Abstract
In situ measurements of sound speed and attenuation at 50 kHz were conducted in a Thalassia testudium meadow. Measurements were obtained at discrete depths in the water column, in the seagrass canopy, and in the sediment beneath the seagrass. Measurements were also obtained in bare sediment located a few meters away. Sediment biomass abundance was measured from cores collected at each site. Even though the measurements were obtained in the dormant season (winter), significant differences in sound speed and attenuation were observed in the sediment beneath the seagrass bed compared to the bare sediment.
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