| 注意： |
Fig. 1. Diagram showing geographic variation in numbers of gastrosteges in populations of Thamnophis sirtalis (based upon scale counts published by Van Denburgh and Slevin, 1918, pp. 195-198 and 201-202). Broken line at right connects means in series of males; broken line at left connects means in series of females. Note that differences are slight between populations, with much overlapping in most instances, and that in general there are continuous trends toward reduction in numbers from south to north, and from the interior to the coastal region.
Fig. 2. Diagram showing geographic variation in numbers of urosteges in the same populations of Thamnophis sirtalis represented by figure 1. Note that trends in numbers of urosteges in general parallel trends in numbers of gastrosteges.
Fig. 3. Map showing locality records for specimens examined of Thamnophis sirtalis; 1. T. s. pickeringii; 2. T. s. concinnus; 3. T. s. tetrataenia; 4. T. s. infernalis. Two far northern records of tetrataenia, Hazelton and Kispiox Valley, are not shown. |
引证/输出
预览资料
文章 : 英语