During secondary succession, how do seeds get to the island?

Secondary succession, type of ecological succession (the evolution of a biological community's ecological structure) in which plants and animals recolonize a habitat after a major disturbance—such as a devastating flood, wildfire, landslide, lava flow, or human activity. significantly alters an area but has not rendered it completely lifeless. Secondary succession is distinguished from primary succession, in which a biological community develops where no life had existed previously. Secondary succession takes place where a disturbance did not eliminate all life and nutrients from the environment. So forth preserving the remaining seeds and being delivered by birds