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首页> 外文期刊>Journal of Comparative Physiology, B. Biochemical, Systemic, and Environmental Physiology >Analysis of cutaneous and internal gill gas exchange morphology in early larval amphibians, Pseudophryne bibronii and Crinia georgiana.
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Analysis of cutaneous and internal gill gas exchange morphology in early larval amphibians, Pseudophryne bibronii and Crinia georgiana.

机译：早期幼虫两栖动物，假性伪狂犬病和格里尼亚乔治亚州皮肤和内部internal气体交换形态的分析。

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This study uses stereological techniques to examine body, internal gill and cardiovascular morphology of two larval amphibians, Pseudophryne bibronii and Crinia georgiana, to evaluate the roles of diffusive and convective gas exchange. Gosner stage 27 specimens were prepared for light microscopy and six parallel sections of equal distance taken through the body as well as a further six through the heart and internal gills. Body, internal gill and heart volume as well as body and internal gill surface areas were determined. The harmonic mean distance across the internal gills was also measured and used to estimate oxygen diffusive conductance, DO(2). The species were of similar body size and surface area, but the heart and internal gills were larger in P. bibronii, which may represent precursors for greater growth of the species beyond stage 27. The much larger surface area of the skin compared to the internal gills in both species suggests it is the main site for gas exchange, with the gills supplementing oxygen uptake. The sparse cutaneous capillary network suggests diffusion is the main oxygen transport mechanism across the skin and directly into deeper tissues. A numerical model that simplifies larval shape, and has an internal (axial vessels) and external oxygen source, confirms that diffusion is able to maintain tissue oxygen with limited convective input.
机译：这项研究使用立体技术检查了两种幼体两栖动物假两栖两栖动物和格鲁尼亚乔治亚两栖动物的身体，内g和心血管形态，以评估扩散和对流气体交换的作用。进行了Gosner阶段的27个标本以进行光学显微镜检查，并通过身体等距离拍摄了六个平行切片，另外六个通过心脏和内g采集了平行切片。测定身体，内部g和心脏的体积以及身体和内部g的表面积。还测量了跨内g的谐波平均距离，并将其用于估计氧扩散电导DO（2）。该物种具有相似的体长和表面积，但是在毕氏假单胞菌中，心脏和内部的ill较大，这可能代表了该物种在第27阶段以后有更大的生长。与内部相比，皮肤的表面积更大这两个物种的都表明它是气体交换的主要场所，with补充了氧气的吸收。稀疏的皮肤毛细血管网络表明扩散是整个皮肤直接进入较深组织的主要氧气传输机制。简化了幼体形状并具有内部（轴向容器）和外部氧气源的数值模型，证实了扩散能够以有限的对流输入来维持组织氧气。

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