Oxygen concentrations in both the open ocean and coastal waters have declined by 2-5% since at least the middle of the 20th century.

The four crustacean amphipod species which were the subject of the study – Paraceradocus miersi,
Shraderia gracilis, Probulisca ovata and Prostebbingia brevicornis
[Credit: John Spicer]This is one of the most important changes occurring in an ocean becoming increasingly modified by human activities,…

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Source: archeo