Metamorphosis: A multi-kingdom approach
Andreas Heyland, Jason Hodin, Cory Bishop, and Leonid Moroz
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This symposium is sponsored by the Whitney Laboratory for Marine Bioscience, the University of Florida, SICB and the American Microscopic Society |
Links:
NEW! Open access table of contents, with free PDFs of all symposium papers
Press Release (.pdf)
Symposium questionnaire and discussion thread on SICB bulletin board
Contributed talks and posters associated with the symposium
Overview:
The study of life history evolution in general and metamorphosis in particular embodies disparate approaches, theory, methodology and taxonomic choice. With this symposium, we aim to create a platform of presentation and discussion that is conducive to forging a unification of this topic, and in due course, to create new directions of inquiry. Specifically, this symposium will integrate ecological, developmental, physiological and evolutionary perspectives on metamorphosis and analyze the signaling architecture of this life history transition across kingdoms.
Although the term metamorphosis generally invokes life history transitions in animal phyla, we propose to broaden the concept to include comparable life history transitions in fungi and multicellular algae, and we have invited key researchers working on these groups in order to gain their perspective. This broad taxonomic approach will allow identification of instances of co option and parallel evolution of traits related to a metamorphic life history, thus expanding our knowledge of how natural selection acts on life history strategies in general.
Research on model organisms provides the bulk of the data for comparisons of developmental signaling pathways among distantly related organisms, but necessarily fails to be informative about evolutionary causation, primarily due to limited taxonomic sampling within widely divergent taxa (for review see 1). The apparent consequence has been a systematic bias in the interpretation of developmental character evolution toward homology. The need for a strict comparative methodology will only increase as model systems inexorably generate new data on developmental signaling pathways. Thus, in order to provide a broader context in which to interpret shared ontogenetic patterns, and in particular to assess the frequency of homoplasy in the evolution of development, it is necessary to consult a wider variety of organisms, and importantly, their attendant life history traits. In this context, evolutionary comparisons within more restricted taxonomic groupings are indispensable for uncovering the mechanistic underpinnings of evolutionary change.
The evolutionary patterns and consequences of gain and loss of metamorphosis in chordates, arthropods and a variety of marine invertebrates has been the subject of much debate (e.g. 2-5). Because such radical alterations in organsimal life histories correlate with profound changes in developmental patterns, an understanding of the overall mechanics of life history evolution will inform ongoing interpretations of evolution of ontogenetic mechanisms. Furthermore, the fact that the evolutionary loss of a metamorphic life history has been hypothesized to have occurred repeatedly within numerous animal phyla underscores the importance of a comparative approach to understanding the evolution of metamorphosis. That EvoDevo researchers are increasingly recognizing the power of such comparative approaches makes this symposium all the more timely.
Organization of symposium
The symposium “Metamorphosis: A multi-kingdom approach” is a society-wide symposium including one discussion periods as well as a contributed paper (talk) and poster session. We ask all participants (both presenters and non-presenters) to provide a provisional definition of metamorphosis (see questionnaire), and this will form part of the basis for one of our discussions. We encourage speakers to bring students and post-docs from their labs to present additional material in form of posters. This will give more room for informal discussion outside the rather compressed time-line of the symposium (30 minute talks for each speaker plus one 30 minute discussion period).
SATURDAY, JAN. 7
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Time |
Title |
Name |
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7.50-8.00 |
Introduction |
Andreas Heyland University of Florida,Whitney Laboratory, St. Augustine, FL (USA) |
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8:00-8:30 |
Metamorphosis: is it under stimulatory or inhibitory control?
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Cory Bishop, Jan Pechenik and Mike Hadfield Kewalo Marine Laboratory, University of Hawai’i ,Honolulu, HI (USA) and Tufts University, Boston, MA (USA) |
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8:30-9:00 |
The origin of the metazoan biphasic life cycle: new insights from an ancient phylum |
Sandie Degnan and Bernie Degnan University of Queensland (AUSTRALIA) |
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9:00-9.30 |
Duke University, Durham, NC (USA) |
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9:30-10:00 |
Sclerotial morphogenesis in fungi is induced by oxidative stress |
Christos Georgiou |
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10:00-10:30 |
Coffee Break |
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10:30-11:00 |
Applying the concept of metamorphosis to the crustose-to-erect thallus transition of macroalgae |
Bernab� Santelices and J.L. Alvorado Facultad de Ciencias Biol�gicas |
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11:00-11:30 |
Expanding Networks: A hypothesis for the evolution of metamorphosis |
Jason Hodin Hopkins Marine Station, Pacific Grove, CA (USA) |
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11:30-12:00 |
DISCUSSION |
What is metamorphosis? Is it animal-specific or not? |
SUNDAY, JAN 8
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8:00-8:30 |
Andreas Heyland and Leonid L. Moroz University of Florida, Whitney Laboratory, St. Augustine, FL (USA) |
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8:30-9:00 |
Signals mediating rapid loss of cell adhesion in metamorphosis |
Anthony Pires Dickinson College, PO Box 1773, Carlisle, PA 17013 |
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9:00-9:30 |
Delay of metamorphosis in solitary ascidians: Genetics, morphology, and ecology |
Molly Jacobs Friday Harbor Laboratories; University of Washington, WA (USA) |
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9:30-10:00 |
Hormones translate environmental information to time amphibian metamorphosis |
Robert Denver and Erica Crespi University of Michigan, Ann Harbor, MI (USA) |
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10:00-10:30 |
coffee break |
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10:30-11:00 |
Lamprey metamorphosis and a theory on the evolution of adult life history types |
John Youson University of Toronto, Toronto, ON (CANADA) |
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11:00-11:30 |
Juvenile hormone as an effector of metamorphosis and life history transitions |
Thomas Flatt, Brown University, Providence, RI (USA) |
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11:30-12:00 |
Deniz F. Erezyilmaz, Lynn M. Riddiford and James W. Truman. University of Washington, Seattle, WA (USA) |
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Contributed talks and posters associated with the symposium
TALKS: Saturday, January 7 – Great West Hall
| TIME | PRESENTATION NUMBER | AUTHOR(S) | TITLE |
| 13:00 | 65.1 | Adam M. Reitzel; Sullivan, J.C.; Finnerty, J.R. | Metamorphosis in the Life history of a parasitic sea anemone, Edwardsiella lineata |
| 13:20 | 65.2 | Edwards, T.M.; Moore, B.C.; Guillette, L.J. | Metamorphic sex change: Evolutionary insight for endocrine disruption studies |
| 13:40 | 65.3 | Miller, MF; Okada, R; Ito, Y; De Groef, B; Yamamoto, K; Denver, RJ; Kikuyama, S | Involvement of the corticotropin-releasing factor (CRF) type 2 receptor in CRF-induced thyrotropin release from the tadpole pituitary |
| 14:00 | 65.4 | Krista A. Mccoy; Alison M. Amick | Metamorphosis and reproductive growth and development |
| 14:20 | 65.5 | Erica J Crespi; Robert J. Denver | Conserved and novel functions of leptin in the South African clawed frog (Xenopus laevis) |
| 14:40 | 65.6 | Michael E. Baker | Role of the environment on the evolution of signal transduction proteins and metamorphosis |
POSTERS: Saturday, January 7 – 3:00-5:00pm Exhibit Hall (poster session P3)
Selected References:
1. Heyland, A., Hodin, J., and Reitzel, A. M. (2005). Hormone signaling in evolution and development: a non-model system approach. Bioessays 27, 64-75.
2. Elinson RP. Direct Development: an Alternative Way to Make a Frog. Genesis 2001;29(2):91-95.
3. Truman JW, Riddiford LM. The origins of insect metamorphosis. Nature 1999;401(6752):447-52.
4. Hadfield MG, Strathmann MF. Variability, flexibility and plasticity in life histories of marine invertebrates. Oceanologica Acta 1996;19(3-4):323-334.
5. Youson JH. The Impact of Environmental and Hormonal Cues on the Evolution of Fish Metamorphosis. In: Hall BK, Pearson RD, M�ller GB, editors. Environment, Development, and Evolution : Toward a Synthesis. Cambridge, London: MIT Press; 2003. p 239-277.
