Response of stream invertebrate communities to vegetation damage from overgrazing by exotic rabbits on subantarctic Macquarie Island

被引:7
作者
Marchant, R. [1 ]
Kefford, B. J. [2 ]
Wasley, J. [3 ]
King, C. K. [3 ]
Doube, J. [3 ]
Nugegoda, D. [4 ]
机构
[1] Museum Victoria, Dept Entomol, Melbourne, Vic 3001, Australia
[2] Univ Technol Sydney, Dept Environm Sci, Broadway, NSW 2007, Australia
[3] Australian Antarctic Div, Kingston, Tas 7050, Australia
[4] RMIT Univ, Bundoora, Vic 3083, Australia
基金
澳大利亚研究理事会;
关键词
catchment disturbance; island streams; ACHERON RIVER; MACROINVERTEBRATES; COLONIZATION;
D O I
10.1071/MF10317
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Widespread damage to vegetation on an isolated oceanic island (Macquarie Island), due to overgrazing (since 2002) by an expanding exotic rabbit population, could affect the nature of catchment runoff and result in changes to stream habitats and the composition of their invertebrate communities. To test this hypothesis, stream invertebrate communities that had been sampled originally in 1992 (at 15 sites when rabbit numbers were historically low), were re-sampled in 2008 (17 sites) and in 2010 (12 sites). The number of taxa recorded at each site was 25-36% lower in 2008 (7.4 taxa per site) and in 2010 (8.7 taxa) than in 1992 (11.6 taxa) and an abundance index showed a substantial decline across most taxa. Ordination indicated that composition at all sites changed markedly between years. The greatest compositional changes occurred at sites exposed to moderate or severe levels of vegetation damage, suggesting that stream invertebrates responded to habitat changes associated with increased grazing. An altered input of organic material into the streams as a result of vegetation damage may have been responsible. If communities of stream invertebrates on isolated islands are degraded, then composition may be altered permanently, unless refuges are available.
引用
收藏
页码:404 / 413
页数:10
相关论文
共 34 条
[1]   Landscapes and riverscapes: The influence of land use on stream ecosystems [J].
Allan, JD .
ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS, 2004, 35 :257-284
[2]  
Anderson M.J., 2008, Permanova+for Primer: guide to software and statistical methods
[3]  
[Anonymous], LIMNOLOGIE
[4]  
[Anonymous], 2006, Primer
[5]  
[Anonymous], 1970, ECOLOGY RUNNING WATE
[6]  
[Anonymous], 1948, Insects of Hawaii: Volume 1
[7]  
[Anonymous], 1971, AQUATIC OLIGOCHAETA
[8]   Indirect effects of invasive species removal devastate World Heritage Island [J].
Bergstrom, Dana M. ;
Lucieer, Arko ;
Kiefer, Kate ;
Wasley, Jane ;
Belbin, Lee ;
Pedersen, Tore K. ;
Chown, Steven L. .
JOURNAL OF APPLIED ECOLOGY, 2009, 46 (01) :73-81
[9]  
Brasher AMD, 2003, BIOSCIENCE, V53, P1052, DOI 10.1641/0006-3568(2003)053[1052:IOHDOB]2.0.CO
[10]  
2