Nathan Geraldi

Postdoctoral Fellows


My research broadly focuses on understanding of community dynamics and how ecosystems are altered by anthropogenic impacts. I study community dynamics in broad array of marine habitats, such as bivalve reefs, the intertidal zone, hard-bottom reefs, and coral reefs using many techniques including eDNA, inclusion/exclusion manipulations, mesocosm experiments, and traditional and acoustic tagging. I attempt to always have an applied side to my research so that it can be used for conservation strategies and restoration efforts.

Research Interests

Marine Ecology, Fisheries, Food web interactions, Invasive Species, Anthropogenic impacts

Selected Publications

Prey size structure diminishes cascading effects by increasing interference competition and predation among prey. 

N. R. Geraldi

Ecology 96:2533-2543 (2015)


Artificial substrates enhance non-native macroalga and N2 production.

N.R. Geraldi, A. R. Smyth, M. F. Piehler, and C. H. Peterson. 

Biological Invasions 16: 1819-1831 (2014)


Oyster-mediated benthic-pelagic coupling modifies nitrogen pools and processes. 

A. R. Smyth, N. R. Geraldi, and M. F. Piehler. 

Marine Ecology Progress Series 493:23–30. (2013)


When a trap is not a trap: converging entry and exit rates and their effect on trap saturation of black sea bass (Centropristis striata). 

N. M. Bacheler, Z. H. Schobernd, D. J. Berrane, C. M. Schobernd, W. A. Mitchell, and N. R. Geraldi. 

Ices Journal of Marine Science 70:873–882. (2013)


Addition of juvenile oysters fails to enhance oyster reef development in Pamlico Sound. 

N. R. Geraldi, M. Simpson, S. R. Fegley, P. Holmlund, and C. H. Peterson. 

Marine Ecology Progress Series 480:119–129. (2013)


Restricting prey dispersal can overestimate the importance of predation in trophic cascades. 

N. R. Geraldi and P. I. Macreadie. 



How small-scale variation in oyster reef patchiness influences predation on bivalves. 

P. I. Macreadie, N. R. Geraldi, and C. H. Peterson. 

Marine Ecology Progress Series 429:87–91. (2011)


Subtle changes in prey foraging behavior have cascading effects in a shallow estuary. 

N. R. Geraldi and S. P. Power


Marine Ecology Progress Series 427:51–58. (2011)


Can habitat restoration be redundant? Response of mobile fishes and crustaceans to oyster reef restoration in marsh tidal creeks. 

N. R. Geraldi, S. P. Powers, K. L. Heck, and J. Cebrian. 

Marine Ecology Progress Series 389:171–180. (2009)


Habitat effects on American lobster (Homarus americanus) movement and density: insights from georeferenced trap arrays, seabed mapping, and tagging.
N. R. Geraldi, R. A. Wahle, and M. J. Dunnington.
Canadian Journal of Fisheries & Aquatic Sciences 66:460–470. (2009)


- Ph.D, Marine Science, University of North Carolina, NC, USA 2012
- M.Sc. Marine Science, University of South Alabama and Dauphin Island Sea Lab, Mobile, AL, 2006
- B.Sc. Marine Biology, University of Maryland, College Park, MD, 2000

Professional Profile

2013-2015: Queens University Postdoctoral Researcher, Belfast, Northern Ireland, UK

2012-2013: National Research Council Postdoctoral Fellow, NOAA/NMFS, Beaufort, North Carolina, USA

2006-2007: Research Technician – Dauphin Island Sea Lab, AL, USA

2001-2003: Island Institute Fellow - Island Institute, Rockland, Maine, USA         

Scientific and Professional Memberships

Ecological Society of America

KAUST Affiliations

Red Sea Research Center (RSRC) - Division of Biological and Environmental Sciences and Engineering (BESE)​​