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首页> 外文期刊>Marine biology >Allometry of gill weights, gill surface areas, and foot biomass delta(13) values of the chemoautotroph-bivalve symbiosis Solemya velum
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Allometry of gill weights, gill surface areas, and foot biomass delta(13) values of the chemoautotroph-bivalve symbiosis Solemya velum

机译：化学自营养双亲共生Solemya lum的of重量，g表面积和足生物量delta（13）值的异速测量法

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The protobranch bivalve Solemya velum Say, 1822 has large gills, which harbor chemolithoautotrophic bacteria that supply the majority of the clam's organic carbon. A substantial portion of the CO2, O-2, H2S, and other nutrients necessary for symbiont autotrophy and host heterotrophy are acquired from the environment through the gills, whose large size may be necessary to facilitate the acquisition of sufficient O-2 from S. velum's habitat to meet the combined demands of the host and symbionts. Large gills may also result in an oversupply of CO2, which may in turn be responsible for the isotopically depleted delta(13)C values observed in S. velum biomass (-31 to -34 parts per thousand). Alternatively, gill hypertrophy may simply be an adaptation to house a large population of symbionts adjacent to their environmental source of dissolved gases and other nutrients. To better understand gill function in this symbiosis, gill weights, gill surface areas, and foot delta(13)C values were measured as a function of total weights. S. velum gill weights were found to be a substantial portion of total clam weight, averaging 38% of wet weight, compared to nonsymbiotic protobranch bivalves Yoldia limatula Say, 1831 (5%) and Nucula proxima Say, 1822 (11%). Gill weights are a smaller percentage of total weight in larger individuals; the allometric equation for gill weight (G) as a function of total weight (M) is G=0.26M(0.85). Dry weights scale similarly. Gill surface areas are immense; the average gill surface area measured was 107 cm(2) g(-1) total soft tissue wet weight, the highest value for any marine invertebrate. Gill surface area (SA) also scales with size (SA=69.8M(0.85)). When gill surface areas were calculated with respect to gill wet weights, they did not scale with size. The delta(13)C values do not scale with size either, consistent with high rates of CO2 supply at all sizes. Extraordinarily high rates of CO2 supply relative to demand are supported by a model for CO2 delivery based on Fick's law and the allometric relationship between surface areas and total weight, consistent with a role for large gill surface areas in the generation of isotopically depleted tissue delta(13)C values.
机译：1822年说的原枝双壳纲Solemya velum有大型g，其中藏有化能自养细菌，可提供蛤的大部分有机碳。共生自养和宿主异养所需的大部分CO2，O-2，H2S和其他营养物质通过through从环境中获取，ill可能需要很大的尺寸以促进从S中获取足够的O-2。 velum的栖息地，可以满足宿主和共生体的共同需求。大g也可能导致CO2的过量供应，这可能又是造成S. velum生物量中同位素减少的delta（13）C值的原因（-31至-34千分之一）。或者，g肥大可以简单地适应于容纳大量共生体，使其邻近其溶解气体和其他营养物质的环境来源。为了更好地了解这种共生中的ill功能，将g重量，surface表面积和足部δ（13）C值作为总重量的函数进行了测量。与非共生原枝双壳动物Yoldia limatula Say（1831）（5％）和Nucula proxima Say（1822）（11％）相比，沙门氏菌g的重量占蛤总重量的很大一部分，平均为湿重的38％。 larger体重在较大的个体中占总体重的百分比较小； g重量（G）与总重量（M）的函数的异速方程为G = 0.26M（0.85）。干重按比例缩放。 ill表面很大；测量的平均g表面积为107 cm（2）g（-1）的总软组织湿重，是所有海洋无脊椎动物的最高值。 ill表面积（SA）也随尺寸缩放（SA = 69.8M（0.85））。当计算g表面相对于wet湿重的表面积时，它们并没有随尺寸变化。 δ（13）C值也不随尺寸变化，这与所有尺寸的高CO2供给率一致。基于菲克定律以及表面积与总重量之间的异形关系的CO2输送模型支持了相对于需求而言极高的CO2供给速率，这与大g表面积在同位素消耗组织δ的生成中的作用一致（ 13）C值。

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