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首页> 外文期刊>Estuarine Coastal and Shelf Science >Accounting for the influence of temperature and location when predicting seagrass (Halophila ovalis) photosynthetic performance
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Accounting for the influence of temperature and location when predicting seagrass (Halophila ovalis) photosynthetic performance

机译：预测海草（Halophila ovalis）光合性能时的温度和位置的影响

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We show that the effect of temperature on photosynthesis of a widely distributed and ecological important seagrass species was not consistent among locations, with some evidence of acclimation to the local temperature range. This has important implications for modelling seagrass productivity and the impacts of light reduction on seagrass ecosystems. Reduced light availability is one of the main pressures negatively impacting on seagrass meadows worldwide. Our knowledge of seagrass photosynthetic characteristics is critical to predicting and managing impacts of light reducing activities but suffers from two critical information gaps: first, data is overwhelmingly derived from studies of leaf tissue and not for whole plants, and is unlikely to reflect whole plant performance under light reduction stress; and second, few studies have looked at spatial and temporal variability in photosynthetic performance of whole seagrasses. We investigated temporal and spatial variation at a range of temperatures for whole plants of Halophila ovalis, a widely distributed species, by measuring oxygen exchange of intact plants collected from four locations across a latitudinal gradient (10 degrees) at three temperatures (17 degrees C, 23 degrees C, 28 degrees C). For all locations, temperature affected all photosynthetic parameters, with some parameters (NPmax, R, I-k) showing a distinct difference between tropical and temperate locations. For example, NPmax ranged from 1.35 +/- 0.12 to 5 +/- 0.16 mg O-2. g DW-1. hr(-1) in temperate locations and from 4 +/- 0.3 to 12 +/- 0.68 mg O-2. g DW-1. hr(-1) in the tropical location. However, the effect of temperature on photosynthesis was not consistent among locations, and often the rate of photosynthesis was greatest at temperatures approaching the mean month maximum temperature for the location, suggestive of acclimation. Time of year also affected photosynthetic rates and how temperature influenced those rates. We conclude that the application of P-I parameters to model, predict or manage the effect of light reduction of H. ovalis, and likely other seagrass species, may require site- and time-specific knowledge of P-I relationships.
机译：我们表明，温度对广泛分布的生态和生态重要海草物种的光合作用的影响在地点之间并不一致，有一些适应局部温度范围的证据。这对海草生产力建模和轻微减少对海草生态系统的影响具有重要意义。降低光可用性是全世界海草草甸对海草草甸产生负面影响之一。我们对海草光合特性的了解对于预测和管理光还原活动的影响至关重要，但是遭受了两个关键信息差距：首先，数据绝大多数来自叶组织的研究而不是全植物，并且不太可能反映整个植物的性能在轻微的压力下;其次，很少有研究在整个海草的光合性能下看过空间和时间变化。我们通过测量三个温度（17摄氏度）（17摄氏度）（17℃， 23摄氏度，28℃）。对于所有位置，温度影响所有光合参数，具有一些参数（NPMAX，R，I-K），显示热带和温带位置之间的不同差异。例如，NPMAX范围为1.35 +/- 0.12至5 +/- 0.16 mg O-2。 g dw-1。 HR（-1）温带地点，4 +/- 0.3至12 +/- 0.68 mg O-2。 g dw-1。 HR（-1）在热带位置。然而，温度对光合作用的影响在地点之间并不一致，并且光合作用率在接近地点的平均月最高温度的温度下最大，暗示适应。一年中的时间也影响了光合速率以及温度如何影响这些速率。我们得出结论，P-I参数应用于模型，预测或管理H. Ovalis光降低和可能其他海草物种的效果，可能需要对P-I关系的现场和时间特异性知识。

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