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首页> 外文期刊>Estuarine Coastal and Shelf Science >Does seasonal proliferation of Enteromorpha sp. affect the annual benthic metabolism of a small macrotidal estuary? (Roscoff Aber Bay, France)
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Does seasonal proliferation of Enteromorpha sp. affect the annual benthic metabolism of a small macrotidal estuary? (Roscoff Aber Bay, France)

机译：请问Enteromorpha sp。的季节性增生。影响小潮汐河口的底栖生物新陈代谢？ （法国罗斯科夫阿伯湾）

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摘要

Proliferation of fast growing ephemeral macroalgae may occur in intertidal environments and potentially affect the annual gross (GPP_a) and net (NPP_a) primary production of the system. Seasonal macroalgal proliferation was studied in situ in the Roscoff Aber bay and its influence on the annual benthic metabolism was investigated during low tide. CO_2 exchanges at the air-sediment interface were regularly measured within a benthic chamber in order to calculate in situ net (NPP), gross (GPP) primary production and benthic community respiration (BCR). These measurements were assessed on bare sediments at 3 representative sampling sites and in an additional sampling site regularly affected by macroalgae deposit. On bare sediments, under optimal irradiance daily GPP and NPP exhibited fortnightly fluctuations. Annual net primary production (NPP_a) was net autotrophic at the coarsest sites (up to 16 gC m~(-2) y~(-1)) and net heterotrophic at the muddiest station (up to -22 gC m~(-2) y~(-1)). On macroalgal mats GPP and BCR increased respectively from 3 to 10 and 3 to 20 times compared to bare sediments. This indicated that, at an hourly scale, the impact of macroalgae deposit on benthic metabolism was very significant. However, at the annual scale, macroalgae deposit and sediment microalgae respectively accounted for 12% and 88% of the annual net benthic primary production indicating that macroalgae proliferation poorly affected the annual carbon budget.
机译：快速增长的临时性大藻类的增殖可能发生在潮间带环境中，并可能影响系统的年度总产量（GPP_a）和净产量（NPP_a）。在Roscoff Aber海湾原位研究了季节性大型藻类增殖，并在退潮期间研究了其对年度底栖生物代谢的影响。在底栖室内定期测量空气-沉积物界面的CO_2交换量，以计算原位网（NPP），总产量（GPP）初级产量和底栖生物群落呼吸（BCR）。这些测量是在3个代表性采样点的裸露沉积物上以及在经常受到大型藻类沉积物影响的其他采样点上评估的。在裸露的沉积物上，在最佳辐照度下，每日GPP和NPP每两周出现一次波动。在最粗糙的地区（最高16 gC m〜（-2）y〜（-1））的年净初级生产力（NPP_a）是自养的，而在最泥泞的站点（最高-22 gC m〜（-2）的年净初级养分）y〜（-1））。与裸露的沉积物相比，在大型藻类垫上，GPP和BCR分别增加了3到10倍和3到20倍。这表明，在每小时的规模上，大型藻类沉积物对底栖生物代谢的影响非常显着。然而，在年尺度上，大型藻类沉积物和沉积物微藻类分别占每年底栖初级净产量的12％和88％，这表明大型藻类的扩散对年度碳预算的影响很小。

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