The origin of the parrotfish species Scarus compressus in the Tropical Eastern Pacific: region-wide hybridization between ancient species pairs

David Carlon, D. R. Robertson, Robert Barron, David Anderson, Sonja Schwartz, Carlos Sanchez-Ortiz & John Choat
Background: An increasing number of hybrid zones with varying evolutionary outcomes have been documented from different reef fish families. In the Tropical Eastern Pacific (TEP), four species of parrotfishes occur in sympatry on rocky reefs from Baja California to Ecuador: Scarus. compressus,S. ghobban, S. perrico, and S. rubroviolaceus; and have complex phylogeographic histories. The most divergent,S. perrico, belongs to a Tropical American clade that diverged from a Central Indo-Pacific ancestor in the late Miocene (6.6...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?