New genetic evidence reveals the ancient origins and vast diversity of coral symbionts
In short: Researchers analyzing molecular, morphological, and ecological data have reorganized the classification of Symbiodiniaceae, the micro-algae that power coral reefs. The study found that what was once thought to be a single species is actually a diverse group of distinct genera, with an evolutionary history dating back to the middle of the Mesozoic Era.
By integrating various biological datasets, the researchers proposed that previously identified 'clades' are actually separate genera. They also used a molecular clock to show that these symbionts began diversifying roughly 160 million years ago, coinciding with the rise of reef-building corals. This revision provides a much-needed taxonomic framework for studying coral reef ecology.
Why it matters: Understanding the ancient diversity of these algae is key to understanding the evolution of coral reef ecosystems.
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Sources
- Source: Research: LaJeunesse et al. (2018). Systematic Revision of Symbiodiniaceae Highlights the Antiquity and Diversity of Coral Endosymbionts. Current biology : CB. · cc by-nc-nd
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