Deep sea secrets: What is a whale fall?
GS3Economy · S&T · Environment · Security· Biodiversity & conservation· Prelims·
Why in news
Scientists discovered the world's largest known whale graveyard in the Indian Ocean, highlighting the role of 'whale falls' in deep-sea biodiversity.
Background
The graveyard spans 1,200 kilometers at depths up to 7,000 meters in the Indian Ocean's Diamantina Zone. It contains nearly 500 skeletons dating back 5.3 million years, suggesting the presence of a now-extinct whale species.
Facts for Prelims
- PlaceDiamantina Zone: A deep-sea region in the Indian Ocean where the graveyard was discovered.
- EnvironmentWhale fall: A phenomenon where a whale carcass sinks to the ocean floor, providing a massive nutrient source for deep-sea ecosystems.
- FactThe discovery includes skeletons dating back approximately 5.3 million years.
- S&TFendouzhe: A deep-sea submersible used by the Chinese Academy of Sciences for the expedition.
For Mains
Q. Discuss the ecological significance of 'whale falls' in maintaining deep-sea biodiversity and the importance of protecting these marine carbon sinks.
Dimensions to cover in your answer
- Nutrient cycling: Whale carcasses provide essential organic carbon and nitrogen to nutrient-poor abyssal zones.
- Biodiversity hotspots: Scavenger and decomposer communities (brittle stars, bivalves) rely on episodic organic falls for survival.
- Paleo-ecological insights: Skeletal remains provide data on extinct marine species and historical oceanographic changes.
Keywords: Deep-sea biodiversity · Nutrient cycling · Marine ecosystems · Carbon sequestration · Abyssal zone
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