Sargassum aggregations in the open ocean provide vital habitats for numerous marine species, yet their influx on beaches—known as Sargassum inundation events (SIEs)—negatively affects coastal ecosystems. While Sargassum is recognized as Essential Fish Habitat, excessive accumulations lead to poor water quality and block light necessary for the survival of seagrasses and corals. This reduction in light and oxygen can result in mass mortalities of aquatic life, including fish and turtles, and promote the growth of invasive species.
The decomposition of Sargassum generates turbid water and releases nutrients that disrupt local ecosystems, potentially causing shifts in species composition and increased erosion. Sea turtles face additional challenges as beaching Sargassum hampers nesting success and hatchling survival due to temperature changes. In summary, while Sargassum provides habitat in the open sea, its overwhelming presence in coastal areas poses severe threats to marine life and ecosystems.
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