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http://dx.doi.org/10.4490/ALGAE.2008.23.1.083

Using a Digital Echosounder to Estimate Eelgrass (Zostera marina L.) Cover and Biomass in Kwangyang Bay  

Kim, Keun-Yong (Department of Oceanography, Chonnam National University)
Kim, Ju-Hyoung (Department of Oceanography, Chonnam National University)
Kim, Kwang-Young (Department of Oceanography, Chonnam National University)
Publication Information
ALGAE / v.23, no.1, 2008 , pp. 83-90 More about this Journal
Abstract
Eelgrass beds are very productive and provide nursery functions for a variety of fish and shellfish species. Management for the conservation of eelgrass beds along the Korean coasts is critical, and requires comprehensive strategies such as vegetation mapping. We suggest a mapping method to spatial distribution and quantify of eelgrass beds using a digital echosounder. Echosounding data were collected from the northeast part of Kwangyang Bay, on the south of Korea, in March, 2007. A transducer was attached to a boat equipped with a DGPS. The boat completed a transect survey scanning whole eelgrass beds of 11.7 km2 with a speed of 1.5-2 m s-1 (3-4 knot). The acoustic reflectivity of eelgrass allowed for detection and explicit measurements of canopy cover and height. The results showed that eelgrass bed was distributed in depth from 1.19 to 3.6 m (below MSL) and total dry weight biomass of 4.1 ton with a vegetation area of 4.05 km2. This technique was found to be an effective way to undertake the patch size and biomass of eelgrass over large areas as nondestructive sampling.
Keywords
acoustic reflectivity; biomass; canopy cover; digital echosounder; eelgrass beds; Kwangyang Bay; vegetation mapping;
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Times Cited By KSCI : 2  (Citation Analysis)
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