"It's enabled a species restricted to the tropics to move into temperate waters."
Climate change and human fishing are some of the potential triggers being investigated by the team, with further genetic mapping also planned to examine whether it was an ancient process just discovered or a more recent phenomenon.
If the hybrid was found to be stronger than its parent species - a literal survival of the fittest -Simpfendorfer said it may eventually outlast its so-called pure-bred predecessors.
The hybrids were abundant, accounting for up to 20 percent of black-tip populations in some areas, but Morgan said that didn't appear to be at the expense of their single-breed parents, adding to the mystery.
Simpfendorfer said the study could challenge traditional ideas of how sharks had and were continuing to evolve.
Questions:
1. What species of sharks were the hybrids a combination of?
2. How was the discovery made?
3. What percentage of the black-tip population were hybrids?
Answers:
1. Australian black-tip shark and common black-tip.
2. During cataloguing work.
3. Up to 20 percent.
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