Recovery trajectories during state change from bare sediment to eelgrass dominance

• Published in: Marine ecology. Progress series (Halstenbek) 2012-02, Vol.448, p.209-222
• Main Authors: McGlathery, Karen J., Reynolds, Laura K., Cole, Luke W., Orth, Robert J., Marion, Scott R., Schwarzschild, Arthur
• Format: Article
• Language: English
• Subjects: Ecosystem services; Habitat conservation; Littoral ecosystems; Marinas; Marine; Marine ecosystems; Meadows; Productivity; Sediments; Seeding; THEME SECTION: Eelgrass recovery induces state changes in a coastal bay system; Trajectories; Zostera marina
• ISSN: 0171-8630; 1616-1599
• DOI: 10.3354/meps09574

Seagrasses are important foundation species in shallow coastal ecosystems that provide critical ecosystem services including stabilizing sediment, sequestering carbon and nutrients, and providing habitat and an energy source for a diverse fauna. We followed the recovery of functional (primary productivity, carbon and nitrogen sequestration, sediment deposition) and structural (shoot density, biomass, plant morphometrics) attributes ofZostera marina(eelgrass) meadows in replicate large plots (0.2 to 0.4 ha) restored by seeding in successive years, resulting in a chrono sequence of sites from 0 (unvegetated) to 9 yr since seeding. Shoot density was the structural metric that changed most significantly, with an initial 4 yr lag, and a rapid, linear increase in plots 6 to 9 yr after seeding. Changes inZ. marinaaerial productivity, sediment organic content, and exchangeable ammonium showed a similar trend with an initial 4 yr lag period before differences were observed from initial bare sediment conditions. After 9 yr,Z. marinameadows had 20× higher rates of areal productivity than 1 to 3 yr old meadows, double the organic matter and exchangeable ammonium concentrations, 3× more carbon and 4× more nitrogen, and had accumulated and retained finer particles than bare, unvegetated sediments. These results demonstrate the reinstatement of key ecosystem services with successful large-scale restoration, although none of the parameters reached an asymptote after 9 yr, indicating that at least a decade is required for these attributes to be fully restored, even in an area with high habitat suitability. Survivorship along a depth gradient showed that ~1.6 m (mean sea level) is the maximum depth limit forZ. marina, which matches the ‘tipping point’ for survival predicted for this system from a non-linear hydro dynamic/seagrass growth model.