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Australian scientists hailed what they described as a world-first discovery of two shark species interbreeding Tuesday, a never-before-seen phenomenon which could help them cope with warmer oceans.
Lead researcher Jess Morgan said the mating of the local Australian black-tip shark with its global counterpart, the common black-tip, was an unprecedented discovery with implications for the entire shark world.
“It’s very surprising because no one’s ever seen shark hybrids before, this is not a common occurrence by any stretch of the imagination,” Morgan, from the University of Queensland, told AFP.
“This is evolution in action.”
The Australian black-tip is slightly smaller than its common cousin and can only live in tropical waters, but its hybrid offspring have been found 2,000 kilometres down the coast, meaning it could be adapting to ocean temperatures.
“If it hybridises with the common species it can effectively shift its range further south into cooler waters, so the effect of this hybridising is a range expansion,” Morgan said.
“We thought we understood how species of sharks have separated, but what this is telling us is that in reality we probably don’t fully understand the mechanisms that keep species of shark separate,” he said.
“And in fact this may be happening in more species than these two.”
Originally posted by daaskapital
Now, can you imagine a great white x Tiger shark?
Originally posted by daaskapital
Now, can you imagine a great white x Tiger shark?
Australian scientists hailed what they described as a world-first discovery of two shark species interbreeding Tuesday, a never-before-seen phenomenon which could help them cope with warmer oceans.
The discovery was made during cataloguing work off Australia’s east coast when Morgan said genetic findings showed certain sharks to be one species when physically they looked to be another.
Originally posted by ignant
Interesting. But they're both Black Tips,
what species or subspecies?
Genetic analyses have revealed substantial variation within this species, with populations from the western Atlantic Ocean isolated and distinct from those in the rest of its range. Blacktip shark
females are also capable of asexual reproduction.
Appearance-wise this species is virtually identical to the common blacktip shark (C. limbatus), from which it can be reliably distinguished only by its lower vertebra number and by genetic markers.Aus. Blacktip
“We thought we understood how species of sharks have separated, but what this is telling us is that in reality we probably don’t fully understand the mechanisms that keep species of shark separate,” he said.
“And in fact this may be happening in more species than these two.”
have found that that the Australian and common blacktip sharks form a closely related clade with the graceful shark (C. amblyrhynchoides) and the smoothtooth blacktip shark (C. leiodon).[6][7][8] The interrelationships between them have not been fully resolved, but available data suggest that C. tilstoni and C. limbatus are not the most closely related species within the clade despite their similarity.