The gaseous environment of the pouch young of the Brush-tailed Possum, Trychosurus vulpecula Kerr
The gaseous environment of the pouch young of the Brush-tailed Possum, Trychosurus vulpecula Kerr
复制标题
刷尾负鼠 (Trychosurus vulpecula Kerr) 幼仔的气体环境
DOI：
10.1071/cwr9600149
复制
发表时间：
1960
影响因子：
1.9
通讯作者：
G. Dunnet
中科院分区：
文献类型：
--
作者：
S. Bailey;G. Dunnet
在对刷尾负鼠 Trichosurus vulpecula Kerr 进行生态研究的过程中，我们中的一个人 (GMD) 定期进行活体诱捕，获得了一系列动物，其中许多是育儿袋中育有幼仔的雌性。借此机会对育儿袋内以及育儿袋幼崽所接触的大气的气体成分进行了简要研究。分娩后，单个幼崽会爬向育儿袋，进入并附着在乳头上。此时，造口袋的入口被括约肌牢牢关闭，并且造口袋内容物的通风似乎很少。随后，成长中的幼崽的活动和袋口的明显松弛，为袋内物质和外部空气之间提供了相当大的直接交换。通过引入细水银塑料管来确定袋内的条件，通过该管抽取约3ml的气体样品。然后将这些样品转移到雪橇气体分析装置中测定二氧化碳和氧气。由于必须稍微打开袋子才能插入采样管，因此无法避免外部空气对样品的少量稀释；此外，许多雌性都在挣扎，因此在采样过程中使育儿袋内容物部分通风。
Regular live-trapping by one of us (GMD) during the course of an ecological study of the brush-tailed possum, Trichosurus vulpecula Kerr, provided a series of animals, many of which were females with young in the pouch. The opportunity was taken to make a brief study of the gaseous composition of the atmosphere within the pouch and to which the pouch young were exposed. After parturition the single young crawls to the pouch, enters, and attaches to a teat. At that time the entrance to the pouch is firmly closed by a sphincter muscle and there would appear to be little ventilation of the pouch contents. Later the activity of the growing young and an apparent relaxation of the mouth of the pouch provide for considerable direct exchange between the pouch contents and the outside air.The conditions within the pouch were determined by introducing a fine mercuryfilled plastic tube through which gas samples of approximately 3 ml were withdrawn. These samples were then transferred to a Sleigh gas-analysis apparatus for the determination of carbon dioxide and oxygen. It was impossible to avoid a small dilution of the sample with outside air as the pouch had to be opened slightly to insert the sampling tube; furthermore many females struggled, thus partially ventilating the pouch contents during sampling.