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首页> 外文期刊>Physiological Zoology >Elevated maintenance costs in an anuran (Rana catesbeiana) exposed to a mixture of trace elements during the embryonic and early larval periods
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Elevated maintenance costs in an anuran (Rana catesbeiana) exposed to a mixture of trace elements during the embryonic and early larval periods

机译：在胚胎和幼虫早期暴露于多种微量元素的无脊椎动物（Rana catesbeiana）的维护成本升高

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摘要

We investigated the relationship between maintenance costs (standard metabolic rates, measured as 0_2 consumption at rest) in tadpoles of the bullfrog, Rana catesbeiana, and exposure to contaminants in a coal ash-polluted habitat (characterized by a variety of trace elements). We compared metabolic rates of tadpoles collected from the polluted site with those from an unpolluted reference pond. Tadpoles collected in the polluted site had 40 percent-97 percent higher standard metabolic rates than those collected from the reference pond. We also reciprocally transplanted eggs of the bullfrog between the polluted site and another reference pond and compared standard metabolic rates of tadpoles at 25 and 80 d posthatching. Metabolic rates of tadpoles raised in the polluted site were from 39 percent to 175 percent higher than those raised in a reference pond, depending on tadpole age and temperature at which metabolic rates were measured. There were no effects of site of origin of the eggs (polluted or unpolluted) on metabolic rates. Survival to hatching did not differ between sites, although survival to the end of the experiment (80 d posthatching) was lower in the polluted area than in the reference site. Surviving tadpoles were larger in wet body mass in the polluted site than in the reference pond, possibly due to lower survival in the former, but there was no relationship between survival and metabolic rate. It is clear that some feature of the polluted habitat was responsible for causing substantial elevation of standard metabolic rates of tadpoles. We hypothesize that the mixture of trace elements present in sediment and water in the polluted site was responsible for the observed physiological differences.
机译：我们调查了牛蛙，蛙蛙的t的维护成本（标准代谢率，以静止状态下的0_2消耗量衡量）与煤灰污染的生境中污染物的暴露（以多种微量元素为特征）之间的关系。我们比较了从污染地点收集的t与未污染参考塘收集的metabolic的代谢率。在污染场地收集到的standard的标准代谢率比从参比池收集到的40高40％-97％。我们还将牛蛙卵在被污染的地点和另一个参考池塘之间相互移植，并比较了孵化后25和80 d t的标准代谢率。在污染地点饲养的t的代谢率比在参考池塘中饲养的from的代谢率高39％至175％，这取决于t的年龄和测量代谢率的温度。鸡蛋的原产地（被污染或未被污染）对代谢率没有影响。尽管受污染地区到实验结束（孵化后80 d）的存活率低于参考地点，但各地点的孵化率没有差异。受污染的地方，存活ad的湿体重比参考池塘大，这可能是由于前者的存活率较低，但存活率和代谢率之间没有关系。显然，受污染的栖息地的某些特征导致causing的标准代谢率大大提高。我们假设污染区的沉积物和水中存在的微量元素的混合物是造成观察到的生理差异的原因。

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