ed.proffitt @tamucc.edu
COASTAL ECOLOGY & GENETICS LAB
Texas A&M University - Corpus Christi: Marine Biology Program
COASTAL ECOLOGY & GENETICS LAB
Estuaries and barrier islands are beautiful, dynamic, and complex ecosystems. Understanding the driving forces and interplay among species is a fundamental goal of our lab. We use a combination of experimental and observational approaches. We apply advanced multivariate statistical analyses such as Structural Equation Modeling to explore hypotheses. Learn more about our research and areas of study below.
We are broadly interested in assessing plant and animal populations and assemblages in intertidal and shallow subtidal systems and the effects of changing climate on these systems. Projects are primarily in Texas and Florida, and we have close ties with mangrove researchers in China. Genetic evaluations of mangrove connectivity and diversity has spanned the Caribbean and links also to west Africa. Some example programs are illustrated below. PROSPECTIVE STUDENTS, please consider the Texas A&M - Corpus Christi Marine Biology MS or PhD programs; or the Biology MS program; or the Fisheries & Mariculture MS program. http://sci.tamucc.edu/LSCI/MARB/index.html
Marsh-Mangrove Interactions
May 2020
Tropical mangroves are colonizing temperate salt marshes as the rate and intensity of winter freezes declines with global climate change. We are assessing the facilitative and competitive interactions among these plant species
Oyster Ecology & Restoration
May 2020
We study oyster colonization and the rate of sedimentation (assessed here using a shallow SET or Sediment Elevation Table)
Seagrass Dynamics
April 12, 2025
With work previously done by a former lab member, we have developed a powerful tool for use in the identification and characterization of the processes in our model system. A major advantage of this development is its improved sensitivity, which allows it to detect subtle dynamic property changes in response to our experimentation.
Mangrove - Oyster Foundation Species
May 2020
We are studying the effects of a primary foundation species (red mangroves) on a secondary foundation species (oysters and other encrusting organisms on prop roots). Some of this work in by FAU graduate students Jessene Aquino-Thomas and Krystyna Powell.
Marsh-Mangrove Diversity Greenhouse Experiment
May 2020
In association with former PhD student Glenn Coldren, we study the interactions between marsh plants and mangrove seedlings along a temperature gradient
Hermit Crab, Gastropod, and Oyster Interactions
April 12, 2025
We still have only a very limited understanding of most aspects about our planet. Answering questions about this is essential for understanding the mechanistic role it plays on other scientific processes, and for developing tools to further explore this research avenue with more sensitive measurements and improved data collection.
Assessing subsidence and erosion in coastal wetlands
April 12, 2020
We have a grant from the Texas General Land Office to install Sediment Elevation Tables and Marker Horizons (SET) all along the Texas coastal zone. This example is from The Nature Conservancy's Coen Preserve.
Mangrove - marsh & nutrients
May 2020
Field experiment on the effects of nutrients on mangrove growth, reproduction, and recruitment. Also, we are studying the extent and rate of replacement of salt marsh by mangroves in Corpus Christi Bay
Want to learn more about our research projects?
PEOPLE
The research Dream Team: studying red mangrove northern limits in the St. Augustine, FL area
Dr. Ed Proffitt
Principal Investigator
Professor in the Department of Life Sciences.  Marsh & mangrove population and community ecology. Invertebrate ecology. Interactions among ecological "foundation species." Application of multivariate analyses to ecological questions.
Dr. Donna Devlin
Principal Investigator
Mangrove genetic connectivity and diversity. Â Parasitism and herbivory by herbivores on mangroves. Restoration ecology.
Dr. Carolyn Weaver
Former post-doctoral Researcher
Carolyn started an exciting new job as an Assistant Professor at Millersville University in August 2020. While she was in our lab, she was engaged in several projects most notably assessing the effects of Winter Storm Inga (Jan. 2017) hard freezes on mangrove populations in Texas.
Mikaela Ziegler
Masters Student (graduated summer 2018)
Mikaela was Donna and my first student at TAMUCC. She studied marsh - mangrove interactions in the Laguna Madre and Oso Bay sites. She's now working in natural resource conservation for the state of Hawaii.
Simen Kaalstad
MS student
Simen (right in photo serving as TA for Marine Botany) is studying the estuarine fish Fundulus and its use of marsh vs mangrove sites.
Sophia Hoffman
MS student
Sophia graduated with her MS began a new job in July 2020 working at Florida International University focusing on the Everglades. More recently, she has begun a new job at the Virginia LTER. At TAMUCC, her thesis focused on the effects of freezing temperatures, maternal tree fertilization, and seedling soil fertilization on mangrove recruitment. A publication from her research is listed.
Jake Doty
MS student
Jake is working on the SET Project, and is studying mangrove traits that may support their expanding populations in Texas. He finished his MS and has begun working on a PhD in our lab
Ryan Fukawa
MS student
Ryan (L) has worked on the SET project and studied Brazilian Pepper (Schinus terebenthifolius) in the Coastal Bend. He has moved on to a good job in the field.
![20230419_091235[1].jpg](https://static.wixstatic.com/media/24b0cb_c713ef777f614a56be2435184325645c~mv2.jpg/v1/fill/w_96,h_72,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/20230419_091235%5B1%5D.jpg)
Caleb Carr
MS student
.Caleb (center) came here Jan. 2022 from positions with the Peace Corps (Paraguay) and the U.S. Forest Service. He studied seedling recruitment and growth under different nutrient regimes following the historic 2021 freeze. He graduates Spring 2023 and has recently taken a job with the EPA.
Max Portmann
PhD student; former MS student
Max's research focuses on below ground root production of mangroves recovering from the catastrophic 2021 freeze. He will finish MS in 2023 and begin a PhD program.
Jessica Peterson
MS student
Jessica (standing by her mentor Dr. Donna Devlin)Â is studying the effects of fiddler crab burrowing on black mangrove propagule establishment and growth in a field experiment in the intertidal zone adjacent to campus.
Molly McGuigan
MS student
Molly's work involves quantifying mangrove litter decomposition and the invertebrates that colonize litter in a field experiment.
Phil Rivera
Undergraduate researcher
Phil has conducted an excellent field study of mangrove recovery after the freeze in two locations in Corpus Christi Bay. His was some of the first sites established after the big freeze and he has excellent data and analyses. His oral presentation in Spring 2022 won first place, even facing competition from some graduate students. He will be entering graduate school Fall 2023 at Villanova Univ. in the lab of Sam Chapman.
RECENT PUBLICATIONS (* STUDENT OR FORMER STUDENT)
NOXIOUS CYANOBACTERIA & SEAGRASS INTERACTIONS
Tiling, K.A.* and C.E. Proffitt. 2017. Effects of Lyngbya majuscula blooms on the seagrass Halodule wrightii and resident invertebrates. Harmful Algae. 62:104-112.
GENETIC CONNECTIVITY AND DIVERSITY OF RED MANGROVE POPULATIONS
Kennedy, J.P*., M. Pil, C.E. Proffitt, W. A. Boeger, A. M. Stanford and D. J. Devlin. 2016. Postglacial expansion of the red mangrove, Rhizophora mangle L., in the Caribbean Sea and Florida. American Journal of Botany. http: //www.amjbot.org/cgi/doi/10.3732/ajb.1500183 (on-line advance publication)
HURRICANE DAMAGE IN MANGROVESÂ MAGNIFIED BY NUTRIENT ENRICHMENT
Feller, I.C., E.M. Dangremond, D.J. Devlin, C.E. Lovelock, C.E. Proffitt, and W. Rodriguez. 2015. Nutrient enrichment intensifies hurricane damage and prolongs recovery in mangrove ecosystems in the Indian River Lagoon. Ecology 96: 2960-2972.
GENOTYPE & GENOTYPE X ENVIRONMENTÂ INTERACTIONS
Travis, S.E. and C.E. Proffitt. 2016. Genotypic interactions limit growth and stimulate flowering in a salt marsh foundation plant species. Perspectives in Plant Ecology, Evolution and Systematics 18:33-44.
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Mozdzer, T., J. Caplan, R. Hager, C.E. Proffitt, and L. Myerson. Accepted 6/13/2016, in press. Contrasting trait responses to latitudinal climate variation in two lineages of an invasive grass. Biological Invasions. DOI 10.1007/s10530-106-1218-y
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Proffitt, C.E. and S.E. Travis. 2010. Red Mangrove Seedling Survival, Growth, and Reproduction: Effects of Environment and Maternal Genotype. Estuaries and Coasts. 33(4):890-901.
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OYSTER POPULATIONS
Salewski, E.* and C.E. Proffitt. 2016. Separate and Combined Effects of Estuarine Stress Gradients and Disturbance on Oyster Population Development on Restored Reefs. Estuaries and Coasts 39: 510-528.
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Aqunio-Thomas, J.* and C.E. Proffitt. 2014. Oysters (Crassostrea virginica) on Red Mangrove (Rhizophora mangle) Prop Roots: Interactions among Foundation Species. Marine Ecology Progress Series 503: 177-194.
SOFT BOTTOM BENTHOS: MYTH OF INDICATOR SPRECIES
Zettler, M.L., C.E. Proffitt, P. Magni, G.V. Hoey, M. Frazier, A. Darr, H. Reiss, S. Degraer, G. Martin, D. Tagliapietra, T. Ysebaert, C. Greathead. 2013. On the myths of indicator species. PLoS ONE 8(10): e78219. doi:10.1371/journal.pone.0078219. (An Benthic Ecology Working Group of ICES publication)
SALT MARSH - MANGROVE REGIME SHIFTS
Guo, H., C. Weaver, S.Charles, A. Whitt, S. Dastidar, P. D'Odorico, J.D. Fuentes, J.S. Kominoski, A.R. Armitage, and S.C. Pennings. 2016. Coastal regime shifts: Rapid responses of coastal wetlands to changes in mangrove cover. Ecology 98: 762-772
MANGROVE COLD TOLERANCE AND COLONIZATION WITH GLOBAL WARMING
Coldren, G.A.* and C.E. Proffitt. 2017. Mangrove seedling freeze tolerance depends on salt marsh presence, species, salinity, and age. Hydrobiologia. 803:159-171. DOI 10.1007/s10750-017-3175-6.
LARGE SPATIAL AND LONG TEMPORAL SCALE ANALYSES USING STRUCTURAL EQUATION MODELING
Proffitt C.E. 2017 . Phytoplankton biomass in a Subtropical Estuary: Drivers, blooms, and ecological functions assessed over space and time using Structural Equation Modeling. Marine Ecology Progress Series. 569: 55-74.
SOIL CARBON: MANGROVES IN CHINA
Xiong, YanMei, B. Liao, E. Proffitt, W. Guan, X. Liu and Y. Sun. 2018. Patterns of soil carbon in mangroves are primarily controlled by soil properties: a landscape-scale study. Science of the Total Environment. 619-620:1226-1235.  DOI: 10.1016/j.scitotenv.2017.11.187.
HURRICANE RESEARCH FRAMEWORK
Hogan, J., R. Feagin, G. Starr, M. Ross, T. Lin, C. O’Connell, B. Stauffer, K. Robinson, M. Chapela, J. Xue, B. Reese, S. Geist, E. Whitman, S. Douglas, V. Congdon, J. Reustle, R. Smith, D. Lagomasino, B. Strickland, S. Wilson, C.E. Proffitt, J.D. Hogan, B. Branoff, A. Armitage, S. Rush. Accepted, in press. A research framework to investigate ecosystem responses to tropical cyclones. Bioscience 70: 477–489.
MANGROVE BOOK CHAPTER
Proffitt, C.E. and D.J. Devlin. 2023. Mangroves colonizing salt marshes. Chapter 18, In, Laguna Madre of Texas and Tamaulipas. K. Withers, W. Tunnel, J. Judd, and B. Chapman (eds.). Texas A&M Univ. Press.
HOFFMAN ET AL. PAPER
Hoffman*, S., D.J. Devlin, and C.E. Proffitt. 2022. Maternal nutrient history enhances black mangrove (Avicennia germinans) seedling growth after propagules experience a hard freeze. Estuaries and Coasts 45: 2534–2542
BARDOU ET AL. IN PRESSÂ (INCLUDING 4 PRESENT OR FORMER MEMBERS OF OUR LAB)
Rapidly changing range limits in a warming world: critical data limitations and knowledge gaps for advancing understanding of mangrove range dynamics in the southeastern United States. Estuaries and Coasts
SCIENCE ADVANCES PAPER ON HURRICANES. PATRICK ET AL. (INCLUDING 3 FROM OUR LAB).
A general pattern of trade-offs between ecosystem resistance and resilience to tropical cyclones. Science Advances
HOGAN ET AL. (INCLUDING MEMBERS OF OUR LAB). BIOSCIENCE. TROPICAL CYCLONE PAPER.
A Research Framework to Integrate Cross-Ecosystem Responses to Tropical Cyclones. Bioscience 70: 477–489.
TEACHING
About the Coastal Ecology & Genetics Lab
Texas State Aquarium: Animal Care and Operations
May 2020
This summer session course is designed to give undergraduate and masters students a broad introduction to the operations, animal care and wellness, water quality, health, and safety at a large aquarium. Class is team-taught on site at TSA (Texas State Aquarium), the fifth largest in the U.S. and the largest in Texas.
Marine Botany & Ecology of Marine Plants
May 2020
This is a "stacked" undergraduate and graduate course covering all aspects of marine plants. However, the greatest focus is on the study of intertidal higher plants and learning field techniques and how to design proper field experiments.
Biostatistics
May 2020
This course introduces undergraduate biology majors to the proper design and analysis of research projects. Also, how to read the biological literature and understand the statistical analyses presented therein. Students also learn the basics of conducting various statistical tests in R and graphing/presenting results.
Experimental Design & Analysis
May 2020
This is a graduate level class designed to provide students with some advanced training in a variety of statistical methodologies such as quantile regression, non-linear modeling, model selection and multi-model inference, path analysis, and structural equation modeling with latent variables. Students learn the basics of the analyses, and how to read scientific literature that uses them.
