Continuing the discussion about ecological futures for the lower Murray River (Australia) in the Anthropocene

2021 ◽  
Author(s):  
C. Max Finlayson ◽  
Peter A. Gell ◽  
John Conallin
Keyword(s):  
Murray River

Seasonal succession and long-term stability of pelagic community in a productive reservoir

2005 ◽  
Vol 56 (8) ◽  
pp. 1137 ◽  
Author(s):  
V. F. Matveev ◽  
L. K. Matveeva
Keyword(s):  
Time Series ◽  
Water Level ◽  
Seasonal Succession ◽  
Perca Fluviatilis ◽  
Taxonomic Composition ◽  
Stationary Time Series ◽  
Introduced Fish ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Murray River

In Lake Hume, a reservoir located in an active agricultural zone of the Murray River catchment, Australia, time series for the abundances of phytoplankton and zooplankton taxa, monitored from 1991 through to 1996, were stationary (without trends), and plankton taxonomic composition did not change. This indicated ecosystem resilience to strong fluctuations in reservoir water level, and to other potential agricultural impacts, for example eutrophication and pollution. Although biological stressors such as introduced fish and invertebrate predators are known to affect planktonic communities and reduce biodiversity in lakes, high densities of planktivorous stages of alien European perch (Perca fluviatilis) and the presence of carp (Cyprinus carpio) did not translate into non-stationary time series or declining trends for plankton in Lake Hume. However, the seasonal successions observed in the reservoir in different years did not conform well to the Plankton Ecology Group (PEG) model. Significant deviations of the Lake Hume successional pattern from the PEG model included maxima for phytoplankton abundance being in winter and the presence of a clear water phase without large zooplankton grazers. The instability of the water level in Lake Hume probably causes the dynamics of most planktonic populations to be less predictable, but did not initiate the declining trends that have been observed in some other Australian reservoirs. Both the PEG model and the present study suggest that hydrology is one of the major drivers of seasonal succession.

Morphology, physiology and AFLP markers validate that green box is a hybrid of Eucalyptus largiflorens and E. gracilis (Myrtaceae)

2013 ◽  
Vol 26 (2) ◽  
pp. 156 ◽  
Author(s):  
Georgia R. Koerber ◽  
Peter A. Anderson ◽  
Jack V. Seekamp
Keyword(s):  
Nitrogen Isotope ◽  
Aflp Markers ◽  
Putative Hybrid ◽  
Hybrid Index ◽  
Length Polymorphisms ◽  
Murray River ◽  
Species Specific ◽  
Mature Stands ◽  
Physiological Characters ◽  
Green Box

Prolonged drought and salinity on the Chowilla floodplain of the Murray River have caused deterioration of E. largiflorens F.Muell. A putative hybrid with E. gracilis F.Muell, green box, withstands the saline conditions. We aimed to substantiate that green box is a hybrid and to test for agreement between morphological and physiological characters with amplified fragment length polymorphisms (AFLP). Mature stands were measured for leaf, trunk, floral, cotyledon, carbon and nitrogen isotope discrimination, specific leaf area (SLA) and AFLP. Green box was placed between E. largiflorens and E. gracilis according to categorical principal components analysis (CATPCA) of 21 morphological and physiological characters and character states. The hybrid index of 11 AFLP markers that were 78% species specific separated E. gracilis and E. largiflorens, and the majority of green box plants displayed indices ranging from 0.42 to 0.53, reflecting mostly additive inheritance. Calculation of the hybrid index with all 232 AFLP markers, using maximum likelihood, similarly placed green box between E. gracilis and E. largiflorens. Our morphological, physiological and AFLP-marker observations substantiated that green box is a hybrid between E. largiflorens and E. gracilis.

scholarly journals The effect of water level on lateral movements of fish between river and off-channel habitats and implications for management

2010 ◽  
Vol 61 (3) ◽  
pp. 271 ◽  
Author(s):  
Jarod Lyon ◽  
Ivor Stuart ◽  
David Ramsey ◽  
Justin O'Mahony
Keyword(s):  
Water Level ◽  
Fish Community ◽  
Life History Strategy ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Main River Channel ◽  
Murray River ◽  
Wetland Biodiversity ◽  
Eastern Australia ◽  
Riverine Wetland

Off-channel habitats, such as wetlands and backwaters, are important for the productivity of river systems and for many species of native fish. This study aimed to investigate the fish community, timing and cues that stimulated movement to and from off-channel habitats in the highly regulated Lake Hume to Lake Mulwala reach of the Murray River, south-eastern Australia. In 2004–05, 193 712 fish were collected moving bi-directionally between a 50-km section of the Murray River and several off-channel habitats. Lateral fish movements approximated water level fluctuations. Generally as water levels rose, fish left the main river channel and moved into newly flooded off-channel habitats; there was bi-directional movement as water levels peaked; on falling levels fish moved back to the permanent riverine habitats. Fish previously classified as ‘wetland specialists’, such as carp gudgeons (Hypseleotris spp.), have a more flexible movement and life-history strategy including riverine habitation. The high degree of lateral movement indicates the importance of habitat connectivity for the small-bodied fish community. Wetlands adjacent to the Murray River are becoming increasingly regulated by small weirs and ensuring lateral fish movement will be important in maintaining riverine-wetland biodiversity.

scholarly journals Optimal dynamic water allocation: Irrigation extractions and environmental tradeoffs in the Murray River, Australia

2011 ◽  
Vol 47 (12) ◽  
Author(s):  
R. Quentin Grafton ◽  
Hoang Long Chu ◽  
Michael Stewardson ◽  
Tom Kompas
Keyword(s):  
Water Allocation ◽  
Murray River ◽  
Optimal Dynamic

Murray River Country

Perma/Culture ◽  
2018 ◽  
pp. 53-65
Author(s):  
Camille Roulière
Keyword(s):  
Murray River

Seasonal Forecasts of Unregulated Inflows into the Murray River, Australia

2013 ◽  
Vol 27 (8) ◽  
pp. 2747-2769 ◽  
Author(s):  
David E. Robertson ◽  
Q. J. Wang
Keyword(s):  
Seasonal Forecasts ◽  
Murray River

Aboriginal Educators’ Training Program 1981-82

1982 ◽  
Vol 10 (2) ◽  
pp. 42-43
Author(s):  
D. Tournier
Keyword(s):  
Training Program ◽  
Primary Schools ◽  
Public Speaking ◽  
New South ◽  
Writing Skills ◽  
Child Psychology ◽  
Teaching Techniques ◽  
South Wales ◽  
Murray River ◽  
Aboriginal History

Every Wednesday we have a training program for Aboriginal educators in Swan Hill, which is situated on the New South Wales and Victorian border near the Murray River. The Aboriginal educators involved in this program are: Jon Kirby, Caroline Steel, Lynette Bugeja and myself. This program is co-ordinated by our resource teacher – Jill Pattenden.In 1981 we covered such subjects as reading and writing skills, communication, teaching techniques, lesson planning, Aboriginal history, child psychology, counselling, lessons in organising, oral history, community and alcohol, public speaking, submission drafting, study of Aboriginal spirituality.All these subjects were studied with the help of people in the community, both Aboriginal and European. These resource people included local elders, field officers, counsellors, psychologists, an alcohol counsellor, teachers, and people with tribal experience.As part of the program we did activity days at local primary schools. These days are called Jemauraji days (which means “today’s dreaming”). They consisted of different activities such as ground drawing, damper making, corroborée, totems and fire making. Everybody in each school was involved in these activities.

A comparative study of in-river geophysical techniques to define variations in riverbed salt load and aid managing river salinization

Geophysics ◽  
2010 ◽  
Vol 75 (4) ◽  
pp. WA135-WA147 ◽  
Author(s):  
Michael Hatch ◽  
Tim Munday ◽  
Graham Heinson
Keyword(s):  
River Flow ◽  
Relative Effectiveness ◽  
Sampling Interval ◽  
Southeastern Australia ◽  
Transient Electromagnetic ◽  
Conductivity Structure ◽  
Murray River ◽  
Conductive Substrate ◽  
Geophysical Techniques ◽  
Depth Of Investigation

Increased interest in the character of sediments at the base of waterways, for the purpose of managing river salinization, has led to the application of several geophysical techniques for collecting information from this zone. These instream methods are based on established ground and airborne electrical and electromagnetic technologies, including towed transient electromagnetic systems, towed direct current resistivity array systems, and frequency-domain helicopter electromagnetic systems. Although these systems are individually successful, a systematic examination of their relative effectiveness for identifying variations in substrate conductivity for a common stretch of a river remains lacking. We have compared results obtained from data collected using three instream geophysical techniques for a common stretch of the Murray River in southeastern Australia. The Murray River is an important water resource for drinking and agricultural purposes. Data from these surveys were acquired tolocate areas of significant saltwater accession to the Murray from a saline regional groundwater system that discharges into it. The three methods indirectly inform on those reaches that most likely contribute to higher salt loads in the river, and they do this through the identification of a conductive substrate (a gaining reach). For a [Formula: see text] stretch of the river, the methods identified similar variations in the conductivity structure of sediment substrate, although differences were observed in the modeled response relating to intrinsic differences between each system, including the sampling interval and resolution. The helicopter electromagnetic (EM) system is capable of acquiring hundreds of kil-ometers of data in a day, under any river flow condition, from near the river surface to depths in excess of [Formula: see text]. The other two techniques require safe river flow conditions for acquisition, with as much as 50 river km of data per day possible. The ground-based methods had enhanced lateral and vertical resolving capabilities relative to the helicopter EM system, but their depth of investigation was less (usually only [Formula: see text]).

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