Detecting effects of environmental water allocations in wetlands of the Murray-Darling Basin, Australia

Reid, Michael; Brooks, Joseph

doi:10.1002/1099-1646(200009/10)16:5<479::aid-rrr599>3.0.co;2-y

Cited by 60 publications

(11 citation statements)

References 60 publications

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“…Whilst the current study demonstrates that otolith chemical analysis can be used in a similar manner to discriminate between potential recruitment sources of carp, it also raises the possibility that such techniques might Copyright be applied at larger spatial scales to monitor the responses of fish populations to water management in regulated river systems. Given that understanding of the ecological response to water management is a key aspect of adaptive restoration in regulated rivers (Reid and Brooks, 2000), the development of such techniques has the potential to enhance our ability to monitor the impacts of water management and to adjust management responses accordingly.…”

Section: Discussionmentioning

confidence: 99%

Use of otolith chemical signatures to estimate carp recruitment sources in the mid-Murray River, Australia

Crook

Gillanders

2006

River Res. Applic.

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Recent research has suggested that the Barmah-Millewa forest (BMF) floodplain provides a particularly important spawning ground for carp in the Murray River and that there is a large export of juvenile carp from the BMF into other parts of the Murray River system. This study examined whether chemical analysis of otoliths (fish ear stones) represents a feasible technique for estimating the relative importance of particular sources of carp recruitment in the Murray River. Otolith chemical signatures were analysed for fish collected from three lakes on the BMF floodplain and from three major tributaries of the mid-Murray River. A single site downstream of these potential sources of carp recruitment (Torrumbarry Weir) was then examined to estimate the relative contribution of the BMF and the tributaries to carp recruitment at this site. The results of the study suggest that at least some of the lakes on the BMF floodplain are important sources of carp in the mid-Murray River. Using a maximum likelihood analysis of otolith chemical signatures, it was estimated that Barmah Lake and Moira Lake were the most likely recruitment sources for 98% of the fish collected from Torrumbarry Weir. The study demonstrates the potential application of otolith chemical analyses for determining the relative importance of potential recruitment sources of fish in rivers.

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Section: Discussionmentioning

confidence: 99%

Use of otolith chemical signatures to estimate carp recruitment sources in the mid-Murray River, Australia

Crook

Gillanders

2006

River Res. Applic.

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“…With intermittent flow comes the loss of lotic habitats and increased lentic habitats (Lake, 2003); both considered to be features of the Murray River channel, prior to main-stem dams. The low channel gradient (<5 cm km −1 ) of the Murray River is often emphasized (Shiel, Walker, & Williams, 1982;Thoms, Rayburg, & Neave, 2008) and the unregulated Murray River is characterized as slow-flowing (Reid & Brooks, 2000).…”

Section: Present Perceptions Of the Unregulated Murray River At Lowmentioning

confidence: 99%

History, hydrology and hydraulics: Rethinking the ecological management of large rivers

Mallen‐Cooper

Zampatti

2018

Ecohydrology

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Climatic extremes capture imaginations and provide a fundamental premise for biologists—that ecosystems are adapted to natural variability. Hence, understanding past extremes provides a template for contemporary ecological models and management. Nevertheless, myths can develop around historical climatic events, distorting perceptions of the past. The mythology of the Murray River in Australia is that over 100 years ago, it naturally “dried to a series of pools” in drought; therefore, the biota are flexible and adapted to hydrological variability and lentic habitats. Analysis of historical and modelled hydrology and hydrodynamics, however, demonstrates that: (a) cease‐to‐flow events were not natural and were instead caused by multiple small‐scale irrigation diversions; and (b) the Murray River had widespread perennial lotic habitats. Within a generation, the spatial, temporal, and causal context was lost and with it, the links between preregulation hydrology and hydraulics, and river ecology. From an intermittently lentic system, we propose an alternative model which integrates ecohydrology and ecohydraulics. Specifically, the model incorporates: (a) persistence of lotic in‐channel and lentic off‐channel refugia, even in droughts; and (b) a reliable spring flow pulse that increases hydrodynamic complexity, promotes longitudinal integrity of lotic conditions and replenishes low‐lying wetlands. The model helps explain the decline of lotic biota, suggesting that hydraulic change has had a greater impact on aquatic biodiversity than changes in hydrology. Being mindful of historical conditions and considering spatio‐temporal ecohydraulics provides new opportunities for the rehabilitation of highly modified rivers and may assist the strategic development of large rivers, including for hydropower.

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“…In order to do this it is appropriate to construct a conceptual model that proposes a mechanism through which an event might cause a change in ecosystem components (Downes et al, 2002). Response variables should be sensitive to the putative stressor or driver and should provide information relevant to the management goals (Reid and Brooks, 2000). A proven causal relationship between the stressor or driver and the response variable and knowledge of the significance of the magnitude of change are important for interpreting the response data.…”

Section: Environmental Indicatorsmentioning

confidence: 99%

“…Variables that change rapidly through time are suited to short term monitoring with a high frequency of sampling (e.g. zooplankton - Reid and Brooks, 2000). Monitoring rapidly changing variables over the long term could prove prohibitively costly and it may be prudent to confine short and long term monitoring objectives to separate programs.…”

Section: Environmental Indicatorsmentioning

confidence: 99%

Australian Capital Territory

LUCAS¹

1991

Emergency Medicine

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Detecting effects of environmental water allocations in wetlands of the Murray-Darling Basin, Australia

Cited by 60 publications

References 60 publications

Use of otolith chemical signatures to estimate carp recruitment sources in the mid-Murray River, Australia

Use of otolith chemical signatures to estimate carp recruitment sources in the mid-Murray River, Australia

History, hydrology and hydraulics: Rethinking the ecological management of large rivers

Australian Capital Territory

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