In 2006, when I first heard about ocean acidification, I started running expeditions near underwater volcanoes in the Mediterranean where CO2 bubbles up through the sea floor, acidifying large areas for centuries. We have found similar ecosystem shifts at all the seeps, so I am now convinced that ocean acidification will bring change. In a recent article I attempt to put this topic into context, focusing on two major causes of change – the corrosive effects of CO2, and the way the extra carbon is used as a resource.
Here’s what we’ve noticed about the sea life around those natural CO2 seeps in the Mediterranean: algae seems to thrive, whereas animals with calcium carbonate shells—like plankton—dissolve away. We see a lot of brown seaweeds on the seafloor, and they often overwhelm slower-growing competitors like corals. Although life is abundant at CO2 seeps, there is far less diversity than we see elsewhere.
This was our top tweet of the week and it’s no wonder why–finding out that over one third of a given sample of fish have plastic in their bellies is downright creepy. This study by Plymouth University and the UK Marine Biological Association illustrates the tangible effects that trash has on our ocean. If you’re looking for ways to lessen your impact and to keep the ocean healthy, try downloading our mobile app, Rippl. You’ll get weekly ocean-friendly tips and be able to track your progress!
Not only is this a problem for those that eat the fish, such as humans, but the research team believe that the accumulation of plastic in fish could block the animals’ digestive systems and even cause fish to stop eating.
In a statement, Richard Thompson from Plymouth University said: “We don’t need to have plastic debris in the sea. These materials are inherently very recyclable, but regrettably they’ve been at the heart of our throw-away culture for the last few decades. We need to recognise the value of plastics at the end of their lives and need help from industry and manufacturers to widen the potential for every day products to be reusable and recyclable.”