Arid
DOI10.1016/j.biocon.2014.09.036
Simplification of the composition, diversity and structure of woody vegetation in a semi-arid African savanna reserve following the re-introduction of elephants
O’Connor, T. G.1,2; Page, B. R.3
通讯作者O’Connor, T. G.
来源期刊BIOLOGICAL CONSERVATION
ISSN0006-3207
EISSN1873-2917
出版年2014
卷号180页码:122-133
英文摘要

Elephant populations at high density commonly transform their habitat, but a low density population would not be expected to have a marked impact. Re-introduction of elephants into the Venetia-Limpopo Nature Reserve (320 km(2)) in the early 1990s established a low density population for the period of survey (0.16-0.33 individuals km(-2)). Accordingly, their impact on the composition and structure of the woody vegetation of three riparian and nine dryland vegetation types was measured between 1997 and 2010 using 148 permanent transects. Riparian habitat showed a greater change in composition and diversity, and also a greater decline of species richness, density of tall trees or total basal area, than dryland habitat. Change of dryland Commiphora Woodland was comparable to changes of riparian types. These conspicuous changes were a consequence primarily of severe use by elephants. Some species within these vegetation types declined markedly in abundance. Vegetation types dominated by Colophospermum mopane showed an increase in total basal area and relatively minor change in composition or structure, resulting mainly from the impact of moisture stress. Vegetation types that were severely impacted by elephants constituted <10% of reserve area; lightly impacted dryland C. mopane types constituted >70% of area. Some uncommon, selected dryland species were heavily impacted by elephants. A number of species may therefore be trending toward local extirpation. It was concluded that the coexistence of elephants and some plant species in this medium-sized, contained reserve was not possible. (C) 2014 Elsevier Ltd. All rights reserved.


英文关键词Colophospermum mopane Moisture stress Tree density Woody structure
类型Article
语种英语
国家South Africa
收录类别SCI-E
WOS记录号WOS:000346211700013
WOS关键词MANYARA-NATIONAL-PARK ; COLOPHOSPERMUM-MOPANE ; ACACIA-TORTILIS ; WOODLAND ; IMPACT ; FIRE ; HERBIVORES ; LANDSCAPE ; MORTALITY ; DYNAMICS
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181092
作者单位1.SAEON, ZA-0001 Pretoria, South Africa;
2.Univ Witwatersrand, Sch Anim Plant & Environm Sci, Johannesburg, South Africa;
3.Univ KwaZulu Natal, Sch Life Sci, Durban, South Africa
推荐引用方式
GB/T 7714
O’Connor, T. G.,Page, B. R.. Simplification of the composition, diversity and structure of woody vegetation in a semi-arid African savanna reserve following the re-introduction of elephants[J],2014,180:122-133.
APA O’Connor, T. G.,&Page, B. R..(2014).Simplification of the composition, diversity and structure of woody vegetation in a semi-arid African savanna reserve following the re-introduction of elephants.BIOLOGICAL CONSERVATION,180,122-133.
MLA O’Connor, T. G.,et al."Simplification of the composition, diversity and structure of woody vegetation in a semi-arid African savanna reserve following the re-introduction of elephants".BIOLOGICAL CONSERVATION 180(2014):122-133.
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