Which of the following is an impact of climate change on marine ecosystems?

Coral bleaching events are a significant impact of climate change on marine ecosystems. When ocean temperatures rise due to global warming, corals experience stress and expel the symbiotic algae (zooxanthellae) that live within their tissues. These algae are crucial for coral health as they provide energy through photosynthesis and contribute to the vibrant colors of corals. Without the algae, corals lose their color, appear white (hence "bleaching"), and become more susceptible to disease and mortality. This process disrupts the entire coral reef ecosystem, affecting the species that depend on corals for habitat and food.

The other options highlight conditions that either do not accurately represent the effects of climate change on marine ecosystems or suggest improvements that are not supported by current scientific understanding. For instance, an increase in water clarity typically happens as a result of reduced nutrient pollution, not directly linked to climate change, while stabilization of ocean temperatures does not reflect the reality of rising average temperatures related to climate change. Similarly, reduction in ocean currents may result from changes in climate patterns but does not encompass the broader and immediate impacts experienced by marine biodiversity, such as coral bleaching.