Arid
DOI10.1071/MF11060
Is the hyporheic zone a refuge for macroinvertebrates in drying perennial streams?
Young, B. A.1,2; Norris, R. H.1; Sheldon, F.2
通讯作者Young, B. A.
来源期刊MARINE AND FRESHWATER RESEARCH
ISSN1323-1650
出版年2011
卷号62期号:12页码:1373-1382
英文摘要

Drought and drying of perennial streams plays a central role in determining the structure of in-stream communities, decreasing taxa richness and abundance and changing trophic organisation. Further, flow cessation can increase spatial beta-diversity of macroinvertebrate communities across disconnected sites. It has been hypothesised that the hyporheic zone may act as a refugium for benthic macroinvertebrates during low flow and flow cessation, but evidence remains equivocal. We explored hyporheic and surface benthic macroinvertebrate community changes associated with low flow and flow cessation conditions during a supra-seasonal drought on two normally perennial rivers: the Cotter and Queanbeyan Rivers ( Canberra, ACT). Surface benthic and hyporheic samples were collected from these two rivers and four associated tributary streams across a drying gradient during dry conditions and after flow recovery to test whether macroinvertebrates in perennial streams utilise the hyporheic zone as a refugium and whether there is greater variability in the macroinvertebrate community at sites experiencing flow cessation compared with wetter sites. Low flow had no impact on macroinvertebrate taxa richness or density in either surface benthic or hyporheic habitats, whereas density and taxa richness declined during streambed drying, suggesting that the hyporheic zone did not provide a refugium for some taxa during these dry conditions. Spatial beta-diversity peaked at dry sites, likely in response to the broad range of environmental conditions that may differ between refuges and sites, but decreased after flow recovery. Refuges in perennial streams appear more vulnerable to human disturbances during dry periods because a loss of suitable refuges can affect the ability of some macroinvertebrate taxa to recolonise after flow recovery.


英文关键词aquatic insects drought hyporheos low flow refugia streambed drying
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000297517600003
WOS关键词AUSTRALIAN DRYLAND RIVERS ; SUPRA-SEASONAL DROUGHT ; 2 INTERMITTENT STREAMS ; NEW-ZEALAND ; DESERT STREAM ; FAUNAL COMPOSITION ; HEADWATER STREAMS ; FLOW VARIABILITY ; AQUATIC REFUGIA ; WATER-QUALITY
WOS类目Fisheries ; Limnology ; Marine & Freshwater Biology ; Oceanography
WOS研究方向Fisheries ; Marine & Freshwater Biology ; Oceanography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/169613
作者单位1.Univ Canberra, Inst Appl Ecol, Bruce, ACT 2601, Australia;
2.Griffith Univ, Griffith Sch Environm, Australian Rivers Inst, Nathan, Qld 4111, Australia
推荐引用方式
GB/T 7714
Young, B. A.,Norris, R. H.,Sheldon, F.. Is the hyporheic zone a refuge for macroinvertebrates in drying perennial streams?[J],2011,62(12):1373-1382.
APA Young, B. A.,Norris, R. H.,&Sheldon, F..(2011).Is the hyporheic zone a refuge for macroinvertebrates in drying perennial streams?.MARINE AND FRESHWATER RESEARCH,62(12),1373-1382.
MLA Young, B. A.,et al."Is the hyporheic zone a refuge for macroinvertebrates in drying perennial streams?".MARINE AND FRESHWATER RESEARCH 62.12(2011):1373-1382.
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