Scheibler D R, Christoff A U
Departamento de Zoologia, Universidade Estadual Paulista, Rio Claro, SP, 13506-900, Brazil.
Braz J Biol. 2007 Nov;67(4):619-25. doi: 10.1590/s1519-69842007000400005.
We inventoried terrestrial small mammals in an agricultural area in southern Brazil by using trapping and prey consumed by Barn Owls (Tyto alba) and White-tailed Kites (Elanus leucurus). Small mammals were trapped in three habitat types: corn fields, uncultivated fields ("capoeiras"), and native forest fragments. A total of 1,975 small mammal specimens were trapped, another 2,062 identified from the diet of Barn Owls, and 2,066 from the diet of White-tailed Kites. Both trapping and prey in the predators' diet yielded 18 small mammal species: three marsupials (Didelphis albiventris, Gracilinanus agilis, and Monodelphis dimidiata) and 15 rodents (Akodon paranaensis, Bruceppatersonius iheringi, Calomys sp., Cavia aperea, Euryzygomatomys spinosus, Holochilus brasiliensis, Mus musculus, Necromys lasiurus, Nectomys squamipes, Oligoryzomys nigripes, Oryzomys angouya, Oxymycterus sp.1, Oxymycterus sp.2, Rattus norvegicus, and Rattus rattus (Linnaeus, 1758)). The greatest richness was found in the uncultivated habitat. We concluded that the three methods studied for inventorying small mammals (prey in the diet of Barn Owls, White-tailed Kites, and trapping) were complementary, since together, rather than separately, they produced a better picture of local richness.
我们通过诱捕以及分析仓鸮（Tyto alba）和白尾鸢（Elanus leucurus）所捕食的猎物，对巴西南部一个农业地区的陆生小型哺乳动物进行了清查。小型哺乳动物在三种栖息地类型中被诱捕：玉米田、未开垦田地（“卡波埃拉”）和原生森林片段。总共诱捕到1975个小型哺乳动物标本，另外从仓鸮的食物中鉴定出2062个，从白尾鸢的食物中鉴定出2066个。诱捕和捕食者食物中的猎物都产生了18种小型哺乳动物：三种有袋动物（白腹袋鼬、敏捷侏袋貂和半纹袋鼬）和15种啮齿动物（巴拉那稻鼠、伊氏布氏鼠、南美原鼠属、豚鼠、多刺毛鼠、巴西沼鼠、小家鼠、黑髯暮鼠、鳞足水鼠、黑爪鼠、安古亚稻鼠、尖吻鼠属1、尖吻鼠属2、褐家鼠和黑家鼠（林奈，1758年））。未开垦栖息地的物种丰富度最高。我们得出结论，所研究的三种清查小型哺乳动物的方法（仓鸮、白尾鸢食物中的猎物以及诱捕）是互补的，因为它们共同作用而非单独作用时，能更全面地呈现当地的物种丰富度情况。
