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DistingAllerRuished Professor

Ph.D., 1977, Yale University

Marine biogeochemistry, marine animal-sediment relations




Research Interests

I am interested in early diagenetic reactions and elemental cycling involving the decomposition of organic matter, dissolution of inorganic biogenic debris, and the mobilization -reprecipitation of metals sensitive to oxidation-reduction. These reactions are most intense and rapid in the upper meter, and especially in the upper few centimeters, of marine sediment. It is in this upper zone where most benthic organisms live and interact with sediments and where exchange of material between sediment and overlying water is largely determined. Knowledge of early diagenetic processes occurring in this zone is, therefore, essential for understanding elemental cycling in sediments and overlying water, certain ecological interactions and adaptations of marine organisms, and the long-term recording of historical information in marine deposits, for example, fossil preservation.

My students and I are currently studying diagenetic processes, mineral authigenesis, and exchange rates of dissolved material across the sediment-water interface in a variety of coastal and deep-sea marine areas, including Long Island Sound, French Guiana (Amazon – Guianas mobile mudbelt), and Papua New Guinea. One major part of our research involves the development and application of 2-dimensional optical sensors for examination of biogeochemical heterogeneity and dynamics in the complex bioturbated zone. For example, we have recently developed pH and pCO2 sensors which allow unprecedented resolution of biogeochemical reactions and solute transport patterns associated with biogenic structures. A second major emphasis of our research is on large scale diagenetic patterns related to physically energetic sedimentary facies (mobile mud belts) and authigenic mineral formation, particularly Fe-rich clays (reverse weathering) and Fe-carbonates, in tropical deltaic systems. These deltaic deposits contrast dramatically with bioturbated sediments and are dominated by physical mobilization of massive quantities of sedimentary debris. They are of extraordinary importance to elemental cycling and organic matter remineralization or storage globally.

We have collaborative projects with other SoMAS and SUNY faculty as well as with colleagues at other institutions, including Josephine Aller, J. Kirk Cochran, Cindy Lee, John Mak, Qingzhi Zhu, and Richard Reeder (Geosciences), Neal Blair (NCSU); Gregg Brunskill (AIMS, Townsville, AU), Frédéric Baltzer (Univ. Paris), Yanzhen Fan (OSU), Franck Gilbert (Univ. Marseilles), Stefan Hulth (Göteborg Univ.), Charles Nittrouer (Univ. Washington), and Donald Rhoads (Woods Hole). Several of our ongoing research projects are listed here:

  1. Development and use of planar optode sensors for in situ (SPI hyperspectral camera system – Chem-SPI – collaboration with D.C. Rhoads) and 2-D laboratory microcosm measurement of solute, solid, and microbial enzyme activity distributions.
  2. Organic matter remineralization, suboxic reactions, and rates and kinetics of authigenic mineral dissolution-precipitation (particularly Fe-rich clays (reverse weathering reactions), carbonates, sulfur, biogenic silica) in tropical deltaic mobile mud facies and their impact on global biogeochemical cycles.
  3. Animal-sediment interactions, particularly biogeochemical, of macrobenthos living in soft-bottom regions of the sea floor.
  4. Studies of diffusion coefficients and exoenzyme activity in biogenic mucoid secretions.
  5. Effects of macrobenthic organisms on microbial metabolic activity and on the rate and distribution of biogenic and abiogenic reactions in the bioturbated zone of sediments.

Selected Publications
(a complete list can be obtained by request)

Michaud, E., G. Desrosiers, R. C. Aller, F. Mermillod-Blondin, B. Sundby, and G. Stora, 2009, Spatial interactions in the Macoma balthic community control biogeochemical fluxes at the sediment-water interface and microbial abundances. J. Mar. Res. 67, 43-70.

Aller, R. C., N. E. Blair, and G. J. Brunskill, 2008, Early diagenetic cycling, incineration, and burial of sedimentary organic C in the central Gulf of Papua (Papua New Guinea). J. Geophys. Res., 113, F01S09, doi:10.1029/2006JF000689.

Aller, R.C. and N.E. Blair, 2006. Carbon remineralization in the Amazon – Guianas mobile mudbelt: a sedimentary incinerator. Cont. Shelf Res. 26, 2241-2259.

Madrid, V. M, R.C. Aller, J.Y. Aller, and A. Y. Chistoserdov. 2006, Evidence of the activity of dissimilatory sulfate-reducing prokaryotes in nonsulfidogenic tropical mobile muds. FEMS Microbiol Ecol. 57, 169-181.

Zhu, Q., R.C. Aller, and Y. Fan, 2006. Two-dimensional pH distributions and dynamics in bioturbated marine sediments. Geochim. Cosmochim. Acta . 70, 4933-4949.

Zhu, Q., R.C. Aller, and, Y. Fan, 2006. A new ratiometric, planar fluorosensor for measuring high resolution, two-dimensional pCO2 distributions in marine sediments. Marine Chemistry 101, 40-53

Zhu, Q., R.C. Aller, and Y. Fan, 2005. High-performance planar pH fluorosensor for two-dimensional pH measurements in marine sediment and water. Environ. Sci. Technol. 39, 8906-8911.

Hannides, A. K., S.M. Dunn, and R.C. Aller, 2005. Diffusion of organic and inorganic solutes through macrofaunal mucus secretions and tube linings in marine sediments. J. Mar. Res. 63, 957-981.

Aller, R.C., 2004. Conceptual models of early diagenetic processes: the muddy seafloor as an unsteady, batch reactor. J. Mar. Res. 62, 815-835.

Aller, R.C., C. Heilbrun, C. Panzeca, Z.-B. Zhu, and F. Baltzer, 2004. Coupling between sedimentary dynamics, early diagenetic processes, and biogeochemical cycling in the Amazon-Guianas mobile mud belt: coastal French Guiana. Marine Geology, 208, 331-360.

Michalopoulos, P. and R.C. Aller, 2004. Early diagenesis of biogenic silica in the Amazon Delta: alteration, authigenic clay formation, and storage. Geochim. Cosmochim. Acta 68, 1061-1085.

Aller, R.C., A. Hannides, C. Heilbrun, and C. Panzeca. 2004. Coupling of early diagenetic processes and sedimentary dynamics in tropical shelf environments: The Gulf of Papua deltaic complex. Cont. Shelf Res. 24, 2455-2486.

Aller, J.Y. and R.C. Aller, 2004.Physical Disturbance creates bacterial dominance of benthic biological communities in tropical deltaic environments of the Gulf of Papua. Continental Shelf Research, 24, 2395-2416

Ingalls, A. E., R.C. Aller, C. Lee, S. Wakeham, 2004. Organic matter diagenesis in calcium carbonate sediments. Geochim. Cosmochim. Acta. 68, 4363-4379.

D’Andrea, A., G. Lopez, and R.C. Aller, 2004. Rapid physical and biological particle mixing on an intertidal sandflat. J. Mar. Res., 62,67-92.

Aller, R.C. and N. E. Blair, 2004. Early diagenetic remineralization of sedimentary organic C in the Gulf of Papua deltaic complex (Papua New Guinea): net loss of terrestrial C and diagenetic fractionation of C isotopes. Geochim. Cosmochim. Acta. 68, 1815-1825.

Blair, N.E., E.L. Leithold, and R.C.Aller, 2004. From bedrock to burial: the evolution of particulate organic carbon acrosscoupled watershed-continental margin systems. Mar. Chem. 92, 141-156.

McKee, B. A., R.C. Aller, M. A. Allison, T. A. Bianchi, and G. C. Kineke, 2004. Transport and transformation of dissolved and particulate materials on continental margins influenced by major rivers: benthic boundary layer and seabed processes. Cont. Shelf Res. 24(7-8), 899-926.

Gilbert, F., R.C. Aller, and S. Hulth, 2003. The influence of macrofaunal burrow spacing and diffusive scaling on sedimentary nitrification and denitrification: An experimental and model approach. J. Mar. Res. 61, 101-125.

Hulth, S., R.C. Aller, P. Engström, and E. Selander, 2002. A pH plate fluorosensor (optode) for early diagenetic studies of marine sediments. Limnol. Oceanogr. 47, 212-220.

Aller, R.C., 2001, Transport and reactions in the bioirrigated zone. In: The Benthic Boundary Layer: Transport processes and biogeochemistry. (B. P. Boudreau and B.B. Jorgensen, eds.). Oxford Press, Oxford. 269-301.


Celebrating the Class of 2020 – SoMAS Convocation

Congratulations to our graduates!  The annual SoMAS Convocation occurred virtually for the first time on Friday, May 22, 2020 on the SoMAS website, Facebook and YouTube. Students gathered with their friends and family and SoMAS faculty, staff, and fellow students to...

SoMAS Convocation 2019

Photo above: Dean Shepson welcomes the Class of 2019 at the SoMAS Convocation. Congratulations to our graduates!  The annual SoMAS Convocation occurred on Friday, May 24, 2019 at the Center for Leadership and Service. Students gathered with their friends and family...

SoMAS Convocation 2018

Congratulations to our graduates!  The annual SoMAS Convocation occurred on Friday, May 18, 2018 at the Student Activities Center auditorium. Students gathered with their friends and family and SoMAS faculty and staff to celebrate the completion of their journey at...

Vax to Flax 2018

Many thanks to those who participated and assisted with the 2018 Flax to Vax Race + BBQ on Saturday April 28th! The overall winner was student Tim Curtin with a time of 26:13. The faculty winner was Chris Gobler with a time of 26:24. The faculty "won" the...

Souper Bowl IV Competition Continues and Everyone Wins

Souper Bowl IV continued as a gustatory and financial success, raising $349.00 for the Nuria Protopopescu Memorial Fund. Congratulations and thanks to the culinary contributers: Josie Aller - Turkish Lentil Soup. Megan Hahn - Kale, Sausage, and Bean Soup....

SoMAS Research featured as EOS Research Spotlight

The recent publication by SoMAS alum Shaily Rahman (PhD, 2016) and her advisors, Robert Aller and J. Kirk Cochran: "The Missing Silica Sink: Revisiting the Marine Sedimentary Si Cycle Using Cosmogenic 32Si" published in Global Biogeochemical Cycles 31, 1559 - 1578, is...

SoMAS Convocation 2017

Congratulations to our graduates!  The annual SoMAS Convocation occurred on Friday, May 19, 2017 at the Student Activities Center auditorium. Students gathered with their friends and family and SoMAS faculty and staff to celebrate the completion of their journey at...

Vax to Flax 2017

Many thanks to those who participated and assisted with the 2017 Flax to Vax Race + BBQ on Saturday. Heather Lynch and Kurt Bretsch won for the faculty and Mark Nepf and Ashley Cohen won for the students. Overall the top five faculty times beat the top ten student...

News from the NAno-Raman Molecular Imaging Laboratory (NARMIL)

In September, we celebrated the first anniversary of Ms. Tanya Zaliznyak joining the SoMAS staff and taking the helm at NARMIL.  Her first year has been filled with exciting accomplishments demonstrating that this facility is reaching its scientific potential. We’d...

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