Professor of Biology
Microbial Ecology and Evolution
Huck Graduate Students
Publication TagsCoral Reefs Ecology Symbiodinium Coral Anthozoa Corals Symbiont Symbionts Miozoa Dinoflagellate Symbiosis Population Genetics Dinoflagellida Coral Reef Reefs Endosymbionts Scleractinia Ecosystem Genotype Endosymbiont Reef New Species History Adaptive Radiation Genome
Most Recent Papers
Robert Kent Trench (1940–2021): a life devoted to symbiotic mutualisms and seeking nature’s truth.
Todd Lajeunesse, 2022, Symbiosis on p. 393–400
Revival of Philozoon Geddes for host-specialized dinoflagellates, ‘zooxanthellae’, in animals from coastal temperate zones of northern and southern hemispheres
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
Robert Kent Trench (1940–2021)
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
Mutualistic microalgae co-diversify with reef corals that acquire symbionts during egg development
Kira E. Turnham, Drew C. Wham, Eugenia Sampayo, Todd C. LaJeunesse, 2021, ISME Journal on p. 3271-3285
Different functional traits among closely related algal symbionts dictate stress endurance for vital Indo-Pacific reef-building corals
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,
Stress endurance among critical Indo-Pacific reef building corals is influenced by the unique physiology of their recently evolved photobionts.
Kenneth Hoadley, Todd Lajeunesse, 2021, Global Change Biology on p. 5295–5309
Miliolidium n. gen, a New Symbiodiniacean Genus Whose Members Associate with Soritid Foraminifera or Are Free-Living
Xavier Pochon, Todd C. LaJeunesse, 2021, Journal of Protozoology
Philozoon: a new dinoflagellate genus of host–specialized endosymbionts found in Cnidaria from coastal temperate zones in northern and southern hemispheres.
Todd LaJeunesse, 2021, European Journal of Phycology
Bringing the ecology and evolution of coral-dinoflagellate symbioses into high resolution
Todd Lajeunesse, 2021,
Systematic Revision of Symbiodiniaceae Highlights the Antiquity and Diversity of Coral Endosymbionts
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
Genomes of coral dinoflagellate symbionts highlight evolutionary adaptations conducive to a symbiotic lifestyle
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
Assessing Symbiodinium diversity in scleractinian corals via next-generation sequencing-based genotyping of the ITS2 rDNA region
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
A genetics-based description of Symbiodinium minutum sp. nov. and S. psygmophilum sp. nov. (dinophyceae), two dinoflagellates symbiotic with cnidaria
Todd C. Lajeunesse, John E. Parkinson, James D. Reimer, 2012, Journal of Phycology on p. 1380-1391
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
Microbial invasion of the Caribbean by an Indo-Pacific coral zooxanthella
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
Blind to morphology
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
Biogeography and molecular diversity of coral symbionts in the genus Symbiodinium around the Arabian Peninsula
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
New insights into the dynamics between reef corals and their associated dinoflagellate endosymbionts from population genetic studies
Iliana B. Baums, Meghann K. Devlin-Durante, Todd C. Lajeunesse, 2014, Molecular Ecology on p. 4203-4215
News Articles Featuring Todd Lajeunesse
Jul 01, 2021
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?
May 24, 2021
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.
Sep 30, 2020
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.
Apr 22, 2020
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.
Aug 20, 2019
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.
Jul 23, 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.
Jun 30, 2019
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.
Aug 13, 2018
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.
Aug 10, 2018
Coral reefs 'weathered dinosaur extinction'
Corals may have teamed up with the microscopic algae which live inside them as much as 160 million years ago, according to new research.