How does the vampire squid defend itself in darkness?
The vampire squid is a cephalopod adapted to oxygen-poor midwater and, despite its name, mainly collects organic particles.
Body plan, feeding and the marine environment
Low metabolism, large gill area and an oxygen-binding respiratory pigment support life in oxygen-minimum zones. Long sticky filaments collect organic particles called marine snow. When threatened, it turns its arms and webbing over the head, creating a dark cloak with spine-like projections. Relationships among marine invertebrates cannot be inferred from appearance alone because similar forms can evolve in different lineages. Pressure, light, temperature, salinity and currents shape feeding and movement. Laboratory observations may not represent the full behavior seen in nature.
Ecosystem function, defense and conservation
Instead of an ink sac, it can release a cloud of glowing particles from light organs and change direction to escape. Large eyes detect movement in faint light. Expansion of oxygen-minimum zones may shift distribution, although temperature and food effects must be considered together. These animals may shape ecosystems through filtration, decomposition, sediment mixing or reef building. Warming, deoxygenation, acidification, plastic, seabed damage and overharvest are considered together. Conservation targets habitat processes as well as individual species.