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首页> 外文期刊>Marine ecology progress series >Influence of suspended oyster cultures on nitrogen regeneration in a coastal lagoon (Thau, France)
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Influence of suspended oyster cultures on nitrogen regeneration in a coastal lagoon (Thau, France)

机译：牡蛎养殖悬浮物对沿海泻湖中氮的再生的影响（法国索尔）

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The present study was designed to quantify the potential influence of oyster cultures (Crassostrea gigas, Thunberg) on dissolved inorganic nitrogen (DIN) renewal in a shallow coastal lagoon (Thau, France), where nitrogen is the factor limiting primary production. The approach was based on a comparative in situ analysis of the seasonal patterns of nitrogenous nutrient exchanges at both the water sediment and oyster cultures water interfaces. The experiments were performed at a station under the influence of oyster cultures (UC) compared with benthic exchanges in a station outside their direct influence (OC) which was used as the reference site for benthic fluxes. In contrast to what it is usually reported for shallow ecosystems, I found evidence of a key influence of sus pended oyster culture units (OCU) on the regeneration in the water column of nitrogen available to the phytoplankton, with benthic remineralisation being only of secondary importance. The results also showed that the greatest impact of oyster cultures was on DIN renewal (e.g. nitrogen transformation) in the water column, not on particulate organic nitrogen transfer to the sediment. In the sector studied, it also appeared that nitrogen recycling by both sediments and OCU could satisfy the nitrogen reguirements of the primary producers except in summer when other internal nitrogen sources were necessary. Conversely, during most seasons, pelagic primary production could not meet the demand for particulate organic nitrogen of the cultured assemblages (oysters and epibiota). This emphasises the importance to the diet of cultured assemblages of other nitrogen sources such as heterotrophic populations of bacteria, cillates or flagellates.
机译：本研究旨在量化牡蛎养殖（Crassostrea gigas，Thunberg）对浅海沿海泻湖（Thau，法国）中溶解性无机氮（DIN）更新的潜在影响，其中氮是限制初级生产的因素。该方法基于对水沉积物和牡蛎养殖水界面的氮素养分交换的季节性模式的比较原位分析。与在其直接影响（OC）以外的底栖动物交易所（底栖生物通量的参考地点）相比，在牡蛎养殖（UC）的影响下在一个站点进行了实验。与通常针对浅层生态系统的报道相反，我发现有证据表明，牡蛎悬浮养殖单元（OCU）对浮游植物可获得的氮在水柱中的再生具有关键影响，而底栖再矿化仅次要。结果还表明，牡蛎养殖的最大影响在于水柱中DIN的更新（例如氮转化），而不是颗粒状有机氮转移到沉积物中。在所研究的部门中，除夏季需要其他内部氮源外，似乎沉积物和OCU的氮循环都可以满足初级生产者的氮需求。相反，在大多数季节，中上层初级生产不能满足对养殖组合（牡蛎和附生菌）颗粒有机氮的需求。这强调了饮食中其他氮源（例如细菌，ill鳞虫或鞭毛的异养种群）的组合饮食的重要性。

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