Using mercury and stable isotopes of carbon and nitrogen to obtain such information, the team were able to also analyse how the ice cover and the impact of potential toxic compounds have evolved over time.
Their findings were published in the Current Biology journal.
The tusks of the ten narwhals involved in the research were 150 to 248 cm long, and contained data from the time period 1962 to 2010.
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The popular dive spot is southeast of the Philippine capital, Manila.
BBC Philippine correspondent Howard Johnson joined dive professionals from Anilao Scuba Dive Centre as they resumed diving, following the national lockdown. The dive centre is affiliated to the United Nations Environment Programme’s Green Fins, which promotes sustainable marine tourism in South-East Asia.
The North American-based, not-for-profit professional honour society advised that the grant was made possible, thanks to a US$5,000 donation from the Netherlands fashion brand 'Scotch & Soda'.
Scotch & Soda states "we give the same love and attention to the sustainable production of our garments, as we do to their design."
We strive to make issues surrounding the environment, animal welfare and safe working conditions a priority. Scotch & Soda
