New Insights into Deep-Sea Sponges' Survival Strategies in Complete Darkness
Deep-sea sponges survive in complete darkness in ways we didn’t know before

Image: The Conversation
Deep-sea sponges, particularly _Calyx_ sp., thrive in complete darkness using unique survival strategies. They rely on symbiotic microbes for energy, utilizing both chemosynthesis and heterotrophy to convert ammonia and organic matter into biomass, supporting diverse marine ecosystems. However, these fragile habitats face threats from human activities.
- 01Deep-sea sponges form extensive ecosystems on the ocean floor, acting as habitat providers for various organisms.
- 02The study identifies that 16% of microbial partners in _Calyx_ sp. sponges utilize chemosynthesis, while 84% rely on heterotrophy.
- 03Heterotrophic microbes can break down complex organic compounds, allowing sponges to access nutrients from scarce organic matter.
- 04Deep-sea sponge gardens are recognized as vulnerable ecosystems by the United Nations due to their ecological significance.
- 05Human activities such as deep-sea trawling and mining pose significant threats to these fragile ecosystems.
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Deep-sea sponges, particularly the species _Calyx_, inhabit the dark depths of the ocean, forming vast ecosystems that are crucial for marine biodiversity. These sponges utilize unique survival strategies, relying on symbiotic microorganisms to thrive in an environment devoid of sunlight. A recent study published in the journal Microbiome reveals that about 16% of the microbial partners in these sponges engage in chemosynthesis, using ammonia as an energy source to convert carbon dioxide into biomass. The remaining 84% of microbes are heterotrophic, consuming organic matter, which is scarce in the deep sea. These microbes possess specialized enzymes that allow them to break down complex organic compounds, providing essential nutrients to their sponge hosts. Despite their ecological importance, deep-sea sponge gardens are under threat from human activities such as trawling and mining, which can devastate these habitats. The United Nations has recognized these ecosystems as vulnerable, highlighting the need for conservation efforts to protect them before their roles in the carbon cycle are fully understood.
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The degradation of deep-sea sponge gardens could disrupt marine ecosystems and the carbon cycle.
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