What happens if kelp is overharvested?

Could you please elaborate on the potential consequences if kelp is excessively harvested? I'm curious about the ecological impacts, such as the impact on marine biodiversity and the balance of the ecosystem. Additionally, I'm interested in understanding the economic implications, including potential shortages in kelp-related industries and any potential ripple effects on the broader economy. Would overharvesting kelp also affect the local communities that depend on it for their livelihoods? Finally, are there any long-term consequences that might arise from overharvesting kelp? Thank you for your insights.