by Bull sharks linger on the beaches of Sydney every year, since the oceans warm, the researchers said on Friday and predict that one day they could stay all year round.
The predators are hiking and swimming north in winter when the long-term sea temperatures of Sydney under 19 degrees Celsius (66 degrees Fahrenheit) immerse themselves in the Balmier waters in front of Queensland.
A team of scientists dealt with the 15 years of acoustic persecution of 92 marked migration sharks in an area like Bondi Beach and Sydney Harbor.
Records show that the sharks spend an average of 15 days off Sydney’s coast in summer in summer, said Nicolas Lubitz, researcher at James Cook University, Nicolas Lubitz.
“If you stay longer, it means that people and prey have a longer overlap window with them.”
Hair attacks are rare in Australly loving Australia, and according to a national database, most heaviest bite come from three species: bull sharks, large white and tiger sharks.
Since 1791 there have been more than 1,200 shark incidents in Australia, of which over 250 led to death.
The researchers found an average warming of 0.57 ° C in Bondi for the October May period between 2006 and 2024, said the journal science of the overall environment examined by experts.
Over a longer period of time, the temperatures of the surface of the sea in the area rose from average between 1982 and 2024 on average 0.67 ° C.
– Bull Sharks ‘all year round’ – –
“If this trend continues to exist, which it likes to be, this only means that these animals will spend more and more time for their seasonal sales boundary, which is currently south and central New South Wales,” said Lubitz.
“So it could be that in a few decades, bull sharks may be present in waters in front of Sydney all year round,” he added.
“While the opportunities of a shark bites and shark in Australia generally remain low, this only means that people have to become aware of an increased window of the Bullenhai presence in coastal waters before Sydney.”
Climate change could also change the breeding patterns, said Lubitz, whereby early evidence indicates that youth sharks appeared further south in the rivers.
There was also some evidence that summer habitats for large white, the colder waters prefer to take on North -New South Wales and Queensland, he said.
Tagged Sharks trigger an alarm if you swim within the scope of a network of recipients that have passed on parts of the Australian coast and give people real -time warnings in a mobile app of their presence at important locations.
DJW/HMN
