Disturbance and the role of refuges in mediterranean climate streams

Robson, Belinda J., Chester, Edwin T., Mitchell, Bradley D. and Matthews, Ty G. 2013, Disturbance and the role of refuges in mediterranean climate streams, Hydrobiologia, vol. 719, no. 1, pp. 77-91.

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Title Disturbance and the role of refuges in mediterranean climate streams
Author(s) Robson, Belinda J.
Chester, Edwin T.
Mitchell, Bradley D.
Matthews, Ty G.
Journal name Hydrobiologia
Volume number 719
Issue number 1
Start page 77
End page 91
Total pages 15
Publisher Springer
Place of publication Amsterdam, The Netherlands
Publication date 2013-11
ISSN 0018-8158
1573-5117
Keyword(s) climate change
drought refuge
flow regulation
intermittent rivers
refugia
salinisation
sedimentation
Summary Refuges protect plant and animal populations from disturbance. Knowledge of refuges from disturbance in mediterranean climate rivers (med-rivers) has increased the last decade. We review disturbance processes and their relationship to refuges in streams in mediterranean climate regions (med-regions). Med-river fauna show high endemicity and their populations are often exposed to disturbance; hence the critical importance of refuges during (both seasonal and supraseasonal) disturbances. Disturbance pressures are increasing in med-regions, in particular from climatic change, salinisation, sedimentation, water extraction, hydropower generation, supraseasonal drought, and wildfire. Med-rivers show annual cycles of constrained precipitation and predictable seasonal drying, causing the biota to depend on seasonal refuges, in particular, those that are spatially predictable. This creates a spatial and temporal mosaic of inundation that determines habitat extent and refuge function. Refuges of sufficient size and duration to maintain populations, such as perennially flowing reaches, sustain biodiversity and may harbour relict populations, particularly during increasing aridification, where little other suitable habitat remains in landscapes. Therefore, disturbances that threaten perennial flows potentially cascade disproportionately to reduce regional scale biodiversity in med-regions. Conservation approaches for med-river systems need to conserve both refuges and refuge connectivity, reduce the impact of anthropogenic disturbances and sustain predictable, seasonal flow patterns.
Language eng
Field of Research 060204 Freshwater Ecology
050101 Ecological Impacts of Climate Change
Socio Economic Objective 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2013, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30051576

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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