The impact of global climate change on ocean ecosystems is very significant and has the potential to cause major changes to marine life. One of the main impacts is rising ocean temperatures, which have risen by an average of 1°C compared to before the industrial era. This increase in temperature causes uniform warming of the water, disrupting the distribution of fish species and potentially causing mass migration of fish to cooler areas, changing ecosystem dynamics. Apart from that, increasing sea temperatures also accelerate the bleaching process of coral reefs. Corals stressed by high temperatures expel symbiotic algae that provide them with color and nutrition, resulting in coral death. It is estimated that 70% to 90% of coral reefs around the world are threatened with extinction due to bleaching. Loss of coral reefs means loss of habitat for many marine species, which impacts the food security of coastal communities. Climate change also leads to increased ocean acidity due to increased concentrations of carbon dioxide (CO2) absorbed by the ocean. This drop in pH is dangerous for species that rely on calcium carbonate, such as shellfish and mollusks. The effects of ocean acidity can disrupt shell formation and reduce the population of these species, which in turn can affect the food chain. Additionally, changing weather patterns are increasing the frequency and intensity of tropical storms. Stronger storms have a direct impact on marine ecosystems, such as damaging coral reefs and increasing waste into the ocean which can add to pollution. Flooding can carry excess nutrient material into the ocean, causing eutrophication that upsets the balance of ecosystems and causes “dead zones” — areas without oxygen. Rising sea levels are also a real impact of climate change, threatening coastal ecosystems such as mangroves and seagrass beds. This ecosystem is very important as a breeding ground for many species of fish and acts as a natural filter for the water. This loss of habitat reduces marine biodiversity and threatens the sustainability of natural resources for communities that depend on the sea. On the other hand, invasive species spread more easily in warmer conditions, affecting local species and causing shifts in ecosystem community composition. This increases competition and can lead to the extinction of local species. From a socio-economic perspective, climate change in the oceans has the potential to increase uncertainty in the fishing industry. The decline in fish stocks and changes in migration patterns have an impact on the income and food security of communities that depend on fisheries. Therefore, appropriate adaptation and mitigation strategies are needed to maintain the sustainability of marine ecosystems and the communities that depend on them.
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