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Responses of three tropical seagrass species to CO2 enrichment

机译：三种热带海草种类对CO2富集的响应

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Increased atmospheric carbon dioxide leads to ocean acidification and carbon dioxide (CO2) enrichment of seawater. Given the important ecological functions of seagrass meadows, understanding their responses to CO2 will be critical for the management of coastal ecosystems. This study examined the physiological responses of three tropical seagrasses to a range of seawater pCO(2) levels in a laboratory. Cymodocea serrulata, Halodule uninervis and Thalassia hemprichii were exposed to four different pCO(2) treatments (442-1204 mu atm) for 2 weeks, approximating the range of end-of-century emission scenarios. Photosynthetic responses were quantified using optode-based oxygen flux measurements. Across all three species, net productivity and energetic surplus (P (G):R) significantly increased with a rise in pCO(2) (linear models, P < 0.05). Photosynthesis-irradiance curve-derived photosynthetic parameters-maximum photosynthetic rates (P (max)) and efficiency (alpha)-also increased as pCO(2) increased (linear models, P < 0.05). The response for productivity measures was similar across species, i.e. similar slopes in linear models. A decrease in compensation light requirement (E (c)) with increasing pCO(2) was evident in C. serrulata and H. uninervis, but not in T. hemprichii. Despite higher productivity with pCO(2) enrichment, leaf growth rates in C. serrulata did not increase, while those in H. uninervis and T. hemprichii significantly increased with increasing pCO(2) levels. While seagrasses can be carbon-limited and productivity can respond positively to CO2 enrichment, varying carbon allocation strategies amongst species suggest differential growth response between species. Thus, future increase in seawater CO2 concentration may lead to an overall increase in seagrass biomass and productivity, as well as community changes in seagrass meadows.
机译：大气中二氧化碳的增加会导致海洋酸化和海水中二氧化碳（CO2）的富集。鉴于海草草甸的重要生态功能，了解它们对二氧化碳的反应对于沿海生态系统的管理至关重要。这项研究在实验室中检查了三种热带海草对一系列海水pCO（2）的生理反应。 Sermodocea serrulata，Halodule uninervis和Thalassia hemprichii暴露于四种不同的pCO（2）处理（442-1204μatm），历时2周，接近世纪末排放情景的范围。使用基于光电二极管的氧气通量测量来量化光合作用响应。在所有这三个物种中，净生产力和能量过剩（P（G）：R）随着pCO（2）的增加而显着增加（线性模型，P <0.05）。随着pCO（2）的增加，光合作用-辐照度曲线衍生的光合参数-最大光合速率（P（max））和效率（α）也增加（线性模型，P <0.05）。生产力度量的响应在不同物种之间相似，即线性模型中的相似斜率。随着pCO（2）的增加，补偿光需求量（E（c））的降低在serrulata和H. unervis中很明显，而在T. hemprichii中却没有。尽管利用pCO（2）富集可以提高生产力，但ser。c。serrulata的叶片生长速率并未提高，而uninervis和T. hemprichii的叶片生长速率却随着pCO（2）含量的增加而显着提高。虽然海草可能受到碳的限制，而生产力却可以对CO2的富集做出积极的响应，但物种间不同的碳分配策略表明物种之间的生长反应有所不同。因此，未来海水中CO2浓度的增加可能会导致海草生物量和生产力的总体增加，以及海草草甸的群落变化。

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  • 来源
    《Marine biology》 |2015年第5期|1005-1017|共13页
  • 作者

    Ow Y. X.; Collier C. J.; Uthicke S.;

  • 作者单位

    Australian Inst Marine Sci, Townsville, Qld 4810, Australia|James Cook Univ, Coll Marine & Environm Sci, Townsville, Qld 4811, Australia;

    James Cook Univ, Ctr Trop Water & Aquat Ecosyst Res TropWATER, Cairns, Qld 4870, Australia|James Cook Univ, Coll Marine & Environm Sci, Townsville, Qld 4811, Australia;

    Australian Inst Marine Sci, Townsville, Qld 4810, Australia;

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