Discovery of a Deep-Sea Ecosystem Living Without Sunlight in the Galapagos Rift
要点
- In 1977, the research submarine Alvin discovered volcanic chimneys at a depth of 2,500 meters in the Galapagos Rift.
- The first large animal ecosystem based on chemical energy (chemosynthesis) without sunlight was identified.
- The 13 photos taken changed the course of the study by imaging hot water vents teeming with marine life in the region.
- Giant tube worms, which have no mouth or gut, feed thanks to the bacteria they harbor inside them.
数字で見る
In 1977, the research submarine Alvin dove to a depth of approximately 2,500 meters in the Galapagos Rift. During this dive, conducted by geologists to examine the environment, massive white clam shells and clusters of worms were observed around volcanic fissures. This finding meant the discovery of the first known large ecosystem relying on chemical energy from the Earth's interior instead of sunlight.
The discovery was actually recorded not by a single momentary glimpse, but through a step-by-step process. Photos taken before the dive had indicated an unusual habitat on the seafloor and guided researchers to the area. The smell of hydrogen sulfide in water samples taken from the region proved that, instead of plant photosynthesis, bacteria were performing chemosynthesis to provide energy for these creatures.
The giant tube worms found in the region, known as Riftia pachyptila, are among the most striking examples of this chemical-based life. These worms lack a mouth and digestive system; instead, they harbor billions of bacteria inside them. These creatures, which feed on the organic matter produced by the bacteria, reveal how life on our planet can evolve under different conditions.
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よくある質問
- What made the 1977 Galapagos discovery so important for the scientific world?
- This discovery revealed the first large deep-sea ecosystem where the foundation of the food chain was not sunlight and photosynthesis, but chemical energy coming from the Earth's interior.
- What energy source do these deep-sea creatures use to survive?
- The creatures live relying on chemosynthetic bacteria that produce energy by oxidizing compounds such as hydrogen sulfide found in the water emerging from volcanic fissures.
- How do giant tube worms feed without mouths?
- These worms, called Riftia pachyptila, have no digestive system; they feed by using the organic molecules produced by billions of bacteria in their specialized organs.
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