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One size fits all: stability of metabolic scaling under warming and ocean acidification in echinoderms

机译：一种尺寸适合所有人：棘皮动物在变暖和海洋酸化条件下代谢结垢的稳定性

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Responses by marine species to ocean acidification (OA) have recently been shown to be modulated by external factors including temperature, food supply and salinity. However the role of a fundamental biological parameter relevant to all organisms, that of body size, in governing responses to multiple stressors has been almost entirely overlooked. Recent consensus suggests allometric scaling of metabolism with body size differs between species, the commonly cited 'universal' mass scaling exponent (b) of ¾ representing an average of exponents that naturally vary. One model, the Metabolic-Level Boundaries hypothesis, provides a testable prediction: that b will decrease within species under increasing temperature. However, no previous studies have examined how metabolic scaling may be directly affected by OA. We acclimated a wide body-mass range of three common NE Atlantic echinoderms (the sea star Aste-rias rubens, the brittlestars Ophiothrix fragilis and Amphiura filiformis) to two levels of pCO_2 and three temperatures, and metabolic rates were determined using closed-chamber respirometry. The results show that contrary to some models these echinoderm species possess a notable degree of stability in metabolic scaling under different abiotic conditions; the mass scaling exponent (b) varied in value between species, but not within species under different conditions. Additionally, we found no effect of OA on metabolic rates in any species. These data suggest responses to abiotic stressors are not modulated by body size in these species, as reflected in the stability of the metabolic scaling relationship. Such equivalence in response across ontogenetic size ranges has important implications for the stability of ecological food webs.
机译：近来，海洋物种对海洋酸化（OA）的反应已显示受温度，食物供应和盐度等外部因素的调节。但是，与所有生物体相关的基本生物学参数（体型）在控制对多种应激源的反应中的作用几乎被完全忽略了。最近的共识表明，物种间新陈代谢的异体缩放比例随体型的不同而不同，通常引用的“通用”质量比例指数（b）为3/4，代表自然变化的指数的平均值。代谢水平边界假说是一种模型，它提供了可检验的预测：随着温度升高，物种内的b会减少。但是，以前没有研究检查过OA如何直接影响代谢垢。我们将三种常见的东北大西洋棘皮动物（海星Aste-rias rubens，脆性海蛇Ophiothrix fragilis和Amphiura filiformis）的大质量范围适应了两个pCO_2水平和三个温度，并使用闭室呼吸测定法测定了代谢率。结果表明，与某些模型相反，这些棘皮动物物种在不同的非生物条件下在代谢缩放方面具有显着的稳定性。质量缩放指数（b）的值在物种之间变化，但在不同条件下物种内部没有变化。此外，我们发现OA对任何物种的代谢率均无影响。这些数据表明在这些物种中对非生物应激源的反应不受身体大小的调节，这反映在代谢比例关系的稳定性上。这种跨越个体大小范围的等效反应对生态食物网的稳定性具有重要意义。

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  • 来源
    《Marine biology》 |2014年第9期|2131-2142|共12页
  • 作者

    Nicholas Carey; Sam Dupont; Bengt Lundve; Julia D. Sigwart;

  • 作者单位

    Marine Laboratory, Queen's University Belfast, 12-13 The Strand, Portaferry, County Down BT22 1PF, Northern Ireland, UK School of Biological Sciences, Queen's University Belfast, Lisburn Road, Belfast BT9 7BL, Northern Ireland, UK;

    Department of Marine Ecology, Sven Loven Centre for Marine Sciences, University of Gothenburg, Kristineberg, Sweden;

    Department of Marine Ecology, Sven Loven Centre for Marine Sciences, University of Gothenburg, Kristineberg, Sweden;

    Marine Laboratory, Queen's University Belfast, 12-13 The Strand, Portaferry, County Down BT22 1PF, Northern Ireland, UK School of Biological Sciences, Queen's University Belfast, Lisburn Road, Belfast BT9 7BL, Northern Ireland, UK;

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