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http://dx.doi.org/10.5657/KFAS.2012.0065

Seasonal Changes in the Carbon and Nitrogen Contents of Zostera marina Populations in the Intertidal and Subtidal Zones of the Seomjin Estuary, Korea  

Kim, Jeong-Bae (Marine Environment Research Division, National Fisheries Research and Development Institute)
Park, Jung-Im (Marine Eco-Technology Institute)
Lee, Won-Chan (Marine Environment Research Division, National Fisheries Research and Development Institute)
Lee, Kun-Seop (Department of Biological Sciences, Pusan National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.45, no.1, 2012 , pp. 65-75 More about this Journal
Abstract
To study the difference in growth characteristics between intertidal and subtidal eelgrass Zostera marina populations, environmental factors and changes in tissue carbon (C) and nitrogen (N) contents in eelgrass from the lower intertidal and upper subtidal zones were surveyed monthly in the Seomjin Estuary from May 2003 to December 2004. Water temperatures, water column nutrient concentrations, sediment pore water, and ammonium and phosphate concentrations showed no significant differences between intertidal and subtidal zones. Sediment pore water nitrate+nitrite concentrations were slightly higher in the intertidal zone than in the subtidal zone. Average monthly exposure times in the intertidal and subtidal zones were $42.4{\pm}5.8h\;month^{-1}$ and $15.3{\pm}3.5h\;month^{-1}$, respectively. Eelgrass leaf N content decreased from March to August and increased from September to February in the subtidal zone, whereas these trends were not observed in the intertidal zone. Eelgrass rhizome C content increased from April to September and decreased from October to March in the subtidal zone, whereas those tendencies were not recorded in the intertidal zone. Eelgrass rhizome C:N ratios showed a strong reverse trend to leaf C:N ratios in the subtidal zone, but these tendencies were not observed in the intertidal zone. The effects of exposure appeared to cause no seasonal trend in eelgrass tissue C and N content or C:N ratios in the intertidal zone in the Seomjin Estuary.
Keywords
Seagrass; Zostera marina; Intertidal; Subtidal; Seomjin Estuary;
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