排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
2.
3.
G. G. Matishov N. G. Chelintsev Yu. I. Goryaev P. R. Makarevich D. G. Ishkulov 《Doklady Earth Sciences》2014,458(2):1312-1316
This article presents a method of assessment of the amount of polar bears on the basis of data on vessel counts. The results of 32 vessel transect counts in the southern part of the Kara Sea are used as the primary data. They are processed in an original program using separate extrapolation by sectors and summarizing of data of several different counts. In recent years, the calculated amount of bears in the studied region has varied from 3300 to 3100 individuals (3200, on average). The relative statistical error of estimations smoothly decreases from 8 to 7%. The confidence interval of the estimation at statistical error of 7% and probability level of 95% is 2700–3500 individuals. 相似文献
1