coral We are familiar and strange It is sometimes a decoration in the living room Sometimes it is a "coral block" picked up on the beach Sometimes in the aquarium Colorful fantasy world Corals are rich in color and various in shape Some people think that coral Like bushes, trees, and a sea of flowers It should be a plant Someone has picked up "corals" on the beach. Hard texture I think it should be stone Is coral an animal, a plant, or a rock? Let’s learn more about it ▼ Corals are animals, from the same family as jellyfish Corals are made of seafloor organisms—— Aggregates of coral polyps So to be precise Corals are animals They catch food with the tentacles on their heads. Classification From the same family as jellyfish Coral polyps are coelenterates The individual is very small Living in groups for generations Strictly speaking Coral is an aggregate of coral polyps Can all corals turn into coral reefs? According to whether hard reefs can be formed Corals are divided into two categories: reef-building and non-reef-building. Coral polyps Can absorb calcium and carbonate ions from seawater Synthetic calcium carbonate This is the "skeleton" that supports its shape. It's just that its "skeleton" grows outside the body—— On the corals picked up at the beach Full of small holes Coral polyps spend their entire lives in holes After death, its body decomposes Skeletons turn into reefs It also forms the foundation for new coral polyps. Cycle After tens of thousands of years of accumulation It can grow into a coral reef on the seabed When the geology changes Undersea reefs rise above the sea surface Coral reef islands will be formed World famous tourist destination Great Barrier Reef off the east coast of Australia That's the piece. Mixed with corals, shells, etc. Huge reef of marine debris Non-reef-building corals Calcium carbonate skeleton But it's too small When coral polyps die, their carcasses separate and dissipate. Nothing will be left Where does coral get its color? 1. Ingredients from coral: Zooxanthellae Reef-building corals usually live near the coast. Almost transparent body Its ingredients: Zooxanthellae have their own color After being eaten by coral polyps Zooxanthellae remain inside the coral polyps Become its "tenant" Spend some quality time together The color of zooxanthellae Also seen on reef-building corals So, the corals we see offshore Mostly yellowish brown 2. From chromoproteins and fluorescent proteins Except yellowish brown Other brilliant colors come from Chromoproteins and fluorescent proteins in corals Red, pink, blue, purple Even has its own fluorescent effect Can corals be "planted"? Corals can reproduce sexually or asexually Sexual reproduction is for the purpose of establishing new territories Asexual reproduction is for expanding territory Corals will grow small buds Or separate new individuals This makes it possible to "grow" coral artificially ↓↓↓ What is the use of protecting corals and coral reefs? Coral reefs protect coastlines Helps maintain seafloor biodiversity A single coral reef can support up to 400 species of fish Species of organisms living in coral reefs As many as tens of thousands Formed an "underwater tropical rainforest" Coral beautiful dream In our country, most of them are protected by law It is illegal to steal, buy, sell or damage them privately. Protect the environment and protect corals Build a beautiful home together~ Content source: "Bowu" magazine, "Walking Coastline", "Man and Nature", Baidu Encyclopedia, etc. Editors of this issue | Ren Liang, Wang Yexuan (internship) |
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