We are back with our spotlight on coral. Pocillopra damicornis is the third principal hard coral that we work with in Costa Rica. Our coral intern Sebastian has created this great article all about it.
Here are some cool coral facts about Pocillopora damicornis!
What is Pocillopora damicornis?
Pocillopora damicornis is a species of branching stony coral, commonly known as Cauliflower coral. The species is distinguished from other species by having thinner branches and less regular verrucae. While small, regular verrucae exist, most of the protuberances are irregular and are often not true verrucae at all but are more like incipient branches. As a result, Pocillopora damicornis exhibits greater branching than does P. verrucosa. Colonies are usually less than 30 cm tall. Reported growth rates of Pocillopora damicornis vary substantially between locations in the Eastern Tropical Pacific, from 1.27 cm per year in Colombia to 3.96 cm per year in Panama.
Pocillopora damicornis occurs at all depths between the surface and 40 m deep or more, and is particularly abundant between 5 to 20 m. It is equally abundant in lagoonal areas and clear water reef slopes. Commonly forms monospecific, densely packed stands many tens of metres across in water 5 -10 m deep.
Restoration Success with Pocillopora damicornis
We started our coral restoration project with Pocillopora damicornis and Pavona gigantea. Pocillopora is a great candidate for reef restoration, as a branching coral it is easy to harvest from wild coral colonies and it is also relatively easy to micro fragment. Pocillopora has responded well in our coral nurseries with good growth rates in both table nurseries and line nurseries. This coral species has a faster growth rate than the two massive coral species, which means shorter time in the nurseries, and therefore less maintenance and costs.
Geographic Range of Pocillopora damicornis
Pocillopora damicornis has a broad range which extends from the pacific coast of the americas america all the way to East Africa and the Red Sea. in the tropical pacific and through to oceania and southeast asia. The range of this coral in panama is it even considered as one of the major reef building species.
Feeding methods of Pocillopora damicornis
Cauliflower corals are a filter feeding species that catch plankton and other small organisms from the water column using their hair-like tentacles.
Sexual Reproduction of Pocillopora damicornis
Pocillopora damicornis is a broadcast spawner with the capacity to function as a simultaneous hermaphrodite. Pocillopora damicornis, like other Pocilloporid species in the eastern Pacific, has low rates of recruitment.
Histological evidence indicates that spawning is likely to occur during a few days around the new moon. The reproductive activity in the eastern Pacific is related to local thermal regimes. This then results in a generally higher incidence of coral recruits at sites with stable, warm water conditions. Also during warming periods in areas that experience significant seasonal variation. Pocillopora damicornis is also able to spread asexual due to natural fragmentation, making this coral a good candidate for restoration efforts.
Specific Living Conditions for Pocillopora damicornis
temperature: 20 °C -30 °C (optimal is 26 °C )
salinity: 34- 38 ‰
Depth: 0-40 meter
Ph: 8,1- 8,4
Habitat: occurs in all shallow water habitats from exposed reef fronts to mangrove swamps and wharf piles
sedimentation, Pocillopora is relatively tolerant as long as there is adequate water motion
We hope you enjoyed the article, thank you to our intern Sebastian Moesbergen for writing it.
If you are interested in joining our team at Marine Conservation Costa Rica you can contact us. We run internships, volunteer programs and research opportunities, please contact us here.
We are continuing our Spotlight on Coral Series of Blog. This week we look at another or our 3 types of hard coral that we are fragmenting in our coral restoration project at Marine Conservation Costa Rica. So here’s an indepth look at Pavona gigantea…..
What is Pavona gigantea?
Pavona gigantea is known as plate coral or leaf coral. It is a common coral that grows in relatively shallow and protected areas. Pavona has a naturally occurring growth rate of between 9 and 12 mm each year and also grows large plate colonies. They have visible coralites with a width of between 3 and 6 mm. The colonies tend to have a furry appearance due to the extension of their tentacles during the day.
Restoration Success with Pavona gigantea
Pavona gigantea can be relatively easy to harvest and fragment, as it often grows in plate formation. The younger growth to the edge of a plate is often thin and can be easily harvested. The older growth is thicker and extremely dense. The Pavona has responded well to micro fragmentation in our restoration project. Pavona gigantea seems to be reasonably resilient to stress and we have had a low mortality rate.
Geographic Range of Pavona gigantea
Pavona gigantea is found in the pacific ocean, growing along the coast of middle america from Mexico to Ecuador and in the Galapagos and Cocos Islands. In the Mid- Western Pacific, it is found in reefs located in the middle of the ocean. This is around the body of water between Japan and Papua New Guinea.
Feeding methods of Pavona Gigantea
Corals consume particulate organic matter and absorb dissolved organic matter. However, their consumption of plankton is limited to zooplankton that is in the 200- 400 μm size range. They use their tentacles to obtain this food. The same as other hard corals, Pavona gigantea depends on receiving most of its energy from it’s symbiotic relationship with the Zooxanthellae. These use photosynthesis to harness energy..
Sexual Reproduction of Pavona Gigantea
Typically Pavona gigantea colonies are gonochoristic, broadcast spawners. This is that there are both male and female colonies releasing eggs into the water column. Spawning takes place at the beginning of the rainy season, normally between May and July. Interestingly, in a few studies of Pavona gigantea, hermaphroditic colonies have also been discovered! This is likely to be an example of sequential cosexuality. It is when corals can begin their reproductive life as males and then become hermaphroditic. It has been suggested that sequential cosexuality is an adaption to guarantee sexual reproduction and increase connectivity among populations.
Specific Living Conditions for Pavona gigantea
Temperature: 18 °C -29 °C Salinity: 34- 37 parts per thousand Depth: abundant between:0,5 -20 meters Ph: 8,1 Dissolved oxygen concentration: 4.55 mL/L
We hope you learnt something. Thank you Sebastian for the great info and help with this. If you want to learn more about our project you can contact us here or apply to become a volunteer or intern here in Costa rica.
Coral bleaching, the phenomenon, the event that has brought scientists from all around the world together to discuss a single question- what is happening to our coral? Climate change skeptics and environmental downfall contributors have no other option than to acknowledge the reality of this current mass global issue.
An event that has been trending and turning heads from all over, even reaching world news. It has made its way to fame and has quickly gotten the attention of the human race- but do you really know what coral bleaching is?
So what is coral?
Looking at coral from its outward appearance, it can be disguised as a simple being that has no other purpose than for fish to inhabit and feed on. Some even mimic a rock substance. It is only when you look within that you realize that it is not a simple being at all.
Coral colonies are made up of tiny, yet extraordinary polyps that resemble sea anemones. An algae called Zooxanthellae, or Zoox, benefits the coral by living inside the polyps and photosynthesizing. This provides the necessary nutrition a coral needs to be able to be, well, coral.
Benefits of coral
Scientists are fascinated with the advantages that coral provides. In reality, these ancient and complex animals are what millions depend on for their survival. Some benefits of the reef include protection from tropical storms and waves. Also tourism, food, habitat and protection for many marine species, and even medicine. Imagine what would happen if we were to lose all of this due to the recklessness of our own generation? Well, the truth is that we already are on our way to doing so.
Our environment is sufferering
When you take a step back from the normality that our society has been convinced is sufficient and ideal, you will be shocked. As humans we have developed this hunger for more. We can’t get enough whether its money, power, food, clothes, etc. Then we are basing these needs off the idea that we will never run out, thus mass producing. It is only when we wake up from this false mentality that we can see what we are doing to our planet. The environment has been silently suffering from our carelessness for a long time. But it is finally grabbing our attention through natural disasters such coral bleaching.
Our carbon pollution is affecting our climate worldwide, especially our oceans. With life as fragile as coral, the rising temperature of only a few degrees can dramatically alter their ability to function. This can almost certainly lead to fatality, or otherwise known as bleaching. Car pollution, factory pollution, mining and burning of coal, and other destructive actions of man are collectively working together to kill coral reefs by stressing them out.
Like humans who react to fevers, the coral reacts to heat by expelling the zooxanthellae. The disruption of the zoox and coral relationship causes the coral to starve. This is due to the lack of nutrients obtained through photosynthesis. They then turn the color white we so famously see, giving it the name “bleaching”. Although most believe that a coral is dead once it has turned this holy white, it is actually still alive. It has the potential to recover. It is only once the tissue is extracted and rotting from the coral that it is officially too late.
Other factors like overfishing, pollution, and sunscreen, work as a team to cause coral bleaching on our coral reefs. If we continue to go down this wasteful and harmful path, we will only increase the severity of coral bleaching. A species that has survived for centuries is now depleting in only a few years due to the intensity of our ways. It can take decades for a reef to recover and less than a decade to destroy it. If we continue our mass burning of fossil fuels and increase our carbon pollution in the atmosphere, these severe bleaching events will continue annually. Coral is vital to life on Earth and the mass bleaching events are a cry for help. It is now up to us to ensure that the coral reefs are not gone for good.
Coral reefs are referred to as the underwater cities of our planet. Diverse species collect and congest the underwater habitat. This gives them an appearance of hectic yet systematic city traffic. Warm-water fish and other marine species gather throughout the ecosystem due to their dependency.
This mass collection of colorful marine life allows many curious visitors to experience such beautiful and natural entertainment. Although when coral reefs are brought up for discussion, we tend to think of this tropical climate only a few feet below the surface, but that is not always the case. Here are some fun facts about the amazing coral reefs that maybe you didn’t know.
They are not just shallow water lovers..
Deep-sea coral reefs can thrive as deep as 2,000m below sea level. With little to no exposure to sunlight, they result to feeding on microscopic organisms where current flow is accelerated. Other marine organisms such as deep sea shrimp and crab depend on these tree like shaped structures for habitat. Deep-sea corals grow about 5-25mm a year and form groves of tree, feather, column, or fan structures. Although they take their time, the underwater gardens created in the depths are very extraordinary. Enough to keep scientists wanting more, despite what little knowledge we currently possess about the depths.
They have healing properties
Scientists may not have all the answers to questions associated with the depths of our oceans. Although we like to think that we have all the answers about the purpose of more shallow water reefs. We are constantly discovering new key advantages the reef provides for not only marine life, but for humans. Scientists have discovered that the coral’s chemical compounds they produce can be used for numerous healing techniques and medications. For example, for patients suffering from illnesses such as heart disease, viruses and human bacterial infections. Also Alzheimer’s disease, and even cancer. Much more research is still in store, but coral reefs have been considered the “medicine of the 21st century”.
They have ways of looking after themselves too
Coral reefs are being studied worldwide for their ability to heal humans suffering from various illnesses. They are also being consumed by these humans globally. Yet who is taking care of the coral when they are sick? Different reactions have been displayed by the coral in an effort to get our attention. I think by far the most fascinating presentation has been the Glowing Corals. Coral Bleaching has been a recent but very serious issue which is caused by climate change and has caused the coral to suffer greatly from the heat. In response, the coral develops a sunscreen-like chemical that is very vibrant, giving off a fascinating glow throughout the reef.
Watch your sunblock please!
Although corals are able to produce sunscreen, the topic of sunscreen still needs to be discussed. Studies have shown that many top brand sunscreens we use such as Tropicana and Coppertone possess harmful chemicals like Oxybenzone and Octinoxate which are essentially absorbed by the coral. The chemicals accumulate in the tissue and cause the same reaction to coral as rising ocean temperatures do, coral bleaching. Places such as Hawaii and Palau are taking part in the banning of harmful coral reef sunscreens and a better future for the underwater ecosystem is hopeful.
Plastic? No thank you!
We are fighting for a better future for coral reefs globally but face many obstacles caused by the destructive behavior of man. One of the most concerning issues is the pollution of plastics. Studies found that Astrangia corals actually prefer microplastics over their regular diet (shrimp eggs). Because there is such a large quantity of plastic found in the ocean, researchers have found over 100 pieces of microplastic in the guts of wild coral. I guess you could call this a guilty pleasure.
Eating is a friendly affair
Coral must have a strong digestive system to consume that much plastic. How do corals consume plastic and other food daily? They do not have eyes therefor it is impossible to hunt visually. Instead, they have strategically developed a relationship with tiny algae living within them called zooxanthellae. The zoox capture sunlight which is converted into sugar for energy. The energy is then transferred to the coral polyp and provides the necessary nourishment. Coral also uses its intelligence to capture food in a very different way. At night, the coral polyps arise from their skeletons and use their stinging tentacles to capture tiny floating zooplankton nearby. Once the prey is captured, it is then pulled into the corals mouth and digested. This strategy therefor classifies coral as an animal.
Lets get it on……
Like every animal, corals reproduce. But as you can tell by now, nothing about coral is “normal” or “boring”. Of course neither is their reproductive system. They can reproduce both asexually and sexually. Coral reproduces asexually by budding or fragmentation. When budding, the new polyps leave their parent polyps and form new colonies. When fragmentation occurs, an entire colony of coral breaks off to form a new colony. This method is used in many coral restoration efforts. But this also occurs due to storm or boat grounding.
When Coral reproduces sexually, both sperm and egg is released. For some corals, such as Elkhart and Boulder corals, one colony will produce sperm while another colony produces only eggs. For other coral species such as Brain coral, both sperm and eggs are produced at the same time. The coral larvae can be fertilized in either the body of the coral or in the surrounding water. This process is called spawning.
Synchronization is key
Spawning can occur as a mass synchronized event which draws in many curious visitors. The larvae make their way to the surface of the ocean, which gives off a rather out of this world appearance. Then they make it to where the water meets the air. Following that they begin their final descent back to the ocean floor where they will settle and attach to a hard surface (that is, if they don’t get eaten first). Once attached, they begin their growth cycle and start the process all over again. It is not an easy life for coral, but their complexity and beauty is what keeps us wanting to know more. We still have much to learn about coral reefs and its inhabitants, but the facts that we have discovered shape our way for the future.
November to me, always brings a sense of anticipation. You can feel the summer coming to Costa Rica. In October, businesses take their annual vacation and boats get their bottoms painted November though is the start of the new season. Here at Marine Conservation Costa Rica we are also really excited to get back in the water!
Starting this season, we welcome John Reinbott to our crew. John is a marine biologist and is fresh from a year long internship at the Coral Restoration FoundationTM in Florida. John and I are going to be working closely together on our coral restoration project. This last week we have been looking at the nurseries. We have also been brainstorming lots of ways we can improve on our current methods…and it’s been fun!
We also welcome Anna, our new coral intern from Ecuador. She will be helping us with data collection, maintenance and cleaning. Also building new structures and community education. Looks like it’s going to be an amazing season!
With the new season underway we are excitedly continuing our week here in Costa Rica. We have already established a nursery here in Manuel Antonio and are working hard to expand it and the studies that we are doing on the corals. Our work is an essential part of restoring the reef and we are in the ocean regularly during the week. Whether it is fragmenting, planting in the nursery or completing health surveys on the surrounding areas, the work never stops.
As part of our expanding project we are in need of some special tools to help with the coral nursery. When fragmenting the corals, it is essential that it is done in an efficient and safe way, to ensure that they have the best chance of regrowing once we outplant them back onto the coral reef. Because of this we have a list of tools that would be extremely valuable in enabling us to do that. This includes a diamond band saw and an underwater powerdrill as well as other smaller tools. The total cost for these tools is $1500 and for this, we are turning to you. We are asking for donations to our tool project so that we can continue our work in the best way possible. It is for us and for our oceans.
If you are able to donate anything, please click on the link below and attach your details, so that we can thank all of the generous people that have helped us.