首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
David  Lack 《Ibis》1948,90(2):252-279
  相似文献   

9.
C. St. C. Robinson 《Ostrich》2013,84(3):153-158
Counting Saddle-billed Storks in a study area the size of the Kruger National Park, at 2.2 million ha, is difficult because the birds are long-lived, sparse in the landscape and have large home ranges. Aerial surveys conducted to date provide an estimate with no measure of data dispersion, thence precision. The aim of this study was to estimate the population size within associated confidence limits using a modified mark–recapture field method. The vehicle survey, conducted shortly after rainfall in the area, did not produce results with known precision under these conditions. A repeat of this census in spring, after the peak breeding season and when surface water is confined to the larger rivers and dams, should yield different results. A photographic census technique yielded sufficient information to construct a population registration database. Individual identification profiles indicate that there are at least 40 adult Saddle-billed Storks in the southern part of the Kruger National Park. This is considered the minimum number of known-to-be-alive individuals in this area. In this paper, the Cormack–Jolly–Seber mark– recapture model was used to return an estimate of the population size for each capture occasion.  相似文献   

10.
NOTES ON THE BIOLOGY OF AZOTOBACTER   总被引:3,自引:1,他引:2  
  相似文献   

11.
12.
李锡文 《植物研究》1987,7(3):137-138
作者于1985年有机会到美国哈佛大学标本馆检查中国唇形科植物模式标本,发现两个新异名如下:1)耳齿紫苏Perilla frutescens(Linn.)Britt var.auriculatodentata C.Y.Wu et Hsuan.即系湖南香薷Elsholtzia hunanensis Hand.-Mazz.;2)藏荆芥Nepeta angustifolia C.Y.Wu即系江达荆芥N.hemsleyana Oliv。今特此修正。  相似文献   

13.
14.
15.
16.
《Ibis》1960,102(4):618-619
  相似文献   

17.
18.
19.
20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号