| 文件类型： |
文章 |
| 所有的著者/提供者： |
Dean E Metter |
| ISSN: | 0045-8511 |
|---|
| OCLC号码： |
483668342 |
| 语言注释： |
English |
| 注意： |
Fig. 3. Hind foot of Palouse (left) and Touchet Ascaphus. An encysted metacercaria is on the web between the toes of the Touchet specimen.
Fig. 4. Nuptial Pads of Male Ascaphus (Left to Right), September, June, August, October.
Fig. 5. Adult Ascaphus from the Palouse (Top) and Touchet Areas.
Fig. 6. Opened Male Ascaphus Cloacae (Left to Right), June, August, October (Note Increase in Tubercle Size as Well as Cloacal Spines).
Fig. 7. Mouthparts of Palouse (Left) and Touchet Larval Ascaphus.
Fig. 8. Series of Ascaphus Larvae from the Palouse (Top) and Touchet Areas. |
| 奖励： |
|
摘要：
Two populations of Ascaphus truei from northern Idaho and southeastern Washington show numerous differences in body proportions and conform poorly with named subspecies. The coloration and pattern of adults and tadpoles from the two areas are distinctive. The life history is similar in the two areas, but differs from that described for populations on the Olympic Peninsula. Breeding occurs in early fall. Male secondary sexual characteristics are highly developed only during the breeding season. The egg-laying season extends from late June to early August; sperm are evidently retained by the female from breeding the previous fall. Eggs hatch in August and September. Larvae possess hind legs at the age of two years, but transformation is not completed until 3 years after hatching. The distribution of Ascaphus is restricted in the two areas but shows no apparent correlation with changes in habitat or predators.
引证/输出
预览资料
文章 : 英语