Animal
Ribbed mussel
Geukensia demissa
A native salt-marsh mussel that lives semi-buried in the muddy substrate of *Spartina* cordgrass marshes — and one of the keystone species of the Atlantic-coast salt-marsh ecosystem. Filters phytoplankton at high rates; the mussel's deposition of pseudofeces near *Spartina* roots is a significant nitrogen-input pathway that fertilizes the marsh grasses. Common in Staten Island's remaining salt marshes.
Scientific
Geukensia demissa is a 2–4 inch saltwater mussel native to the Atlantic coast from the Gulf of St. Lawrence to the Yucatán. Lives semi-buried in cordgrass-marsh substrate, attached by byssal threads to Spartina roots and to other mussels. Filter-feeds plankton from tidal water during high tide.
Documented mutualism with [[smooth-cordgrass|smooth cordgrass]]: ribbed mussels deposit nitrogen-rich pseudofeces near Spartina roots, fertilizing the grass; the grass stabilizes the substrate that lets the mussel beds persist. The two species are tightly coupled.
Not a major commercial species (tough, salty, less tasty than blue mussels). Ecologically, however, the ribbed mussel is a foundation species of healthy salt marsh.
On Staten Island
Common in the borough’s remaining salt-marsh habitat — Lemon Creek, the harbor edges of [[mount-loretto-unique-area|Mount Loretto]], tidal flats around the South Shore. Where Spartina is healthy, ribbed mussels are present; where the marsh has been degraded or filled, both species are gone.
See also
Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.
- Substrate of: [[smooth-cordgrass]] · [[new-york-harbor-estuary]]
- Member of: [[animal]]
- Contained by: [[staten-island]]
Sources
- [[beacon-ny|New York]]/New Jersey Harbor Estuary Program salt-marsh foundation species documentation
- Long-term Spartina-mussel mutualism literature (Bertness 1984)
Rooted in life.
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