dix; N. Gíron; E. Rejmánková; A. Roegner; J. Veselá; J. J. Elser View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0332. Nutrient limitation of a thermokarst lake and large river ecosystem in the Kolyma River basin (Russia).  S. Chandra; J. Heslop; W. V. Sobczak; J. D. Schade; V. Spektor; R. M. Holmes; A. G. Bunn; E. B. Bulygina; K. M. Walter Anthony; K. E. Frey; N. Zimov; S. A. Zimov View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0330. P Limitation and Microbial Biogeochemistry in Acidic Forest Soils of the Northeastern United States.  K. A. Smemo; J. L. Deforest; D. J. Burke; H. L. Elliot; L. A. Kluber; S. R. Carrino-Kyker View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0331. Phosphorus Speciation and Phosphate Oxygen Isotope Systematics of Type Euxinic Marine Deposits from Middle Devonian North America.  C. P. Carney; M. A. Arthur View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0325. The paradox of algal blooms in oligotrophic waters .  P. V. Sundareshwar; S. Upadhyay; M. B. Abessa; S. Honomichl; B. Berdanier; S. Spaulding; C. Sandvik; A. Trennepohl View Pres. Tue, Dec 14
8:00 AM
No itinerary selected
B21C-0326. Using oxygen isotopes of phosphate to investigate phosphate release from sediments and phosphate input from waste water treatment plants into Lake Erie..  K. Roberts; T. Klass; S. Watson; B. Mah; A. Paytan View Pres.
B33K-01. New Insights into an Old Cycle: The Marine Phosphorus Cycle and the Formation of Critical Phosphate Rock Resources (Invited).  G. M. Filippelli View Pres. Wed, Dec 15
1:40 PM
No itinerary selected
B33K-02. Ocean’s 16: Optimal protein:RNA ratio has near Redfield nitrogen:phosphorus ratio.  J. J. Elser; I. Loladze View Pres. Wed, Dec 15
1:55 PM
No itinerary selected
B33K-03. The role of food, sex and travel in the diversity of our planet. (Invited).  V. Souza; L. E. Eguiarte; J. J. Elser; M. Travisano View Pres. Wed, Dec 15
2:10 PM
No itinerary selected
B33K-04. Calculus of P-Acquisition versus P-Sparing by Plankton in the Oligotrophic Ocean (Invited).  B. Van Mooy; S. T. Dyhrman; M. W. Lomas View Pres. Wed, Dec 15
2:25 PM
No itinerary selected
B33K-05. Nitrogen Inputs Stimulate Phosphorus Mineralizing Enzymes across a Wide Variety of Terrestrial Ecosystems.  A. Marklein; B. Z. Houlton View Pres. Wed, Dec 15
2:40 PM
No itinerary selected
B33K-06. Influence of Hydrologic Regime and Biogeochemistry on Sediment Phosphorus Retention and Release Processes in Shallow Freshwater Ecosystems.  L. E. Kinsman; J. O’Brien; S. Robbins; S. K. Hamilton View Pres. Wed, Dec 15
2:55 PM
No itinerary selected
B33K-07. Phosphorus forms and pools in high-elevation soils of the Sierra Nevada: Sensitivity to climate change.  J. O. Sickman; P. M. Homyak; J. M. Melack View Pres. Wed, Dec 15
3:10 PM
No itinerary selected
B33K-08. Mapping Phosphorus Imbalances in Croplands Globally: Too Much or Too Little of a Good Thing?.  G. K. MacDonald; E. M. Bennett; P. Potter; N. Ramankutty View Pres.
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