Arid
DOI10.2307/2269603
The effects of land use on the structure of ground-foraging ant communities in the Argentine Chaco
Bestelmeyer, BT; Wiens, JA
通讯作者Bestelmeyer, BT
来源期刊ECOLOGICAL APPLICATIONS
ISSN1051-0761
出版年1996
卷号6期号:4页码:1225-1240
英文摘要

We examined the responses of a ground-foraging ant community to a gradient of land-use intensity in a grazing agroecosystem in the Chaco of northern Argentina. The gradient extended from a highly degraded condition characteristic of traditional grazing practices, through an area of less severe disturbance where grazing was less concentrated, to two areas in which grazing had been managed for 3 and 18 yr, respectively. Ground cover changed along this gradient from bare to litter-covered, ground-layer vegetation changed from sparse to a structurally complex mixture of grasses and forbs, and canopy cover increased in areas of intermediate grazing intensity and then decreased. Community diversity varied among the sites depending on both season and scale of analysis. Site-scale ant species richness was slightly higher in sites of intermediate disturbance in the summer-wet season but was much greater in the least disturbed site in the winter-dry season. The same dry-season pattern was evident in both species richness and diversity at the scale of transects within sites, whereas species richness at the scale of individual traps within transects was significantly lower at sites of intermediate disturbance than at either highly restored or highly degraded sites. Abundances of individual ant species and functional groups also changed along the land-use gradient. Litter-inhabiting cryptic species and specialized predators responded positively to grazing management, whereas opportunists and the hot-climate specialist Forelius nigriventris were prevalent in highly disturbed areas. Other functional groups exhibited redundancy and species turnover along the gradient. Detrended correspondence analysis (DCA) revealed that the ant faunas at the extremes of the land-use gradient were more similar than expected. We hypothesize that the interaction of local-scale habitat features with historical and biogeographic influences may determine the responses of this ant community to land use, and that highly degraded areas may have conservation value because they are regional sources of arid-adapted ants.


英文关键词ants Argentina biodiversity biogeography Chaco conservation disturbance by grazing Formicidae functional groups, ants semiarid ant habitats
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:A1996VR85600024
WOS关键词BIODIVERSITY ; DIVERSITY ; FOREST ; CONSERVATION ; DISTURBANCE ; ASSEMBLAGES ; ECOSYSTEMS ; AUSTRALIA ; VEGETATION ; DYNAMICS
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
来源机构Colorado State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/132593
作者单位(1)COLORADO STATE UNIV,GRAD DEGREE PROGRAM ECOL,FT COLLINS,CO 80523
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GB/T 7714
Bestelmeyer, BT,Wiens, JA. The effects of land use on the structure of ground-foraging ant communities in the Argentine Chaco[J]. Colorado State University,1996,6(4):1225-1240.
APA Bestelmeyer, BT,&Wiens, JA.(1996).The effects of land use on the structure of ground-foraging ant communities in the Argentine Chaco.ECOLOGICAL APPLICATIONS,6(4),1225-1240.
MLA Bestelmeyer, BT,et al."The effects of land use on the structure of ground-foraging ant communities in the Argentine Chaco".ECOLOGICAL APPLICATIONS 6.4(1996):1225-1240.
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