Hi! I’m Douglas Baltes. I love the ocean. I studied it for five years and got a Marine Biology degree from the University of Tasmania. My favorite place is the giant kelp forests of the Great Southern Reef. These underwater forests are so fun, but they’re in trouble. Let’s learn why they’re cool, why they’re going away, and how we can save them. Ready for a sea adventure?
What Are Giant Kelp Forests?
The giant kelp forests of the Great Southern Reef are like underwater jungles. They grow on a big reef that goes 8,000 kilometers along Australia’s south coast. This reef is huge, spans over 8,000 km of Australia’s southern coastline, from Kalbarri (WA) to northern NSW. Giant kelp is a seaweed called Macrocystis pyrifera. It grows super tall—up to 35 meters! That’s as tall as a big building. It grows fast, like half a meter a day.
These forests are homes for many animals. Fish, crabs, lobsters, and tiny penguins live here. The kelp’s long leaves wave in the water. They make safe spots for animals to hide. The Great Southern Reef has lots of special animals and plants. About 70–80% of them live only here! I’m a marine biologist, and I’ve seen how these forests help so many creatures.
Kelp forests help the Earth too. They take in carbon dioxide. This stops climate change. They make oxygen, like trees do. These forests keep the ocean healthy and fun.
Why Are Kelp Forests Cool?
Giant kelp forests do big things. They give homes to animals like sea lions and fairy penguins. Fairy penguins are the smallest penguins ever. These animals eat and hide in kelp. Lobsters and abalone, which people catch for food, need kelp too. These fisheries make lots of money for Australia—four times more than the Great Barrier Reef’s fisheries!
Kelp forests keep beaches safe. Their thick leaves slow down waves. This stops beaches from washing away. They make water calm so baby fish can grow. They also clean water by taking in extra nutrients. Too many nutrients can make bad algae grow. I work with the Australian Marine Conservation Society to learn why these forests are so important.
People love kelp forests. Divers swim in them. Fishers need them for jobs. Scientists like me study them to learn about the sea. The Great Southern Reef isn’t as famous as the Great Barrier Reef, but it’s super cool. I want to tell everyone why we need to save it.
How Do Kelp Forests Work?
Let’s see how kelp forests live. Kelp is a brown seaweed. It grows on rocky reefs. It doesn’t have roots like plants on land. It has a “holdfast” that sticks to rocks so it stays put. Its long stems, called stipes, reach up to the sun. At the top, leaves catch sunlight to grow, like tree leaves.
Kelp forests are like a tall house for sea animals. The top part gives shade. The middle and bottom parts are hiding spots for fish and crabs. Weedy sea dragons look like floating seaweed. They hide in kelp to stay safe. My studies at the University of Tasmania show how kelp makes these fun homes.
Kelp needs cool water with food, called nutrients. Nutrients help kelp grow big and strong. The Great Southern Reef’s cool water in Tasmania is great for kelp. But the ocean is changing. This hurts the forests. Let’s find out why.
Why Are Kelp Forests Going Away?
The giant kelp forests of the Great Southern Reef are disappearing. In Tasmania, 95% of kelp forests are gone since the 1940s. That’s almost all of them! A few things are causing this. Let’s look at them.
Warmer Water
The ocean is getting warmer. This is because of climate change. In Tasmania, the water is warming four times faster than other places. Giant kelp likes cool water between 5–20°C. Warm water makes kelp weak. It can die. A warm current, called the East Australian Current, brings hot water to Tasmania. Kelp doesn’t like that.
I’ve studied how warm water hurts kelp. In hot summers, kelp gets tired. It can’t grow well. It’s like when you’re too hot and feel sleepy. This makes it easy for diseases to hurt kelp.
Sea Urchins
Sea urchins are a big problem. These spiky animals eat kelp like it’s candy. In Tasmania and Victoria, long-spined sea urchins eat so much kelp. This turns forests into “urchin barrens.” These are empty spots with no kelp, just rocks and urchins. In Victoria’s Port Phillip Bay, 60% of reefs are eaten by urchins.
Why so many urchins? People catch too many lobsters and fish that eat urchins. Without these animals, urchins grow too much. Warm water helps urchins move to new places. My work with conservation groups shows urchins are a big danger to kelp.
Pollution
Pollution hurts kelp too. Extra nutrients from farms or cities can make bad algae grow. This blocks sunlight from kelp. In the 1980s, too many nutrients in Victoria’s water helped weedy seaweed grow. This fed more urchins. Less nutrients in some places also hurts kelp. Kelp needs food to grow.
Other Problems
Storms can pull kelp off rocks. Marine heatwaves are like hot days in the ocean. They can kill kelp fast. Building or fishing can hurt reefs too. All these things make it hard for kelp to stay healthy.
What Happens Without Kelp?
Losing kelp forests is bad. Animals lose their homes and food. Fairy penguins and sea dragons can’t hide without kelp. Fisheries lose money. Lobsters and abalone need kelp. This hurts fishers and Australia’s economy. The Great Southern Reef makes billions of dollars.
Kelp forests store carbon. This fights climate change. Without them, more carbon stays in the air. This makes climate change worse. Beaches wash away without kelp to slow waves. Divers and tourists miss the beauty of these forests. I’ve seen how this hurts people who love the sea.
How Can We Save Kelp Forests?
Good news! People are saving kelp forests. I’ve helped with these projects. I’m excited to share how we can bring kelp back. Here are the main ways.
Remove Sea Urchins
We can take away sea urchins. In California, divers took out 6,000 pounds of urchins from one spot. Kelp grew back. In Australia, projects like Operation Crayweed in Sydney remove urchins and plant kelp. I’ve worked on urchin removal in Tasmania. Fewer urchins help kelp grow. We also protect lobsters and fish that eat urchins.
Grow New Kelp
Scientists grow baby kelp in labs. At the Institute for Marine and Antarctic Studies, we collect kelp spores from healthy plants. We grow “kelplings” in labs and plant them on reefs. Divers put tiny kelp on ropes and lay them on the seafloor. Kelp can grow half a meter a day. Forests can come back in a year!
I work on growing kelp that likes warmer water. Some kelp is stronger. We grow those to make forests last. This helps kelp survive climate change.
Green Gravel
A fun way called Green Gravel helps. We grow宝宝 kelp on small rocks in labs. Then, we scatter these rocks onto reefs. The kelp grows and spreads. This makes new forests. It’s easy and works for big areas. I’ve seen it work in Victoria with golden kelp. We’re trying it for giant kelp too.
Use Cool Tools
New tools help save kelp. Google AI finds kelp forests and studies their genes. This helps us pick strong kelp to plant. At IMAS, we use AI to find kelp that can live in warm water. I’ve helped with this data. It’s cool to see tools help nature!
Keep the Ocean Safe
We must keep the ocean safe. Less pollution helps. Better fishing rules help too. We need to fight climate change. Marine protected areas limit fishing. This helps kelp and animals. I work with the Australian Marine Conservation Society to push for these areas.
We also need to cool the ocean. Using less oil and gas stops climate change. Groups like The Wilderness Society say oil drilling in the Great Australian Bight could hurt the reef. Clean energy helps kelp stay healthy.
Kelp Wins
Kelp restoration is working! In Sydney, Operation Crayweed planted kelp and removed urchins. Reefs came back. In California, otters ate urchins. This helped kelp grow. In Tasmania, IMAS projects planted small kelp patches. They’re growing fast.
I’ve led projects with the Great Southern Reef Foundation in Tasmania. We’ve seen baby kelp turn into small forests in a year. These wins show science and teamwork can save kelp.
Saving Kelp Is Hard
Saving kelp is tough. It costs money. It takes time. Removing urchins and planting kelp needs divers, boats, and labs. Warm water and storms can hurt new kelp. We need better maps to know where to plant.
The Great Southern Reef is huge. We’re planting small patches. Scientist Thomas Wernberg says we need bigger projects. My work looks at ways to make restoration faster and cheaper, like Green Gravel.
Why the Great Southern Reef Is Great
The Great Southern Reef is a treasure. Its kelp forests have animals like seadragons and cuttlefish. These animals live only here. The reef helps Australia’s economy with fishing and tourism. It makes over $10 billion a year. Kelp fights climate change by storing carbon. Losing kelp would hurt animals, people, and the Earth.
I’ve dived in Tasmania. I saw fish swim through kelp and penguins zoom by. I love this place. I want to protect it. The Australian Marine Conservation Society helps me. We’re making a difference together.
How You Can Help
You can help save kelp forests! Try these:
- Learn More: Watch White Rock or Reviving Giants to learn about kelp.
- Join Groups: Help the Australian Marine Conservation Society save the reef.
- Use Less Plastic: This keeps the ocean clean.
- Tell Scientists: Share if you see urchins or kelp at the beach.
I’ve worked with people who share urchin sightings. It helps us plan. Every bit helps!
The Future of Kelp Forests
The future of kelp forests is up to us. Scientists are planting kelp and keeping the ocean safe. Tools like AI help us find answers. Divers, fishers, and communities need to care.
About the Author
I’m Douglas Baltes, a marine biologist from the University of Tasmania. I’ve studied the giant kelp forests of the Great Southern Reef for five years. I work with the Australian Marine Conservation Society and lead kelp projects. I want to share these underwater wonders and save them. Check out my work with the Great Southern Reef Foundation or contact me to help our oceans!