Coral Reefs

Podcast: Sharks – Masters of the Ocean

Podcast: Sharks – Masters of the Ocean

Episode 7: Sharks- Masters of the Ocean.

Today we know of at least 1,200 species of shark, and we’re still finding more. Sharks are a critical part of life in the ocean. But the numbers don’t lie, these magnificent animals are seriously threatened. Since 1970, the global abundance of oceanic sharks and rays has declined by 71%.

In this episode of Ocean Matters, Helen Czerski explores how these masters of the ocean sense their world, why they’re not the “lone hunters” depicted by Hollywood, and why we need to protect them.

With special thanks Sarah Fowler from Save Our Seas Foundation, Dr David Jacoby from the Zoological Society of London, and Dr Al Dove from Georgia Aquarium.

Come with us on this scientific adventure. Follow and subscribe now, wherever you get your podcasts, so that you never miss an episode.

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Coral Reefs

Podcast: The Deep Sea – Exploring the Unknown

Ocean Matters - New Episode Available Now

Episode 5: The Deep Sea – Exploring the Unknown

When we look up at the night sky, we can see the cosmos in all its glory; the constellations are familiar friends that we learn as children.  But even though the deep ocean is far closer, it is far more mysterious. Whilst it is hard to get to, it certainly isn’t empty or featureless.

In Ocean Matters, join oceanographer and physicist Helen Czerski as she explores the deep sea: what’s in it, why it matters, and how the top of the ocean is inextricably connected to the bottom.

With special thanks to Professor Kerry Howell from the University of Plymouth, Dr Sylvia Earle, and Professor Alex Rogers from REV Ocean.

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Sentinel Species Research

Restoring Seabird Islands

Restoring Seabird Islands

By Peter Carr, ZSL

Peter Carr

New research published this week in Restoration Ecology, led by scientists at ZSL’s Institute of Zoology, shows the potential benefits to breeding seabirds of converting coconut plantations to native habitats after invasive predators have been eradicated.

Red-footed Booby © Peter Carr, ZSL

Red-footed Booby © Peter Carr, ZSL

On many Pacific and Indian Ocean islands, colonisation by humans brought invasive species, the destruction of native habitats, and widespread growth of coconut plantations, leading to the decimation of seabird populations. The coconut industry on oceanic islands has since crashed, leaving the legacy of abandoned coconut plantations that, by themselves, create species-poor biomes. When an island’s flora is dominated by abandoned coconut plantations and it has invasive rats, it becomes an avian desert.

Experts from the Institute of Zoology, Zoological Society of London, along with colleagues from the Royal Botanic Gardens, Kew, the University of Exeter, and Heriot-Watt University, have been researching the possible outcomes for breeding seabirds (e.g., Red-footed Booby and Lesser Noddy) of eradicating rats from oceanic islands, with and without conversion of surrounding abandoned coconut plantations.

Lesser Noddy © Peter Carr, ZSL

Lesser Noddy © Peter Carr, ZSL

Working for over a decade, collecting data in the Chagos Archipelago, central Indian Ocean, scientists counted every breeding seabird on all 55 islands of the archipelago, and mapped and recorded the habitat they were breeding in. By comparing the number of seabirds breeding in a specific habitat on rat-free islands, they were able to predict the number of seabirds that could potentially colonise an island if invasive rats were eradicated, and abandoned coconut plantations were converted to native habitats. This is especially relevant in the Chagos Archipelago, as some 94% of the terrestrial landmass is rat-infested, where the vegetation is dominated by abandoned plantations.

One island, Ile du Coin in Peros Banhos atoll which, at 1.26km squared, is the fourth largest in the Chagos Archipelago, was hypothetically ecologically restored. This island has rats, and 92% of its vegetation is made up of former coconut plantation. At present, there are 51 pairs of breeding seabirds on this island, made up of three generalist species (Brown and Lesser Noddy and Common White Tern). Scientists predict that, following rat eradication, without any habitat management, the number of breeding pairs could rise to 4,306 pairs of 14 species. However if 1 km squared of abandoned plantation is converted to equal measures of native savannah and forest (example shown below), the number of breeding pairs could potentially increase to 319,762 of 16 species – more than the entire archipelago at present.

Native seabird breeding habitat, Chagos Archipelago © Peter Carr, ZSL

Native seabird breeding habitat, Chagos Archipelago © Peter Carr, ZSL

This research has practical applications throughout the Tropics. It shows that in order to restore tropical oceanic seabird islands that have been ecologically degraded, due to introduced predators and the destruction of native habitat, eradicating the predator as a single intervention method is unlikely to result in fully functional, seabird-driven ecosystems. On degraded islands where invasive rats and abandoned coconut plantations exist together, to restore seabird-driven ecosystems, rats must be eradicated, but also the plantations must be converted to native habitat.

In the Chagos Archipelago, as elsewhere in the Tropics, restoring seabird islands is no longer a ‘green dream’, it is a matter of funding and political goodwill. This research shows the requirement for an ecosystem-wide approach in order to fulfil these green dreams, and demonstrates the potential colossal gains to the family of birds that are suffering the greatest decline in number – seabirds.

You can access the paper here, and find out more about our work in the Chagos Archipelago here.

Improving MPA Management

Expanding Marine Protected Areas Could Make a Huge Difference to the Health of the Oceans

Expanding Marine Protected Areas Could Make a Huge Difference to the Health of the Oceans

“Action is the antidote to despair,” says international expert and advocate for marine protection

Callum Roberts is Professor of Marine Conservation in the Centre for Ecology and Conservation at the University of Exeter. He recently chaired the Bertarelli Foundation’s marine science seminar, The Role of Science for Marine Protected Areas. Here, he describes his work with Marine Protected Areas (MPAs) and how they are a rising force for hope in ocean conservation.

 

You and your team designed a network of MPAs in the North Atlantic that were established in 2010. What did you consider when you were developing the design?

Our research underpinned the creation of four huge MPAs in the North Atlantic, covering half a million square kilometres – the first network of MPAs to be established in the international waters of the high seas.

In recommending sites for protection, we were particularly keen to ensure that the richest and most vulnerable ecosystems were included, and that the network represented the range of biodiversity found in open ocean and the seabed habitats of the region.

Some MPAs, like the ones your team designed, have been in existance for several years now. What benefits have they brought to marine life?

Most of the area covered by these MPAs is protected from fishing and hunting – activities which have had the most significant impacts on the region to date – so this is a big win for conservation.

But other threats remain, like deep sea mining. The International Seabed Authority does not consider these protected areas to be off limits to mining and has already licensed exploration around seamounts (underwater mountains) and hydrothermal vents in other parts of the mid-Atlantic.

What are the benefits of expanding MPAs?

For the last 16 years, the international community has pursued a target of protecting 10% of the ocean by 2020. Unfortunately, not enough of this space has been given enough protection to make a real difference to the marine life living there.

We know that species and habitats rebound quickly and thrive given high levels of protection from extractive use. The ‘light’ protection afforded to most MPAs is not enough to deliver such recoveries. If we match efforts to expand protected areas with increases in protection level, we could make a huge difference to the health of the ocean.

How realistic is it to meet the ‘30by30’ commitment to protect 30% of the ocean by 2030?

 Momentum has really picked up in the creation of marine protected areas and the coverage curve is bending upwards as efforts accelerate. If we keep up these efforts, there is every reason to think that 30% MPA coverage is achievable by 2030. Some countries are there already, like the Seychelles, Palau, Chile and the UK, with many more having committed to reach the target.

What are the main barriers to overcome to reach this target?

It would make a huge difference if 30by30 were to become the official policy of the Convention on Biological Diversity at its Conference of Parties next year. There are political differences to overcome first, and lower income countries, where much of the richest biodiversity is located, will need cast iron commitments of financial help from richer nations to convince them to back the target.

What gives you cause to be an ‘ocean optimist’?

Most of the great whales are making huge strides towards recovery since the global whaling moratorium in 1984. Losses of mangrove forests have slowed to a trickle in many countries as their natural values – coastal protection, support for fisheries and carbon capture and storage – are better appreciated.  Creating national networks of MPAs has been standard government policy almost everywhere since the 2002 World Summit on Sustainable Development.

I think that pessimism is a significant obstacle to progress because the hopelessness it engenders can become self-fulfilling. Action is the antidote to despair!

Improving MPA Management

Local Heros and Global Collaboration can Protect Threatened Oceans

Local Heros and Global Collaboration can Protect Threatened Oceans

It’s time we became more inclusive for the sake of our the oceans,” says marine conservation pioneer 

Dr. Asha de Vos is the founder and Executive Director of Oceanswell. She recently chaired the Bertarelli Marine Science Programme seminar, Ocean Optimism: Solutions for a Threatened Ocean. Here, she describes how her work ties into that topic.  

Could you explain why you founded Oceanswell and what the organisation does? 

Oceanswell is the first marine conservation research and education organisation in Sri Lanka. The fact that it was only established in 2017 should tell you a lot about my island home’s conservation priorities. The unfortunate truth is that in places like Sri Lanka, the ocean has long been seen as a space for extraction rather than a place needing protection.  

To save our oceans, every coastline needs a local hero. Oceanswell aims to nurture this next generation of diverse ocean heroes. We do this by equipping individuals from under-represented nations to conduct marine conservation research. 

What do you think is the greatest barrier to effective marine conservation? 

Colonial or ‘parachute’ science is when researchers from the developed world come to countries like mine and do work that is driven by their own assumptions, motives, and personal needs – often without investing in the country’s people or its infrastructure. This is problematic because it cripples local conservation efforts and creates a dependency on external expertise. Essentially this model is not sustainable.  

The most important and meaningful collaborations for me have been those with researchers who acknowledged that working outside their home space is a privilege, not a right. A handful of people from the global North cannot save our oceans, it will take an army of people from around the world. It’s time we became more inclusive for the sake of our oceans.  

Why is the seminar topic of ‘Solutions for a Threatened Ocean’ so important? 

Most of the news we hear about our planet is shrouded in doom and gloom. Our systems are collapsing, our species are going extinct and at the core of it all, we are spelling sowing the seeds of our own demise. It focusses on how we have failed, and how we continue to fail. 

This messaging is incredibly destructive. If we give people nothing to hope for, then we cannot expect them to join us in our efforts to drive change. There is plenty to give us optimism. And the more we bring these conversations to the fore, the more people will grow in hope and potentially even join in and contribute! 

Where have you seen the most progress in tackling threats to the oceans? 

One thing that has started to change is the sharing of knowledge around our oceans. For too long, the academic narrative has dominated. Little of the work and the wonder of it was accessible to the general public. This means that people often saw the ocean as an infinite space of extraction and dumping rather than as part of their own home. A shift in narrative is important if we are to protect our oceans.  

The other obvious area of progress is in the use of technology and innovation. A space to watch is the development of cost-effective tools that can go where humans cannot and can bring back data to help scientists guide decision-makers do what is necessary and right. 

What gives you cause to be an ‘ocean optimist’?  

My name, Asha, means ‘Hope’ in Sanskrit. So, I guess I was born with a lot of hope in my heart. But jokes aside, in my lifetime I have seen changes that give me a reason to stay optimistic.  

When I was growing up and I would tell Sri Lankans that I wanted to be a marine biologist, most responded by saying that there was no scope for such a career in our country. Many questioned the sense of embarking on a degree that would be – in their view – useless. Today, there are more Sri Lankan students than ever before wanting to work in the field and doing degrees in marine biology. If that doesn’t make one optimistic, I don’t know what will.