Environment drives physiological variability in the cold seep mussel Bathymodiolus childressi
Environment drives physiological variability in the cold seep mussel Bathymodiolus childressi
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DOI：
10.4319/lo.2004.49.3.0706
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发表时间：
2004-05-01
影响因子：
4.5
通讯作者：
Fisher, CR
中科院分区：
文献类型：
--
作者：
Bergquist, DC;Fleckenstein, C;Fisher, CR
有机体对环境变化的反应能力取决于其短期的生理可塑性和基因构成的限制。在热液喷口和冷渗漏，共生动物的空间变化的生理特征通常被认为反映了对零星和动态的化学环境的短期生理适应。然而，这些空间可变的反应在多大程度上代表了居住在不同环境中的动物特有的固定特征(例如可能产生于遗传分化)还没有得到测试。渗水贻贝Bathymonolus Chilressi的大部分营养依赖于甲烷营养细菌，并生活在一系列环境中，在这些环境中，它表现出不同的生长和身体状况。在这项研究中，我们首先通过测量位于四个不同地理位置的12个贻贝床中的溶解气体浓度和贻贝的身体状况，来研究儿童双胞藻的多尺度环境和生理变异性。以盐水为主的渗漏往往具有较高的甲烷和硫化物浓度，并且寄主贻贝的身体条件比以石油为主的地点更好。然后，通过两个移植实验，我们评估了当地环境条件或种群效应是否决定了所观察到的童鱼生长和身体状况的差异。在所有情况下，移植到新地点的贻贝都获得或几乎获得了宿主种群的特征，说明了环境在决定常驻贻贝的生理特征方面的主要作用。然而，来自不同地点的贻贝有时对同一环境的反应不同，这表明与种群相关的效应也在化学合成动物生理学观察到的空间差异中发挥了作用。
The ability of an organism to respond to changes in its environment depends upon its short-term physiological plasticity and the constraints of its genetic makeup. At hydrothermal vents and cold seeps, the spatially variable physiological characteristics of symbiont-bearing animals are often assumed to reflect short-term physiological adjustments to a patchy and dynamic chemical environment. However, the extent to which these spatially variable responses represent fixed characteristics unique to animals inhabiting the different environments (such as might arise from genetic differentiation) has not been tested. The seep mussel Bathymodiolus childressi depends upon methanotrophic bacteria for the bulk of its nutrition and inhabits a range of environments where it displays varying growth and body condition. In this study, we first investigated the multiscale environmental and physiological variability of B. childressi by measuring dissolved gas concentrations and mussel body condition in 12 mussel beds at four geographically distinct sites. Brine-dominated seeps tended to have higher methane and sulfide concentrations and host mussels of better body condition than petroleum-dominated sites. Then, using two transplant experiments, we evaluated whether local environmental conditions or stock effects determined the observed differences in growth and body condition of B. childressi. In all cases, mussels transplanted to new sites acquired or nearly acquired the characteristics of their host population, illustrating the primary role of the environment in determining the physiological characteristics of resident mussels. However, mussels from different sites sometimes responded differently to the same environment, suggesting stock-related effects also play a role in the spatial variation observed in the physiology of chemosynthetic fauna.