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首页> 外文期刊>Estuarine Coastal and Shelf Science >Effects of short-term changes in sediment temperature on the photosynthesis of two intertidal microphytobenthos communities
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Effects of short-term changes in sediment temperature on the photosynthesis of two intertidal microphytobenthos communities

机译：沉积物温度的短期变化对两个潮间带微底栖动物群落光合作用的影响

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摘要

Intertidal microphytobenthos (MPB) has been found to maintain high productivity rates despite the variability in various key environmental parameters, namely rapid temperature changes during emersion. The effects of short-term (30 min and 2 h) changes in temperature (15, 25, 35 and 42 °C) on the photosynthetic activity of two intertidal MPB communities (Trancao and Alcochete) of the Tagus estuary were studied using imaging pulse amplitude modulated (Imaging-PAM) fluorometry. MPB communities differed in species composition and size-class distribution: Tranc3o was dominated by diatoms of the size-class 100-250 urn3, particularly Navicula cf. phyllepta, whereas Alcochete had higher relative abundances for size-class 250-1000 urn3, dominated by a mixture of diatom species of the genera Navicula, Thalassiosira and Gyrosigma. The Trancao MPB community had higher photosynthetic capacity (higher ETR_(max)), was photoacclimated to higher irradiances (higher E_k) and had lower efficiency at limiting irradiances (lower α). The different taxonomic composition and size-class distribution could explain the observed results, as small cells are usually more active due to larger surface to volume ratios. Photosynthetic capacities of the two studied MPB communities increased with temperature until 35 °C. Photosynthetic efficiencies were not affected by temperature in the 15—35 °C range and both ETR_(max) and α decreased at the extreme temperature of 42 °C. MPB communities were able to increase photosynthetic capacity and productivity under transient exposure to high sediment temperatures, similar to that observed during summer midday low tides.
机译：尽管各种关键环境参数（即发芽过程中温度的快速变化）存在差异，但潮间带微底栖动物（MPB）已被发现可以保持较高的生产率。使用成像脉冲研究了温度（15、25、35和42°C）的短期（30分钟和2小时）温度变化对塔霍斯河口两个潮间MPB群落（Trancao和Alcochete）光合作用的影响。调幅（Imaging-PAM）荧光法。 MPB群落的物种组成和大小类别分布各不相同：Tranc3o的大小等级为100-250 urn3硅藻，尤其是Naviculacf。 phyllepta，而Alcochete的250-1000缸级3的相对丰度较高，主要由Navicula，Thalasiosira和Gyrosigma属的硅藻物种组成。 Trancao MPB群落具有较高的光合能力（较高的ETR_（max）），被光适应较高的辐照度（较高的E_k），并且在限制辐照度方面效率较低（α较低）。不同的生物分类组成和大小分类分布可以解释观察到的结果，因为小细胞通常由于较大的表面积与体积之比而更具活性。直到35°C，两个研究的MPB群落的光合能力均随温度增加。在15-35°C的温度范围内，光合效率不受温度的影响，并且在42°C的极端温度下ETR_（max）和α均降低。在短暂暴露于高沉积温度的情况下，MPB群落能够提高光合能力和生产力，这与夏季中午退潮时观察到的相似。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第1期|112-118|共7页
  • 作者

    Sonia Vieira; Lourenco Ribeiro; Jorge Marques da Silva; Paulo Cartaxana;

  • 作者单位

    Centra de Oceanografia, Faculdade de Ciencias da Universidade de Lisboa, 1749-016 Lisboa, Portugal ,Centra de Biodiversidade, Cenomica Integrativa e Funcional (BioFIG), Faculdade de Ciencias da Universidade de Lisboa, 1749-016 Lisboa, Portugal;

    Centra de Oceanografia, Faculdade de Ciencias da Universidade de Lisboa, 1749-016 Lisboa, Portugal;

    Centra de Biodiversidade, Cenomica Integrativa e Funcional (BioFIG), Faculdade de Ciencias da Universidade de Lisboa, 1749-016 Lisboa, Portugal ,Departamento de Biologia Vegetal, Faculdade de Ciencias da Universidade de Lisboa, 1749-016 Lisboa, Portugal;

    Centra de Oceanografia, Faculdade de Ciencias da Universidade de Lisboa, 1749-016 Lisboa, Portugal;

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  • 正文语种 eng
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  • 关键词

    microphytobenthos; chlorophyll fluorescence; photosynthesis; diatoms; migration; Tagus estuary;

    机译：微型底栖动物叶绿素荧光光合作用;硅藻移民;塔霍河口;

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