کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9448828 | 1305958 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Light-dependence of the metabolic balance of a highly productive Philippine seagrass community
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Light-dependence of the metabolic balance of a highly productive Philippine seagrass community Light-dependence of the metabolic balance of a highly productive Philippine seagrass community](/preview/png/9448828.png)
چکیده انگلیسی
Seagrass meadows are important primary producers in SE-Asia coastal areas that are increasingly threatened by human activities resulting in a deterioration of the underwater light environment. The resilience of seagrass meadows to decreasing light availability should be approached in an integrative manner, because they shelter complex communities of primary and secondary producers. The aim of this study was to measure the in situ metabolism of a seagrass community under different levels of light availability following changes in the water column dissolved oxygen (DO) and dissolved inorganic carbon (DIC), the sediment redox potential and seagrass production. Net community production (NCP) and respiration were measured along two diel cycles to produce a balance of NCP under different light treatments. On a daily basis, at full irradiance, the community metabolism presented a net production which was close to zero, with values of â7.75 to 16.6 mmol O2 mâ2 dayâ1 for DO, and â56.8 to 22.7 mmol C mâ2 dayâ1 for DIC in the first and second incubation runs, respectively. Compensation irradiance for the NCP was thus found to be close to 80% of the present light availability. Shading resulted in a general decrease in the sediment redox potential, while the initial redox potential had not recovered 6 days after exposure to full sunlight. This community appears to be in a fragile equilibrium with the environment, and any minor decrease in the water transparency would lead to a shift from an autotrophic to a heterotrophic system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Experimental Marine Biology and Ecology - Volume 316, Issue 1, 9 March 2005, Pages 55-67
Journal: Journal of Experimental Marine Biology and Ecology - Volume 316, Issue 1, 9 March 2005, Pages 55-67
نویسندگان
E. Gacia, H. Kennedy, C.M. Duarte, J. Terrados, N. Marbà , S. Papadimitriou, M. Fortes,