Rampantpoachingreduced the total black rhinoceros population to some 2,400 by 1995, and the International Union for the Conservation of Nature and Natural Resources listed it as acritically endangered speciesstarting in 1996. Conservation efforts brought the numbers up to approximately 5,600 by 2018....
In the two decades between 1910 and 1930, over ten percent of the Black population of the United States left the South, where the majority of the Black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1916 and 1918. It ...
Although the data from the decennial censuses of 1820 to 1860 are serviceable for an analysis of the ante bellum black population, they require some reorganisation and correction before they can be made to yield acceptable estimates of its parameters. In this study four separate analyses were used...
对于这场规模巨大、影响深远的人口流动现象,国内外史学界都有不少的研究 From 1910 to 1960, the black American population flowing and the again distribution was in the 20th century US population geography the most remarkable phenomenon.Regarding this scale huge, influence profound population phenomenon of...
We observed ranging patterns in a black colobus population in the Forêt des Abeilles, Central Gabon. We compared the results with those for two other populations (Lopé Reserve in Central Gabon, Douala-Edéa in coastal Cameroun) in order to estimate the extent of specific variability in populatio...
Growth of the Black Population in ante bellum America, 1820-1860doi:10.2307/2173582Eblen
1993. Latino, Asian, and black segregation in multi-ethnic metro ar- eas: findings from the 1990 Census. Res. Rep. Popul. Stud. Cent., Univ. Mich... WH Frey,R Farley - 《Ann Arbor Michigan University of Michigan Population Studies Center Apr》 被引量: 23发表: 1993年 Area characteristi...
Sutherland 展开 摘要: Aims To estimate the population size of the Icelandic race of Black-tailed Godwit and infer numbers wintering in areas where both the Icelandic and nominate races overlap. DOI: 10.1080/00063650509461385 年份: 2005
Growth of the yellow-margined box turtle (Cuora flavomarginata) was studied in northern Taiwan on the basis of recapture data and estimates using the age-c... TH Chen,KY Lue - 《Journal of Herpetology》 被引量: 163发表: 2002年 Nonlinear stochastic modeling of aphid population growth. This...
结果1 题目 The free black population increased in a number of ways: children born of colored free women; mixed-race children born of white masters and free black women: freed slaves who escaped. 相关知识点: 试题来源: 解析 √ 反馈 收藏 ...