Tethyan changes shaped aquatic diversification.

Area of Science:

• Paleoceanography and Biogeography
• Evolutionary Biology
• Marine and Freshwater Ecology

Background:

• The Tethys Ocean, existing from the Triassic to Pliocene, significantly shaped global species distribution.
• Its fragmentation into distinct biogeographic provinces influenced marine and freshwater fauna.
• Geological events like the Atlantic opening and Tethys closure are key to understanding aquatic diversification.

Purpose of the Study:

• To analyze how the Tethys Ocean's breakup influenced aquatic species distribution and diversification.
• To compare vicariance and dispersal processes in marine and freshwater environments.
• To reconstruct paleogeographic and geological changes affecting aquatic habitats.

Main Methods:

• Analysis of biogeographic and phylogenetic histories.
• Utilizing paleogeographic maps to illustrate geological changes (e.g., Atlantic opening, Tethys closure).
• Assessment of Cenozoic sea-level changes and freshwater habitat formation.

Main Results:

• Tethys fragmentation led to vicariant speciation in aquatic animals, correlating with tectonic events.
• The Atlantic opening isolated West and East Atlantic species; Tethys closure isolated Atlantic/Mediterranean and Indo-West Pacific.
• Isthmus of Panama formation isolated East Pacific and West Atlantic marine life; other events influenced population structure.

Conclusions:

• Tectonic events and geological changes associated with the Tethys Ocean's history drove aquatic speciation.
• New marine and freshwater habitats created by these changes fostered colonization and diversification.
• Further research is needed to fully understand the biological impacts of Tethyan changes.