What If Gone

Species → Giant Tube Worm

Giant Tube Worm

Riftia pachyptila

No population figure exists — the species lives exclusively around…
Extinction risk Not Evaluated
Foundation speciesMarine environmentObligate mutualism
Giant Tube Worm (Riftia pachyptila)
Photo: Ifremer, Wikimedia Commons (CC BY 4.0)

What if it disappeared?

Impact Moderate
1 year

The giant tube worm forms dense clusters of tubes that cover the rock around a hydrothermal vent; without it, the shrimp, crabs, and other vent-specific invertebrates that shelter and feed within that mass of tubes would suddenly lose their main shelter at the site.

Hypothesis
10 years

After the 1991 eruption on the East Pacific Rise, tube worms colonized the new site, reaching 1.5 m and sexual maturity in under two years — the fastest growth ever measured in a marine invertebrate, likely necessary since a hydrothermal site can die out within just a few years. Without a tube worm able to move that fast, the vent's other species would have far less time to establish themselves before the site goes silent.

Extrapolated
Detail

Extrapolation à partir de Lutz et al. (1994), qui mesure la vitesse de colonisation du ver tubicole sans documenter directement l'effet de son absence sur l'installation des autres espèces de l'évent.

The tube worm's extremely fast colonization rate reflects the inherent instability of the hydrothermal vent ecosystem: a site can appear or die out within a few years depending on local volcanic activity. That speed suggests the tube worm acts as an early builder that no other species measured to date matches — without it, the usable window for the rest of the community to establish on a new site could close before anything else has had time to settle in.

What's missing to confirm it: No study directly measures the colonization speed of the vent's other species in the tube worm's absence, or whether they could establish themselves there without it before the site's life ends.

100 years

Over a century, the question would no longer be about one particular site — most active vents are born and die out within a few decades anyway. It would instead become: without a tube worm to colonize each new vent quickly, would the community that settles there stay as rich? Lacking such a fast builder, it's plausible that fewer species would manage to establish themselves before the next site goes extinct in turn.

Hypothesis
1000 years

Over a thousand years — dozens of cycles of vents being born and dying out — the tube worm's repeated absence as the first builder could leave hydrothermal vent communities permanently poorer, with no other known species recreating as quickly the same mass of tubes that shelters shrimp, crabs, and other vent-specific invertebrates.

Hypothesis

Documentation

Last verified: August 16, 2026