Small Mammal Abundances in a Grassland and Forest Area at the Lake Fayetteville Environmental Center, Arkansas

D. James, S. Bartholomew, A. Deshwal, P. Panwar
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Abstract

We examined changes in abundance of small mammals in forest and prairie-grassland habitat at Lake Fayetteville, Arkansas over a period of 32 years. We estimated the population size of small mammals using a mark-recapture method by capturing small mammals employing rat-sized Sherman live traps laid out in a grid with 8 rows of traps, 15 traps per row, 9.14 m (30 feet) between traps and rows covering an area of 1.01 ha (2.5 acres) in size. Six species of mammals were trapped in the prairie-grassland and three species were captured in the forest habitat. In the forest, the white-footed deermouse (Peromuscus leucopus) was greatest in 1998 and in 2006. In the prairie-grassland, the population of hispid cotton rats (Sigmodon hispidus) were greatest in 2004, 2008, 2010 and 2014 and have increased over the years with the change in grass composition. The prairiegrassland in 1962 was mainly a broomsedge bluestem (Andropogon virginicus) field but as time progressed more and more prairie grasses invaded helped by controlled burns and removal of the invading eastern red cedars (Juniperus virginiana). The population of Sigmodon hispidus was weakly correlated with the minimum winter temperatures from the previous year.
阿肯色州费耶特维尔湖环境中心草原和森林地区的小型哺乳动物数量
我们研究了32年来阿肯色州费耶特维尔湖森林和草原-草地生境中小型哺乳动物数量的变化。我们使用标记-再捕获法捕获小型哺乳动物,通过使用鼠大小的Sherman活陷阱捕获小型哺乳动物,这些陷阱布置在8排陷阱中,每行15个陷阱,陷阱与行之间9.14米(30英尺),面积为1.01公顷(2.5英亩)。在草原-草地生境捕获哺乳动物6种,在森林生境捕获哺乳动物3种。1998年和2006年森林中白足鹿鼠数量最多。2004年、2008年、2010年和2014年,草原-草原间棉鼠数量最多,且随草类组成的变化呈增加趋势。1962年的草原草地主要为帚莎草(Andropogon virginicus)田,但随着时间的推移,在对入侵的东部红杉(Juniperus virginia)的控制和清除的帮助下,越来越多的草原草入侵。西格莫登种群数量与前一年冬季最低气温呈弱相关。
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