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<p>Seagrasses rank among the most productive organisms on Earth due to their exceptionally high rates of photosynthesis. Long-term measurements of net ecosystem productivity are essential for assessing ecosystem health and evaluating the carbon sequestration potential of seagrass meadows. Oxygen ebullition constitutes a significant, though frequently neglected, component of net ecosystem productivity in aquatic systems. Using acoustic methods to quantify the contribution from ebullitive fluxes, this study compares net ecosystem productivity at two sites on the Texas coast: the shallower (0.8&#xa0;m) <i>Thalassia testudinum</i>-dominated East Flats site in Corpus Christi Bay and the deeper (1.5&#xa0;m) <i>Halodule wrightii</i>-dominated site in the Upper Laguna Madre. The East Flats site routinely experienced supersaturated conditions leading to high rates of ebullition that tripled the rate of net ecosystem productivity compared to estimates based on dissolved oxygen fluxes alone. Photosynthetic activity at the Upper Laguna Madre site was constrained by light availability due to increased water depth. Lower rates of ebullition were observed, resulting in a minimal contribution to net ecosystem productivity. Comparison of acoustical effects from the two species considered in this study found peak transmission loss due to photosynthetic bubble production from <i>T. testudinum</i> occurred at a lower acoustic frequency (10&#xa0;kHz) compared to <i>H. wrightii</i> (40&#xa0;kHz).</p>

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Acoustic Monitoring of Two Seagrass Meadows Reveals Differences in Oxygen Ebullition and Biomass

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Megan S. Ballard,
  • Kyle A. Capistrant-Fossa,
  • Kevin M. Lee,
  • Andrew R. McNeese,
  • Colby W. Cushing,
  • Robert T. Taylor,
  • Thomas S. Jerome,
  • Kenneth H. Dunton,
  • Preston S. Wilson

摘要

Seagrasses rank among the most productive organisms on Earth due to their exceptionally high rates of photosynthesis. Long-term measurements of net ecosystem productivity are essential for assessing ecosystem health and evaluating the carbon sequestration potential of seagrass meadows. Oxygen ebullition constitutes a significant, though frequently neglected, component of net ecosystem productivity in aquatic systems. Using acoustic methods to quantify the contribution from ebullitive fluxes, this study compares net ecosystem productivity at two sites on the Texas coast: the shallower (0.8 m) Thalassia testudinum-dominated East Flats site in Corpus Christi Bay and the deeper (1.5 m) Halodule wrightii-dominated site in the Upper Laguna Madre. The East Flats site routinely experienced supersaturated conditions leading to high rates of ebullition that tripled the rate of net ecosystem productivity compared to estimates based on dissolved oxygen fluxes alone. Photosynthetic activity at the Upper Laguna Madre site was constrained by light availability due to increased water depth. Lower rates of ebullition were observed, resulting in a minimal contribution to net ecosystem productivity. Comparison of acoustical effects from the two species considered in this study found peak transmission loss due to photosynthetic bubble production from T. testudinum occurred at a lower acoustic frequency (10 kHz) compared to H. wrightii (40 kHz).