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Competition within and between encrusting clonal invertebrates
1Depts of Biology and Geology and Geophysics, Yale University, New Haven, CT 06511, USA.
Trends in Ecology & Evolution
|January 15, 2011
Summary
Marine invertebrate colonies offer insights into competition. Encounters between genetically similar individuals lead to either fusion, involving cell parasitism, or rejection, resulting in overgrowth, thus defining selection units.
Area of Science:
- Marine biology
- Evolutionary biology
- Invertebrate zoology
Background:
- Encrusting marine invertebrate colonies serve as accessible models for studying inter-organismal competition.
- Competition outcomes, such as overgrowth, are readily observable in these colonial systems.
- Intraspecific competition studies reveal a genetically controlled recognition process dictating fusion or rejection between conspecifics.
Purpose of the Study:
- To investigate the cellular and colonial level competition dynamics in marine invertebrates.
- To elucidate the role of fusion-rejection genes in determining competitive outcomes.
- To understand how conspecific encounters shape the units of selection.
Main Methods:
- Observational studies on frequency and outcomes of overgrowth interactions in marine invertebrate colonies.
- Analysis of genetic control mechanisms governing fusion and rejection responses.
- Comparative data analysis from two established model systems.
Main Results:
- Fusion between conspecifics is linked to somatic cell parasitism.
- Rejection responses during conspecific encounters result in colony overgrowth.
- Fusion-rejection genes are identified as key regulators of competitive interactions and selection units.
Conclusions:
- Conspecific encounters in marine invertebrates present a critical choice between cellular-level competition (fusion) and colony-level competition (rejection).
- The fusion-rejection genetic system governs the fundamental units of selection in these organisms.
- Understanding these genetic mechanisms provides insights into the evolution of cooperation and conflict in clonal organisms.
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