Life History of the Australian Grayling, Prototroctes maraena (Salmoniformes: Prototroctidae) in the Tambo River, Victoria

Berra, Tim M.

doi:10.2307/1444089

Cited by 30 publications

(32 citation statements)

References 5 publications

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“…There are hints that habitat perturbations associated with managed river flows may be significantly contributing to a decline in the species' abundance, specifically, that lowered water temperatures, perhaps associated with a rise in water flow levels, might be implicated in stimulating spawning, and that temperatures are being influenced by flow management and water abstraction (Berra 1982;Hall and Harrington 1989;Mahoney 2000, 2004).…”

Section: The Australian Grayling Prototroctes Maraenamentioning

confidence: 99%

Crying wolf, crying foul, or crying shame: alien salmonids and a biodiversity crisis in the southern cool-temperate galaxioid fishes?

McDowall

2006

Rev Fish Biol Fisheries

273

292

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Section: The Australian Grayling Prototroctes Maraenamentioning

confidence: 99%

Crying wolf, crying foul, or crying shame: alien salmonids and a biodiversity crisis in the southern cool-temperate galaxioid fishes?

McDowall

2006

Rev Fish Biol Fisheries

273

292

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“…However, since flow interruptions during the construction of Tallowa Dam caused large fish mortalities (Bishop and Bell, 1978), only one Australian grayling has been recorded from the river system downstream of the dam (R. Faragher, NSW Fisheries, unpublished data; Harris and Gehrke, 1997). The reasons for the decline of this species downstream are uncertain, but lack of access to upstream habitats, large mortalities during dam construction, and reduced availability of pools and gravel beds believed to be used as spawning habitats (Berra, 1982;McDowall, 1996) are important contributing factors.…”

Section: Changes In Downstream Community Structurementioning

confidence: 99%

Changes in fish communities of the Shoalhaven River 20 years after construction of Tallowa Dam, Australia

Gehrke¹,

Gilligan²,

Barwick³

2002

River Research & Apps

185

133

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This study was undertaken as part of a long-term investigation of the ability of high-level fishways to rehabilitate fish communities upstream of high dams. Effects of Tallowa Dam on fish of the Shoalhaven River system were studied by comparing species abundances, population size-structures and the structure of fish communities above and below the dam. Fish were sampled twice yearly for two years at 12 sites throughout the catchment. Species richness was greater downstream of the dam, with 21 species, compared to 16 species upstream of the dam. Ten diadromous species are believed to be extinct above the dam because of obstructed fish passage. Another four migratory species capable of climbing the wall have reduced abundances upstream. Accumulations of fish, particularly juveniles, directly below the dam were evident for nine species. Fish communities upstream and downstream of the dam differed significantly, identifying the dam as a significant discontinuity in the available fish habitats within the system. Historical evidence suggests that before the dam was built, fish communities from the tidal limit to at least 130 m elevation were largely continuous. This study has demonstrated that Tallowa Dam is a major barrier to fish migration and has had adverse effects on the biodiversity of the system. The creation of Lake Yarrunga by Tallowa Dam has resulted in distinctive fish communities in riverine and lacustrine habitats. Populations of five species that occur both upstream and downstream of the dam have developed differences in their size structures. The fish community downstream of the dam also differs from its historical condition because of the virtual disappearance of Australian grayling (Prototroctes maraena) and the establishment of non-native species.A high-level fishway is now being designed for the dam to restore fish passage. Data from this study will serve as a baseline against which to assess the effectiveness of the fishway in rehabilitating fish communities of the river system.

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“…The direct observations of Bishop & Bell (1978), Berra (1982) and Bacher & O'Brien (1989) made it clear that connectivity between the freshwater adult habitat and the sea is essential to the viability of the species, whilst the observations of Koster et al (2013) demonstrate the importance of maintaining connectivity between upstream adult habitats and the spawning grounds in the lower freshwater reaches. The whole-of-lifetime salinity histories inferred 620 using otolith chemistry analysis confirmed that diadromy is obligatory, thus explaining why Australian grayling do not occur above major instream barriers (Gehrke et al 2002).…”

Section: The Australian Graylingmentioning

confidence: 99%

Human effects on ecological connectivity in aquatic ecosystems: Integrating scientific approaches to support management and mitigation

Crook

Lowe

Allendorf

et al. 2015

Science of The Total Environment

157

109

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Highlights: Human effects on ecological connectivity in aquatic ecosystems are reviewed. 40 Threats include: habitat loss, altered hydrology, invasive species, climate change. Case studies show improved understanding from multi-disciplinary approaches. Data on autecology, population structure, movement and physiology are critical. Planning requires data synthesis across life histories and temporal/spatial scales. AbstractUnderstanding the drivers and implications of anthropogenic disturbance of ecological connectivity is a key concern for the conservation of biodiversity and 50 ecosystem processes. Here, we review human activities that affect the movements and dispersal of aquatic organisms, including damming of rivers, river regulation, habitat loss and alteration, human-assisted dispersal of organisms and climate change.Using a series of case studies, we show that the insight needed to understand the nature and implications of connectivity, and to underpin conservation and 55 management, is best achieved via data synthesis from multiple analytical approaches.We identify four key knowledge requirements for progressing our understanding of the effects of anthropogenic impacts on ecological connectivity: autecology; population structure; movement characteristics; and environmental tolerance/phenotypic plasticity. Structuring empirical research around these four 60 broad data requirements, and using this information to parameterise appropriate models and develop management approaches, will allow for mitigation of the effects of anthropogenic disturbance on ecological connectivity in aquatic ecosystems.

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Life History of the Australian Grayling, Prototroctes maraena (Salmoniformes: Prototroctidae) in the Tambo River, Victoria

Cited by 30 publications

References 5 publications

Crying wolf, crying foul, or crying shame: alien salmonids and a biodiversity crisis in the southern cool-temperate galaxioid fishes?

Crying wolf, crying foul, or crying shame: alien salmonids and a biodiversity crisis in the southern cool-temperate galaxioid fishes?

Changes in fish communities of the Shoalhaven River 20 years after construction of Tallowa Dam, Australia

Human effects on ecological connectivity in aquatic ecosystems: Integrating scientific approaches to support management and mitigation

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