Oil Spills Damage the Ocean

Imagine walking along the beach and suddenly seeing a big, sticky, black stain of oil in the sand. Disgusting, right? Oil spills pose significant dangers to various habitats and environments. In the ocean, spills can cause problems for animals such as fish and corals [1]. But there is good news! The environment has some good friends who can help fight back against this damage—bacteria. These little friends play a vital role in helping to maintain the health of ocean ecosystems [1, 2].

What are Bacteria?

Bacteria are microorganisms that are invisible to the naked eye. Bacteria are found everywhere, even inside our bodies. Many people think bacteria only causes diseases, but actually, most of them help us stay healthy! Outside of our bodies, microorganisms are everywhere: tables, pencils, cups, clothes, shoes, and in natural environments like forests and the ocean. Microorganisms are essential for maintaining the balance of life on Earth. Bacteria and other microorganisms help in many ways, like producing nutrients for plants, creating medicines, and even removing pollutants like oil [3].

Some special bacteria are hydrocarbonoclastic, or “oil-combating”. These tiny creatures fight the oil and convert it into substances that are less harmful to the ocean and its inhabitants [4]. This process is called biodegradation, and it breaks the oil down into smaller microscopic pieces, so it can be more easily removed [1, 4]. Instead of using just one type of hydrocarbonoclastic bacteria for this goal, several types can be used together, like an army. Their different powers, some stronger than others, can complement each other and increase the chances of success. In such cases, it is important to be sure that the various types of bacteria are not harmful to each other, and that they can grow and function together, like the Justice League of microorganisms [4].

What is Oil and How Do Bacteria Combat It?

Petroleum oil is a complex mixture that includes the remains of ancient animals and plants that lived on Earth millions of years ago. This oil is black, sticky, and oily and is formed because of the pressure and heat deep underground. Oil can be used to produce various products used in daily life, such as fuels, plastics, and even clothing. Because so much oil is needed, the risk of accidental oil spills is very high.

When an oil spill happens, the bacteria use their secret weapons— substances called enzymes and biosurfactants. Enzymes can break oil into tiny pieces that bacteria can use as energy source. Biosurfactants work like soaps, turning the oil spill into small droplets. This makes it easier for the bacteria to contact and break down the oil [1, 3–7] (Figure 1).

Why is Cleaning Up Oil Spills Important?

When bacteria are used to help clean up oil spills, they help the environment by protecting animals like fish, turtles, sharks, marine birds, and corals. By protecting coral reefs, hydrocarbonoclastic bacteria also help the whole ocean, since many marine animals live in reefs or depend on them in some way (think of the movie Finding Nemo) [7, 8]. Without these tiny helpers, an oil spill could cause serious harm to ocean, like suffocating corals, killing fish, and disrupting animals’ feeding habits and lifestyle. A healthy ocean helps keep our entire planet healthy!

How Can We Use Hydrocarbonoclastic Bacteria?

Scientists around the world are studying how to use hydrocarbonoclastic bacteria as powerful allies in the fight against pollution. One great idea is creating bioproducts that can be applied directly to affected areas, like a specialized cleaning solution to tackle oil spills [2, 9]. Some cleaning products used today can hurt nature instead of helping. So, hydrocarbonoclastic bacteria that are already native to the ocean might be more effective and not cause harm to marine organisms and the sea. Plus, they might even be able to produce other important substances that help protect sea life from different types of pollution, fighting coral bleaching and ocean acidification [2].

What Did We Learn?

Hydrocarbonoclastic bacteria are remarkable microscopic creatures that play a crucial role in combating environmental pollution. These tiny helpers do not just work in marine environments, they can also help clean up other ecosystems like mangroves, estuaries, rivers etc., making a significant impact and improving the health of animals, humans, and the environment. These amazing microorganisms remind us to see bacteria as important allies, not just villains that make us sick. By helping us reduce several kinds of contamination and pollution, hydrocarbonoclastic bacteria can be an important tool for protecting our planet and making it a better place to live!

Glossary

Hydrocarbonoclastic: ↑ Describes bacteria and other microorganisms, like fungi, that can break the carbon bonds in the chemical structure of petroleum.

Biodegradation: ↑ The process used by microorganisms to break down complex chemical structures into simpler substances that they can “eat” for energy.

Petroleum: ↑ Petroleum is a complex mixture of hydrocarbons, that is oily, sticky and black. This compound is used in many industries, it can be highly toxic to the environment, especially when spilled into the ocean.

Enzymes: ↑ Proteins that speed up chemical reactions in living organisms, allowing cells to carry out the processes needed to stay alive.

Biosurfactants: ↑ Molecules that change how oil and water interact, breaking thick oil into tiny droplets so it is easier to move or clean up.

Bioproducts: ↑ Products produced using biological components, which can be used in agriculture and ocean recovery, for example, and can include biochemicals and biofuels.

Coral Bleaching: ↑ Is a stress response in reef-building corals. When it occurs, the corals expel the symbiotic algae living in their tissues making the corals to turn white and become more vulnerable and can lead to their death.

Ocean Acidification: ↑ Describes a decrease in ocean pH, resulting from the absorption of carbon dioxide (CO₂) released by human activity, and can make more difficult for corals to maintain their calcium carbonate skeletons.

Conflict of Interest

The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

The author acknowledges CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil) for the scholarship and research support and the Laboratory of Molecular Microbial Ecology, Institute of Microbiology Paulo de Goes, Federal University of Rio de Janeiro, Rio de Janeiro.

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