The Nests and Nest Site Selection by Ozark Hellbenders, Cryptobranchus alleganiensis bishopi Grobman
The Nests and Nest Site Selection by Ozark Hellbenders, Cryptobranchus alleganiensis bishopi Grobman
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Ozark Hellbenders、Cryptobranchus alleganiensis bishopi Grobman 的巢穴和巢址选择
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
M. D. Tohulka
中科院分区：
文献类型：
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作者：
M. Nickerson;M. D. Tohulka
作者于1980年10月初在密苏里州欧扎克县怀特河北支流的钙质石灰岩基岩之间的裂缝中发现了两个欧扎克海龙（Cryptobranchus alleganiensis bishopi）巢穴。虽然我们无法用钢筋撬开裂缝，但我们认为它们是巢穴，因为存在卵丝（图1和图2）。1-3)和社会活动。由于没有描述过欧扎克冥龟的巢穴，而且我们的观察似乎与亚历山大（1927）和毕晓普（1941）描述的隐鳃亚目的巢穴不同，我们在此对这两个巢穴做一个简要的描述。鸟巢一号于10月2日上午13时在沿着浅滩的东部边缘被发现。水温为170 ℃，没有明显的电流。一个单一的鸡蛋链是突出的（图。1-3)从一个裂缝。基岩的顶部几乎有2米长，35至40厘米厚，位于一个巨大的基岩板上。洞口长1米多，高4.0厘米，大部分垂直于河床，面向上游。至少一个C。a.毕晓普在巢中，不到15分钟，一只成年雌性就走到巢岩上，从边缘滑了下来，看起来已经精疲力竭了（图3）。10月8日13：20 CSDST在东部4米范围内发现了第二个巢
Two Ozark hellbender, Cryptobranchus alleganiensis bishopi, nests were discovered by the authors in early October 1980 within crevices between dolomitic limestone bedrock in the North Fork of the White River, Ozark County, Missouri. Although we were unable to pry into the crevices with steel bars we assume they were nests because of the presence of egg strands (Figs. 1-3) and social activity. Since the nests of Ozark hellbenders have not been described, and because our observations seem to vary from Cryptobranchus nests described by Alexander (1927) and Bishop (1941), we herein include a brief description of the two nests. Nest One was discovered at 13:30 h CSDST on 2 October along the eastern margin of a riffle. Water temperature was 170C and there was no noticeable current. A single strand of eggs was protruding (Figs. 1-3) from a crevice. The top portion of bedrock was almost 2 m in length, 35 to 40 cm thick and rested in a huge slab of bedrock. The opening extended for more than a meter in length and to 4.0 cm in height, was mostly perpendicular to the stream bed, and faced upsteam. At least one C. a. bishopi was in the nest, and within fifteen minutes an adult female, which appeared to be spent, walked to the nest rock and slid under its margin (Fig. 3). Nest Two was found 8 October at 13:20 h CSDST within 4 m of the east