Tuna’s Carbon Ratios Indicate Changes in Oceanic Food Web
The ratio of carbon isotopes in a trio of common tuna species has undergone drastic changes since 2000. The shift signals a change in the phytoplankton population, which is the base of the oceanic food web.
If phytoplankton are changing, the impacts will be felt throughout the rest of the food web, according to a research team including Nicolas Cassar, professor of biogeochemistry at Duke University’s Nicholas School of the Environment.
“The change we observed in tuna, which are near the top of the marine food web, reflects profound changes...
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