Todd Lajeunesse

Professor of Biology

Todd Lajeunesse

Research Summary

Microbial Ecology and Evolution

Huck Graduate Students

Huck Affiliations


Publication Tags

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Anthozoa Coral Reefs Corals Coral Symbionts Symbiosis Ecology Symbiodinium Symbiont Reefs Dinoflagellida Miozoa Ribosomal Dna Coral Reef Sampling Reef Scleractinia Mutualism Endosymbionts Dinoflagellate Population Genetic Markers Ecosystem Genome Symbiodiniaceae

Most Recent Publications

Fiorella Prada, Silvia Franzellitti, Erik Caroselli, Itay Cohen, Mauro Marini, Alessandra Campanelli, Lorenzo Sana, Arianna Mancuso, Chiara Marchini, Alessia Puglisi, Marco Candela, Tali Mass, Franco Tassi, Todd C. LaJeunesse, Zvy Dubinsky, Giuseppe Falini, Stefano Goffredo, 2023, Communications Biology

Elise F. Keister, Shelby E. Gantt, Hannah G. Reich, Kira E. Turnham, Timothy G. Bateman, Todd C. LaJeunesse, Mark E. Warner, Dustin W. Kemp, 2023, Scientific Reports

Todd C. LaJeunesse, Pilar Casado-Amezúa, Benjamin C.C. Hume, Caleb C. Butler, Solenn Mordret, Roberta Piredda, Pasquale De Luca, Raimondo Pannone, Diana Sarno, Joerg Wiedenmann, Isabella D’Ambra, 2022, Symbiosis on p. 1-10

Bioprinted Living Coral Microenvironments Mimicking Coral-Algal Symbiosis

Daniel Wangpraseurt, Yazhi Sun, Shangting You, Sing Teng Chua, Samantha K. Noel, Helena F. Willard, David B. Berry, Alexander M. Clifford, Sydney Plummer, Yi Xiang, Henry H. Hwang, Jaap Kaandorp, Julia M. Diaz, Todd C. La Jeunesse, Mathieu Pernice, Silvia Vignolini, Martin Tresguerres, Shaochen Chen, 2022, Advanced Functional Materials

Todd C. LaJeunesse, Joerg Wiedenmann, Pilar Casado-Amezúa, Isabella D’Ambra, Kira E. Turnham, Matthew R. Nitschke, Clinton A. Oakley, Stefano Goffredo, Carlos A. Spano, Victor M. Cubillos, Simon K. Davy, David J. Suggett, 2022, British Phycological Journal on p. 166-180

Todd C. LaJeunesse, Anastazia T. Banaszak, Charles R. Fisher, J. Malcolm Shick, Mark E. Warner, James W. Porter, Armand M. Kuris, Roberto Iglesias-Prieto, William K. Fitt, 2021, Symbiosis on p. 393-400

Kira E. Turnham, Drew C. Wham, Eugenia Sampayo, Todd C. LaJeunesse, 2021, ISME Journal on p. 3271-3285

Kenneth D. Hoadley, Daniel T. Pettay, Allison Lewis, Drew Wham, Chris Grasso, Robin Smith, Dustin W. Kemp, Todd LaJeunesse, Mark E. Warner, 2021, Global Change Biology on p. 5295-5309

Solar Symbionts: Casting new light on the ancient partnership of reef-building corals and the micro-algae known as zooxanthellae, family Symbiodiniaceae

John Parkinson, Todd Lajeunesse, 2021,

Most-Cited Papers

Todd C. LaJeunesse, John Everett Parkinson, Paul W. Gabrielson, Hae Jin Jeong, James Davis Reimer, Christian R. Voolstra, Scott R. Santos, 2018, Current Biology on p. 2570-2580.e6

M. Aranda, Y. Li, Y. J. Liew, S. Baumgarten, O. Simakov, M. C. Wilson, J. Piel, H. Ashoor, S. Bougouffa, V. B. Bajic, T. Ryu, T. Ravasi, T. Bayer, G. Micklem, H. Kim, J. Bhak, T. C. LaJeunesse, C. R. Voolstra, 2016, Scientific Reports

Chatchanit Arif, Camille Daniels, Till Bayer, Eulalia Banguera-Hinestroza, Adrian Barbrook, Christopher J. Howe, Todd C. Lajeunesse, Christian R. Voolstra, 2014, Molecular Ecology on p. 4418-4433

Host-specialist lineages dominate the adaptive radiation of reef coral endosymbionts

Daniel J. Thornhill, Allison M. Lewis, Drew C. Wham, Todd C. Lajeunesse, 2014, Evolution; international journal of organic evolution on p. 352-367

Ecologically differentiated stress-tolerant endosymbionts in the dinoflagellate genus Symbiodinium (Dinophyceae) Clade D are different species

Todd C. Lajeunesse, Drew C. Wham, D. Tye Pettay, John Everett Parkinson, Shashank Keshavmurthy, Chaolun Allen Chen, 2014, Phycologia on p. 305-319

D. Tye Pettaya, Drew C. Whama, Robin T. Smith, Roberto Iglesias-Prietoc, Todd C. LaJeunessea, 2015, Proceedings of the National Academy of Sciences of the United States of America on p. 7513-7518

Benjamin C.C. Hume, Edward G. Smith, Maren Ziegler, Hugh J.M. Warrington, John A. Burt, Todd C. LaJeunesse, Joerg Wiedenmann, Christian R. Voolstra, 2019, Molecular Ecology Notes on p. 1063-1080

Iliana B. Baums, Andrew C. Baker, Sarah W. Davies, Andréa G. Grottoli, Carly D. Kenkel, Sheila A. Kitchen, Ilsa B. Kuffner, Todd C. LaJeunesse, Mikhail V. Matz, Margaret W. Miller, John E. Parkinson, Andrew A. Shantz, 2019, Ecological Applications

Blind to morphology: Genetics identifies several widespread ecologically common species and few endemics among Indo-Pacific cauliflower corals (Pocillopora, Scleractinia)

Jorge H. Pinzón, Eugenia Sampayo, Evelyn Cox, Leonard J. Chauka, Chaolun Allen Chen, Christian R. Voolstra, Todd C. Lajeunesse, 2013, Journal of Biogeography on p. 1595-1608

Maren Ziegler, Chatchanit Arif, John A. Burt, Sergey Dobretsov, Cornelia Roder, Todd C. LaJeunesse, Christian R. Voolstra, 2017, Journal of Biogeography on p. 674-686

News Articles Featuring Todd Lajeunesse

Indo-Pacific corals more resilient to climate change than Atlantic corals

In the face of global warming and other environmental changes, corals in the Atlantic Ocean have declined precipitously in recent years, while corals in the Pacific and Indian Oceans are faring better.

Professor of biology awarded Maskalick Biodiversity Seed Grant

Todd LaJeunesse, professor of biology at Penn State, was recently awarded the David G. Maskalick and Kathleen A. Maskalick Biodiversity Healthcare Seed Grant by the Eberly College of Science Office for Innovation.

Scientists resurrect 'forgotten' genus of algae living in marine animals

In the late 1800s, scientists were stumped by the “yellow cells” they were observing within the tissues of certain temperate marine animals, including sea anemones, corals, and jellyfish. Were these cells part of the animal or separate organisms? If separate, were they parasites, or did they confer a benefit to the host?

Widespread coral-algae symbioses endured historical climate changes

One of the most important and widespread reef-building corals, known as cauliflower coral, exhibits strong partnerships with certain species of symbiotic algae, and these relationships have persisted through periods of intense climate fluctuations over the last 1.5 million years, according to a new study led by researchers at Penn State.

Coral’s resilience to warming may depend on iron

How well corals respond to climate change could depend in part on the already scarce amount of iron available in their environment, according to a new study led by Penn State researchers.

Iron deficiency in corals?

When iron is limited, the tiny algae that live within coral cells — which can provide the majority of a coral’s nutritional needs — change how they take in other trace metals, which could have cascading effects on vital biological functions.

Biology graduate student receives three awards for outstanding presentation

Penn State biology graduate student Hannah Reich has been honored with three awards for a presentation she gave at three scientific conferences during summer 2019.

How to restore a coral reef

New guidelines drafted by a consortium of concerned experts could enable corals to adapt to changing environments and help restore declining coral populations in the Caribbean.

Bleached Corals Compensate For Stress By Eating More Plankton

In healthy corals, symbiotic algae housed within the coral photosynthesize during the day while the coral itself feeds on zooplankton, tiny shrimp and bug-like organisms, during the night.

Algae and Coral Have Been BFFs Since the Dinosaur Age

A new study shows that the relationship between coral polyps and zooxanthellae that produces colorful coral reefs began 160 million years ago.