Putting the ‘‘Ecology’’ into Environmental Flows: Ecological Dynamics and Demographic Modelling

Will Shenton, Nick Bond, Jian D. L. Yen, Ralph MAC NALLY

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

There have been significant diversions of water from rivers and streams around the world; natural flow regimes have been perturbed by dams, barriers and excessive extractions. Many aspects of the ecological 'health' of riverine systems have declined due to changes in water flows, which has stimulated the development of thinking about the maintenance and restoration of these systems, which we refer to as environmental flow methodologies (EFMs). Most existing EFMs cannot deliver information on the population viability of species because they: (1) use habitat suitability as a proxy for population status; (2) use historical time series (usually of short duration) to forecast future conditions and flow sequences; (3) cannot, or do not, handle extreme flow events associated with climate variability; and (4) assume process stationarity for flow sequences, which means the past sequences are treated as good indicators of the future. These assumptions undermine the capacity of EFMs to properly represent risks associated with different flow management options; assumption (4) is untenable given most climatechange predictions. We discuss these concerns and advocate the use of demographic modelling as a more appropriate tool for linking population dynamics to flow regime change. A ‘meta-species’ approach to demographic modelling is discussed as a useful step from habitat based models towards modelling strategies grounded in ecological theory when limited data are available on flow-demographic relationships. Data requirements of demographic models will undoubtedly expose gaps in existing knowledge, but, in so doing, will strengthen future efforts to link changes in river flows with their ecological consequences.
Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalEnvironmental Management
Volume50
DOIs
Publication statusPublished - 2012
Externally publishedYes

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Ecology
Rivers
River diversion
ecology
Population dynamics
Dams
Restoration
modeling
Water
Time series
Health
methodology
ecological theory
river flow
habitat use
water flow
population dynamics
viability
dam
time series

Cite this

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abstract = "There have been significant diversions of water from rivers and streams around the world; natural flow regimes have been perturbed by dams, barriers and excessive extractions. Many aspects of the ecological 'health' of riverine systems have declined due to changes in water flows, which has stimulated the development of thinking about the maintenance and restoration of these systems, which we refer to as environmental flow methodologies (EFMs). Most existing EFMs cannot deliver information on the population viability of species because they: (1) use habitat suitability as a proxy for population status; (2) use historical time series (usually of short duration) to forecast future conditions and flow sequences; (3) cannot, or do not, handle extreme flow events associated with climate variability; and (4) assume process stationarity for flow sequences, which means the past sequences are treated as good indicators of the future. These assumptions undermine the capacity of EFMs to properly represent risks associated with different flow management options; assumption (4) is untenable given most climatechange predictions. We discuss these concerns and advocate the use of demographic modelling as a more appropriate tool for linking population dynamics to flow regime change. A ‘meta-species’ approach to demographic modelling is discussed as a useful step from habitat based models towards modelling strategies grounded in ecological theory when limited data are available on flow-demographic relationships. Data requirements of demographic models will undoubtedly expose gaps in existing knowledge, but, in so doing, will strengthen future efforts to link changes in river flows with their ecological consequences.",
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Putting the ‘‘Ecology’’ into Environmental Flows: Ecological Dynamics and Demographic Modelling. / Shenton, Will; Bond, Nick; Yen, Jian D. L.; MAC NALLY, Ralph.

In: Environmental Management, Vol. 50, 2012, p. 1-10.

Research output: Contribution to journalArticle

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