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首页> 美国政府科技报告 >Role of Endosymbiotic Bacteria in the Nutrition of 'Solemya velum': Evidence from a Stable Isotope Analysis of Endosymbionts and Host
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Role of Endosymbiotic Bacteria in the Nutrition of 'Solemya velum': Evidence from a Stable Isotope Analysis of Endosymbionts and Host

机译：内共生细菌在'solemya velum'营养中的作用：来自内共生体和寄主的稳定同位素分析的证据

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Carbon, nitrogen and sulfur stable isotope compositions were investigated in tissues of the protobranch bivalve Solemya velum. This species is known to harbor endosymbiotic chemoautotrophic bacteria. C and N isotope values were also examined in an enriched bacterial fraction, separated from intact gills by differential centrifugation. The bacterial fraction and host tissues had similar delta carbon13 values, suggesting that endosymbiotic bacteria provide as much as 98% of the carbon requirements of S. velum. The delta nitrogen 15 values of both S. velum and the endosymbionts were comparable and considerably lower than those of bivalve controls that do not harbor endosymbionts. Uptake of pore-water ammonium by the endosymbionts and subsequent translocation of nitrogenous compounds to the host may account for the low delta nitrogen 15 of S. velum. In this context, the symbionts may provide 100% of the host nitrogen. The delta sulfur 34 values of S. velum suggest the use of biogenically produced delta sulfur 34 as a source of S. The stable isotope ratios of sulfur and nitrogen are among the lowest reported for animal tissues. This study attempts to estimate the nutritional significance of bacterial endosymbionts by analyzing the stable isotope ratios of both bacteria and hot tissue. Keywords: Mollusca, Reprints. (AW)

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