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首页> 外文期刊>Marine ecology >Adaptive variability to low-pH river discharges in Acartia tonsa and stress responses to high PCO2 conditions
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Adaptive variability to low-pH river discharges in Acartia tonsa and stress responses to high PCO2 conditions

机译：A螨低pH值河水的适应性变化和对高PCO2条件的胁迫响应

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摘要

Environmental transitions leading to spatial physical–chemical gradients are of ecological and evolutionary interest because they are able to induce variations in phenotypic plasticity. Thus, the adaptive variability to low-pH river discharges may drive divergent stress responses [ingestion rates (IR) and expression of stress-related genes such as Heat shock protein 70 (Hsp70) and Ferritin] in the neritic copepod Acartia tonsa facing changes in the marine chemistry associated to ocean acidification (OA). These responses were tested in copepod populations inhabiting two environments with contrasting carbonate system parameters (an estuarine versus coastal area) in the Southern Pacific Ocean, and assessing an insitu and 96-h experimental incubation under conditions of high pressure of CO2 (PCO2 1200ppm). Adaptive variability was a determining factor in driving variability of copepods' responses. Thus, the food-rich but colder and corrosive estuary induced a traits trade-off expressed as depressed IR under insitu conditions. However, this experience allowed these copepods to tolerate further exposure to high PCO2 levels better, as their IRs were on average 43% higher thanthose of the coastal individuals. Indeed, expression of both the Hsp70 and Ferritin genes in coastal copepods was significantly higher after acclimation to high PCO2 conditions. Along with other recent evidence, our findings confirm that adaptation to local fluctuations in seawater pH seems to play a significant role in the response of planktonic populations to OA-associated conditions. Facing the environmental threat represented by the inter-play between multiple drivers of climate change, this biological feature should be examined in detail asa potential tool for risk mitigation policies in coastal management arrangements.
机译：导致空间物理化学梯度的环境转变具有生态和进化意义，因为它们能够引起表型可塑性的变化。因此，低pH值河水流量的适应性变化可能会驱动面临变化的co足co足纲A足螨的变化胁迫反应[摄入率（IR）以及与胁迫相关的基因如热休克蛋白70（Hsp70）和铁蛋白的表达]。与海洋酸化（OA）相关的海洋化学。这些反应是在co足类种群中进行测试的，该种群在南太平洋的两种碳酸盐系统参数（河口与沿海地区）形成对比的环境中生活，并评估了在高压二氧化碳（PCO2 1200ppm）条件下的原位和96小时实验孵育。适应性变异性是驱动pe足类动物反应的变异性的决定性因素。因此，富含食物但较冷且具有腐蚀性的河口引起了性状折衷，表现为原位条件下IR降低。但是，这种经验使这些co足类动物能够更好地耐受进一步暴露于高PCO2水平，因为它们的IR比沿海个体平均高43％。确实，在适应高PCO2条件后，沿海co足类中Hsp70和Ferritin基因的表达均显着较高。连同其他近期证据，我们的发现证实，适应海水pH的局部波动似乎在浮游生物种群对OA相关条件的响应中起着重要作用。面对气候变化的多种驱动因素之间相互影响所代表的环境威胁，应详细研究这一生物学特征，将其作为沿海管理安排中减轻风险政策的潜在工具。

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  • 来源
    《Marine ecology》 |2016年第1期|215-226|共12页
  • 作者

    Aguilera Victor M.; Vargas Cristian A.; Lardies Marco A.; Poupin María J.;

  • 作者单位

    Universidad de Antofagasta Instituto de Ciencias Naturales Alexander von Humboldt Antofagasta Chile;

    Universidad de Concepción Millenium Institute of Oceanography Concepción Chile;

    Universidad de Concepción Millenium Institute of Oceanography Concepción Chile;

    Department of Aquatic Systems Faculty of Environmental Sciences Environmental Sciences Center EULA Chile Universidad de Concepción Aquatic Ecosystem Functioning Lab (LAFE) Concepción Chile;

    Universidad de Concepción Center for the Study of Multiple‐drivers on Marine Socio‐Ecological Systems (MUSELS) Concepción Chile;

    Universidad de Concepción Center for the Study of Multiple‐drivers on Marine Socio‐Ecological Systems (MUSELS) Concepción Chile;

    Facultad de Artes Liberales Laboratorio de Bioingeniería Facultad de Ingeniería y Ciencias Universidad Adolfo Ibáñez Departamento de Ciencias Santiago Chile;

    Facultad de Ingeniería y Ciencias Center of Applied Ecology and Sustainability (CAPES) Universidad Adolfo Ibañez Laboratorio de Bioingeniería Santiago Chile;

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  • 正文语种 eng
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  • 关键词

    Adaptive variability; copepods; low pH; ocean acidification; river discharges;

    机译：适应性变化;足足;低pH;海洋酸化;河水排放;

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