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Monitoring Seagrass Ecosystems: Insights from the eFOCE Project (2013)

The eFOCE seminar presentations highlighted the findings of several experimental designs focusing on the impact of physical disturbances on seagrass ecosystems, specifically Posidonia oceanica. Results covered various incubation methods assessing production, respiration, and calcification rates. Key metrics like shoot density, leaf blade length, and biomass were monitored, revealing significant patterns in community dynamics and health. The use of Shiny for real-time data visualization facilitated an understanding of these complex interactions, paving the way for future research and improved conservation actions.

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Monitoring Seagrass Ecosystems: Insights from the eFOCE Project (2013)

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  1. Preliminary Results T. Erin Cox xFOCE seminar 19 November 2013

  2. Installation in May 1m Control 2m Reference Experiment Reference = R Control = C Experiment = E Reference = R Control = C Experiment = E

  3. Shiny used to monitor sensor data http://shiny.obs-vlfr.fr/efoce/datavis/ Developed by Jean-Pierre & Alice Webb with input from eFOCE members

  4. Logistics of Sampling

  5. P. oceanica abundance & density Example- Shoot density (mean ±SE) Reference = R Control = C Experiment = E

  6. P. oceanica shoot variables Example- Leaf blade length (mean ±SE) Reference = R Control = C Experiment = E

  7. P. oceanica biomass Relationship can be used to estimate biomass in chambers or plot Reference = R Control = C Experiment = E

  8. Incubations • We performed 3 types of incubations • 1. Whole Community – entire chamber incubated • 2. Seagrass – shoot enclosed • 3. Sediment – sediment with rhizomes enclosed • Changes in O2, Dissolved Inorganic Carbon, & Total Alkalinity were measured • To determine impacts to production, respiration, and calcification rates

  9. Tested many designs 3 incubation bags per chamber or plot 4 hrs light & 8 hrs darkness Collected shoot to express as dry weight Seagrass Shoot Incubations

  10. Sediment Incubations Tested many designs 1 fixed location per chamber or plot, over 3 days (n = 3) 24 hrs incubation

  11. Reference = R Control = C Experiment = E Variable Net Production Seagrass Sediment n = 1 – 3 (mean ±SE) Treatments x Month

  12. Whole community incubations Photosynthesis vs Irradiance curves

  13. Pulse Amplitude Modulation (PAM)Ability to Harvest Light Energy in P.oceanica n = 5 – 6 (mean ±SE) Reference = R Control = C Experiment = E

  14. Rapid Light Curve Parameters n = 5 – 6 (mean ±SE) Reference = R Control = C Experiment = E

  15. Other data collection • Sediment for • Diversity of microbes • Pigments • Mineralogy • Community of Foraminifera • C/N content isotopic ratios • Seagrass for • Calcified Epiphyte Mass • Epiphyte community abundance & diversity • Phenolics • DMSP • C/N content & isotopic ratios • Benthic profiler • Settlement & Recruitment Tiles

  16. Relocated Sites in November • 5 months of data collection • Repeated physical disturbance from sampling & installing electronics • Intense & repeated collections • Site no longer representative of the meadow

  17. Future Actions • Eliminate all nets • Dive tanks no longer sit on benthos • Eliminate the sediment & seagrass incubations • Reduce the collection (# & frequency) of leaves & sediment

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