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Warming enhances sulphide stress of Mediterranean seagrass (Posidonia oceanica)

机译：气候变暖加剧了地中海海草（Posidonia oceanica）的硫化物胁迫

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摘要

We experimentally investigated the effect of Mediterranean seawater summer warming projected for the 21st century under Intergovernmental Panel on Climate Change (IPCC) scenarios of greenhouse gas emissions on Posidonia oceanica sulphide stress. The results reveal that projected warming would enhance sulphide toxicity in P. oceanica and, hence, the risk of seagrass loss. We assessed sulphide stress of seagrasses by estimating the sulphide intrusion (F_(sulphide)hide) into leaf tissue from the sulphur isotopic signature in sediments (δ~(34)S_(srlphide)).in the water column (δ~(34)S_(srlphide)) and in P. oceanica leaves (δ~(34)S_(tissre)). Seagrasses were grown at 6 seawater temperature treatments, ranging from 26 ℃ to 32 ℃, in 3 replicated experimental mesocosms for 50 days. At the end of the experiment, the seagrass shoots in all of the treatments exhibited sulphide intrusion (F_(sulphide)> 0%), which had been negligible when the experiment started. Similarly, the leaf δ~(34)S_(tissre) was lighter at the end of the experiment than at the beginning, when seagrasses in the field were experiencing a seawater temperature of 23 ℃. F_(sulphide) linearly increased with experimental warming, while leaf δ~(34)S_(tissre) declined with increasing temperature at a rate of 0.3‰ for each centigrade degree of warming. The daily production of new leaves per shoot decreased as the sediment became more reduced. Leaf δ~(34)S_(tissre) below 20.5‰, indicative of 1% sulphide intrusion, is expected to compromise P. oceanica performance.
机译：我们通过实验研究了政府间气候变化专门委员会（IPCC）情景下温室气体排放对21世纪地中海海水夏季变暖的预测对海洋波西多尼亚硫化物胁迫的影响。结果表明，预计的变暖将增强海洋假单胞菌中的硫化物毒性，从而增加海草损失的风险。我们通过水柱（δ〜（34））中沉积物的硫同位素特征（δ〜（34）S_（srlphide））估算硫化物向叶片组织中的侵入，从而评估海草的硫化物应力。 S_（srlphide））和P. oceanica叶子（δ〜（34）S_（tissre））。在6个海水温度处理（26℃至32℃）中，海草在3个重复的实验中观中生长了50天。在实验结束时，所有处理中的海草芽均表现出硫化物侵入（F_（硫化物）> 0％），在实验开始时可以忽略不计。同样，当田间海草的海水温度为23℃时，实验结束时的叶片δ〜（34）S_（tissre）较开始时轻。随着实验温度的升高，F_（硫化物）呈线性增加，而叶片的δ〜（34）S_（tissre）随温度的升高而下降，温度每升高一摄氏度，其下降幅度为0.3‰。随着沉积物的减少，每枝新叶的日产量下降。叶片δ〜（34）S_（tissre）低于20.5‰，表明有1％的硫化物侵入，这可能会损害海洋假单胞菌的性能。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2012年第10期|p.240-247|共8页
  • 作者

    R. Garcia; M. Sanchez-Camacho; C.M. Duarte; N. Marba;

  • 作者单位

    Department of Global Change Research, IMEDEA (CSIC-UIB), Institute Mediterineo de Estudios Avanzados, C/ Miquel Marquis 21, 07190 Esporles (Islas Baleares), Spain;

    Department of Global Change Research, IMEDEA (CSIC-UIB), Institute Mediterineo de Estudios Avanzados, C/ Miquel Marquis 21, 07190 Esporles (Islas Baleares), Spain;

    Department of Global Change Research, IMEDEA (CSIC-UIB), Institute Mediterineo de Estudios Avanzados, C/ Miquel Marquis 21, 07190 Esporles (Islas Baleares), Spain,The UWA Oceans Institute, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia;

    Department of Global Change Research, IMEDEA (CSIC-UIB), Institute Mediterineo de Estudios Avanzados, C/ Miquel Marquis 21, 07190 Esporles (Islas Baleares), Spain;

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  • 正文语种 eng
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  • 关键词

    temperature; sulphur; isotopes; sediment; threshold; mesocosms;

    机译：温度;硫;同位素沉淀;阈;中观;

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