Growth dynamics of the seagrass, Zostera marina were examined at the two stations (Myungju and Dagu) in Jindong Bay on the southern coast of Korea. Eelgrass leaf productivities, underwater irradiance, water temperature, dissolved inorganic nitrogen (DIN) in water column and sediments, and tissue car...
Growth dynamics of the seagrass, Zostera marina were examined at the two stations (Myungju and Dagu) in Jindong Bay on the southern coast of Korea. Eelgrass leaf productivities, underwater irradiance, water temperature, dissolved inorganic nitrogen (DIN) in water column and sediments, and tissue carbon (C) and nitrogen (N) content were monitored monthly from March 2002 to January 2004. Underwater irradiance fluctuated highly without a clear seasonal trend, whereas water temperature showed a distinct seasonal trend at both study stations. Water column DIN concentrations were usually less than $5{\mu}M$ at both study sites. Sediment pore water $NH_4{^+}$ and $NO_3{^-}+NO_2{^-}$ concentrations were higher at the Myungju site than at the Dagu site. Eelgrass leaf productivity at both study sites exhibited a distinct seasonality, increasing during spring and decreasing during summer. Seasonal variation of eelgrass productivity was not consistent with seasonal patterns of underwater irradiance, or water temperature. Eelgrass tissue C and N content at both study sites also showed significant seasonal variations. Relationships between tissue C and N content and leaf productivities exhibited usually negative correlations at both study sites. These negative correlations implied that the growth of Z. marina at the study sites was probably limited by C and N supplies during the high growth periods.
Growth dynamics of the seagrass, Zostera marina were examined at the two stations (Myungju and Dagu) in Jindong Bay on the southern coast of Korea. Eelgrass leaf productivities, underwater irradiance, water temperature, dissolved inorganic nitrogen (DIN) in water column and sediments, and tissue carbon (C) and nitrogen (N) content were monitored monthly from March 2002 to January 2004. Underwater irradiance fluctuated highly without a clear seasonal trend, whereas water temperature showed a distinct seasonal trend at both study stations. Water column DIN concentrations were usually less than $5{\mu}M$ at both study sites. Sediment pore water $NH_4{^+}$ and $NO_3{^-}+NO_2{^-}$ concentrations were higher at the Myungju site than at the Dagu site. Eelgrass leaf productivity at both study sites exhibited a distinct seasonality, increasing during spring and decreasing during summer. Seasonal variation of eelgrass productivity was not consistent with seasonal patterns of underwater irradiance, or water temperature. Eelgrass tissue C and N content at both study sites also showed significant seasonal variations. Relationships between tissue C and N content and leaf productivities exhibited usually negative correlations at both study sites. These negative correlations implied that the growth of Z. marina at the study sites was probably limited by C and N supplies during the high growth periods.
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가설 설정
Although seagrasses can utilize nitrogen from both the water column and sediments, reduced seagrass tissue N content has been reported during the periods of high growth (Stöcker 1980, Pirc and Wollenweber 1988, Pérez-Lloréns and Niell 1993). Thus, we hypothesized that seagrass growth is probably limited by inorganic C and N during high growing periods at the study sites.
제안 방법
Both Myungju and Dagu stations are characterized by muddy sediments with a low sand content. Eelgrass tissue C and N content, leaf productivity, and environmental factors such as underwater photon flux density (PFD), water temperature, and DIN concentrations were monitored from March 2002 to January 2004 at both study sites.
Concentrations of NO3- + NO2- were determined after passing the samples through a column containing copper coated cadmium, which reduces NO3- to NO2-. Six to ten replicate sediment samples were collected randomly, to a sediment depth of about 13 cm using a corer for measurement of sediment pore water DIN concentrations. Samples were placed on ice and frozen pending lab analysis.
대상 데이터
However, few studies have been conducted on the assessment of seagrass growth dynamics through measurements of tissue C and N content. In this study, eelgrass growth dynamics were examined in relation to coincident seasonal changes in tissue C and N content from the two study sites in Jindong Bay on the southern coast of Korea.
4. Seasonal variations in leaf productivities of Zostera marina at the two study sites in Jindong Bay from March 2002 to January 2004. Values represent means ± SE.
1. Study sites (Myungju and Dagu stations) in Jindong Bay on the southern coast of Korea.
The two study sites (Myungju and Dagu stations) were located in Jindong Bay on the southern coast of Korea (Fig. 1). This study was conducted on a monotypic meadow of Z.
1). This study was conducted on a monotypic meadow of Z. marina with an average water depth of about 2-3 m. Both Myungju and Dagu stations are characterized by muddy sediments with a low sand content.
데이터처리
, Chicago, IL, USA). Data were tested for normality and homogeneity of variance to meet the assumptions of parametric statistics. Significant differences in eelgrass tissue C and N content, and leaf productivities between sampling stations and among sampling time were tested using a two-way ANOVA.
Data were tested for normality and homogeneity of variance to meet the assumptions of parametric statistics. Significant differences in eelgrass tissue C and N content, and leaf productivities between sampling stations and among sampling time were tested using a two-way ANOVA. When a significant difference among variables was observed, the means were analyzed by a Tukey multiple comparison test to determine where the significant differences occurred.
Significant differences in eelgrass tissue C and N content, and leaf productivities between sampling stations and among sampling time were tested using a two-way ANOVA. When a significant difference among variables was observed, the means were analyzed by a Tukey multiple comparison test to determine where the significant differences occurred. Correlation analyses were used to examine the relationships between leaf productivity and tissue C and N content.
성능/효과
Therefore, seagrasses usually utilize NH4+ from both the water column and sediments as a major nitrogen source. In this study, eelgrass leaf N content at both study sites showed significant seasonal trends, increasing during summer and fall and decreasing during winter and spring. Leaf N content and leaf productivities exhibited significant (r2 = 0.
2007b). In this study, productivities of Z. marina in both study sites showed distinct seasonality, increasing during spring and decreasing during summer and fall. Although seagrass productivities have been suggested to be regulated by underwater irradiance, water temperature and nutrients availabilities, the seasonal variations of eelgrass productivities in this study sites were not consistent with seasonal patterns of these environmental factors.
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