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Acid-base regulation in the Dungeness crab (Metacarcinus magister)

机译：太平洋大蟹（Metacarcinus magister）中的酸碱调节

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摘要

Homeostatic regulation allows organisms to secure basic physiological processes in a varying environment. To counteract fluctuations in ambient carbonate system speciation due to elevated seawater pCO_2 (hyper-capnia), many aquatic crustaceans excrete/accumulate acid-base equivalents through their gills; however, not much is known about the role of ammonia in this response. The present study investigated the effects of hypercapnia on acid-base and ammonia regulation in the Dungeness crab, Metacarcinus magister on the whole animal and isolated gill levels. Hemolymph pCO_2 and [HCO_3~-] increased in M. magister acclimated to elevated pCO_2 (330 Pa), while pH remained stable. Additionally, hemolymph [Na~+], [Ca~(2+)], and [SO_4~(2-)] were significantly increased. When challenged with varying pH during gill perfusion, the pH of the artificial hemolymph remained relatively unchanged. Overall, ammonia production and excretion, as well as oxygen consumption, were reduced in crabs acclimated to elevated pCO_2, demonstrating that either (amino acid) oxidation is reduced in response to this particular stress, or nitrogenous wastes are excreted in an alternative form.
机译：稳态调节允许生物体在变化的环境中确保基本的生理过程。为了抵消由于海水pCO_2升高（高碳酸血症）引起的周围碳酸盐系统形态的波动，许多水生甲壳类动物会通过其their分泌或积累酸碱当量。然而，关于氨在该反应中的作用知之甚少。本研究调查了高碳酸血症对Dungeness蟹，Metacarcinus magister蟹的酸碱和氨调节对整个动物和孤立g的影响。适应于升高的pCO_2（330 Pa）的马格里希氏菌的淋巴pCO_2和[HCO_3〜-]增加，而pH值保持稳定。此外，血淋巴[Na〜+]，[Ca〜（2+）]和[SO_4〜（2-）]显​​着增加。当在g灌流过程中受到不同pH值的挑战时，人工淋巴的pH值保持相对不变。总的来说，适应pCO_2升高的螃蟹的氨产生和排泄以及氧气消耗减少了，这表明（氨基酸）氧化响应这种特殊的压力而减少，或者含氮废物以其他形式排泄。

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  • 来源
    《Marine biology》 |2014年第5期|1179-1193|共15页
  • 作者

    Stephanie Hans; Sandra Fehsenfeld; Jason R. Treberg; Dirk Weihrauch;

  • 作者单位

    Department of Biological Sciences, University of Manitoba,190 Dysart Road, Winnipeg, MB R3T2N2, Canada;

    Department of Biological Sciences, University of Manitoba,190 Dysart Road, Winnipeg, MB R3T2N2, Canada;

    Department of Biological Sciences, University of Manitoba,190 Dysart Road, Winnipeg, MB R3T2N2, Canada,Department of Human Nutritional Sciences, University of Manitoba, 190 Dysart Road, Winnipeg, MB R3T2N2, Canada;

    Department of Biological Sciences, University of Manitoba,190 Dysart Road, Winnipeg, MB R3T2N2, Canada;

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