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首页> 外文期刊>Marine biology >Response of hydrothermal vent vestimentiferan Riftia pachyptila to differences in habitat chemistry
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Response of hydrothermal vent vestimentiferan Riftia pachyptila to differences in habitat chemistry

机译：热液喷口前卫裂谷裂变对生境化学差异的响应

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摘要

Vestimentiferan tubeworms, which rely on intracellular sulfide-oxidizing autotrophic bacteria for organic carbon, flourish at deep-sea hydrothermal vents despite the erratic nature of their habitat. To assess the degree to which differences in habitat chemistry (sulfide, pH/CO_2) might impact host and symbiont metabolic activity, Riftia pachyptila tubeworms were collected from habitats with low (H_2S ≤ 0.0001 mM) and high (up to 0.7 mM) sulfide concentrations. The elemental sulfur content of the symbiont-containing trophosome organ was lower in specimens collected from the low-sulfide site. Symbiont abundance, RubisCO activity, and trophosome carbon fixation rates were not significantly different for individuals collected from low- versus high-sulfide habi tats. Carbonic anhydrase activities were higher in the anterior gas exchange organs of R. pachyptila from the low-sulfide habitat. Despite large differences in habitat chemistry, symbiont abundance and autotrophic potential were consistent, while the host appears to tailor carbonic anhydrase activity to environmental CO_2 availability.
机译：Vestimentiferan worm虫依靠细胞内硫化物氧化的自养细菌获得有机碳，尽管其栖息地具有不确定性，但仍在深海热液喷口处繁盛。为了评估栖息地化学差异（硫化物，pH / CO_2）可能影响宿主和共生体代谢活性的程度，从低（H_2S≤0.0001 mM）和高（高达0.7 mM）硫化物浓度的栖息地中收集了裂叶裂谷虫。从低硫化物位点收集的标本中含有共生体的滋养体器官的元素硫含量较低。从低硫化物和高硫化物哈比菌中收集的个体的共生菌丰度，RubisCO活性和滋养体碳固定率没有显着差异。来自低硫化物生境的R. pachyptila的前气体交换器官中的碳酸酐酶活性较高。尽管栖息地化学差异很大，共生体的丰度和自养潜力是一致的，而宿主似乎是根据环境中CO_2的可利用性调整碳酸酐酶的活性。

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  • 来源
    《Marine biology》 |2012年第2期|p.435-442|共8页
  • 作者

    Kathleen M. Scott; Amanda J. Boiler; Kimberly P. Dobrinski; Nadine Le Bris;

  • 作者单位

    Department of Integrative Biology, University of South Florida,4202 East Fowler Avenue, Tampa, FL 33620, USA;

    Department of Integrative Biology, University of South Florida,4202 East Fowler Avenue, Tampa, FL 33620, USA;

    Department of Integrative Biology, University of South Florida,4202 East Fowler Avenue, Tampa, FL 33620, USA;

    Universite Pierre et Marie Curie, Paris 6, France,Benthic EcoGeochemistry Laboratory, LECOB CNRS—UPMC,FRE 3350, Banyuls Marine Station Oceanological Observatory,66650 Banyuls Sur Mer, France;

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