Ecological risks and opportunities from engineered artificial flooding as a means of achieving environmental flow objectives

Bond, Nick; Costelloe, Justin F.; King, Alison J.; Warfe, Danielle M.; Reich, Paul; Balcombe, Stephen Richard

doi:10.1890/130259

Cited by 81 publications

(50 citation statements)

References 49 publications

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“…The Australian freshwater ecosystem is under threat from human impacts such as land degradation, pollution with fertilisers and biocides from adjacent agricultural pastures, dams and introduction of exotic species (Arthington et al 2010, Barrett et al 2014, Bond et al 2014. However, the impact of disease on the survival of native fauna could have an equally detrimental influence, especially if anthropogenic stressors work in synergy to reduce the immune functions of the animals in question (Gray et al 2009, Robert 2010.…”

Section: Discussionmentioning

confidence: 99%

Pathogenicity in six Australian reptile species following experimental inoculation with Bohle iridovirus

Ariel¹,

Wirth²,

Burgess³

et al. 2015

Dis. Aquat. Org.

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Ranaviruses are able to infect multiple species of fish, amphibian and reptile, and some strains are capable of interclass transmission. These numerous potential carriers and reservoir species compound efforts to control and contain infections in cultured and wild populations, and a comprehensive knowledge of susceptible species and life stage is necessary to inform such processes. Here we report on the challenge of 6 water-associated reptiles with Bohle iridovirus (BIV) to investigate its potential pathogenicity in common native reptiles of the aquatic and riparian fauna of northern Queensland, Australia. Adult tortoises Elseya latisternum and Emydura krefftii, snakes Boiga irregularis, Dendrelaphis punctulatus and Amphiesma mairii, and yearling crocodiles Crocodylus johnstoni were exposed via intracoelomic inoculation or co-habitation with infected con-specifics, but none were adversely affected by the challenge conditions applied here. Bohle iridovirus was found to be extremely virulent in hatchling tortoises E. latisternum and E. krefftii via intracoelomic challenge, as demonstrated by distinct lesions in multiple organs associated with specific immunohistochemistry staining and a lethal outcome (10/17) of the challenge. Virus was re-isolated from 2/5 E. latisternum, 4/12 E. krefftii and 1/3 brown tree snakes B. irregularis. Focal necrosis, haemorrhage and infiltration of granulocytes were frequently observed histologically in the pancreas, liver and sub-mucosa of the intestine of challenged tortoise hatchlings. Immunohistochemistry demonstrated the presence of ranavirus antigens in the necrotic lesions and in individual cells of the vascular endothelium, the connective tissue and in granulocytes associated with necrosis or present along serosal surfaces. The outcome of this study confirms hatchling tortoises are susceptible to BIV, thereby adding Australian reptiles to the host range of ranaviruses. Additionally, given that BIV was originally isolated from an amphibian, our study provides additional evidence that interclass transmission of ranavirus may occur in the wild.

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Section: Discussionmentioning

confidence: 99%

Pathogenicity in six Australian reptile species following experimental inoculation with Bohle iridovirus

Ariel¹,

Wirth²,

Burgess³

et al. 2015

Dis. Aquat. Org.

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“…These emerging factors demand new perspectives, renewed research effort, and innovation beyond established approaches to the science and management of water for the environment Stoffels et al, 2018;Thompson et al, 2018;Webb et al, 2018). There is also the recognition that there are many flow regime options for a river beyond trying to restore the natural or historical flow regime (e.g., Acreman et al, 2014b;Bond et al, 2014;Poff et al, 2017). Further, choosing between options requires a clear articulation of visions and goals, as well as a capacity to predict the expected outcomes (physical, ecological, societal, economic) from each environmental flow strategy.…”

Section: Introductionmentioning

confidence: 99%

The Brisbane Declaration and Global Action Agenda on Environmental Flows (2018)

Arthington

Bhaduri

Bunn

et al. 2018

Front. Environ. Sci.

337

225

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“…For example, under natural flow conditions, many large floodplain lakes and wetlands would have been filled by overbank (sheet) flows, allowing lateral connectivity between the river and floodplain. Currently, it is common for environmental flows to be used to inundate these floodplain water bodies, specifically to enhance the condition of associated biota (Bond et al 2014). Infrastructure (including pumps, levees and channels) is used to efficiently direct environmental water allocations into these water bodies.…”

Section: Transparency and Translucency Rules (T And T Rules)mentioning

confidence: 99%

“…Infrastructure (including pumps, levees and channels) is used to efficiently direct environmental water allocations into these water bodies. However, although it is common to provide a sufficient volume of water to inundate the water body, often there is not enough water to ensure any return flow (see Bond et al 2014 for examples). Alternatively, there may be a reluctance to allow return flow from the floodplain because of the perceived risk of poor water-quality outcomes in the receiving water (see discussion in the following section).…”

Section: Transparency and Translucency Rules (T And T Rules)mentioning

confidence: 99%

“…The loss of lateral connectivity between rivers and their floodplains has altered not just water movement, but also the flux of materials and energy (nutrients and carbon) and biota (plant propagules and animals) from and to the river (Bond et al 2014). Consequently, the export of DOC from floodplain ecosystems to the main river channel is likely to have been substantially reduced.…”

Section: Introductionmentioning

confidence: 99%

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Restoring dissolved organic carbon subsidies from floodplains to lowland river food webs: a role for environmental flows?

Baldwin

Colloff

Mitrovic

et al. 2016

Mar. Freshwater Res.

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Abstract. Environmental flows are managed events in river systems designed to enhance the ecological condition of aquatic ecosystems. Although not traditionally seen as important in lowland rivers, there is mounting evidence that terrestrial subsidies can be an important energy source in aquatic metazoan food webs. We argue that the apparent lack of importance of terrestrial subsidies to many lowland river food webs may reflect an artefact resulting from historical anthropogenic changes to lowland river-floodplain ecosystems, including the loss of lateral connectivity between rivers and their floodplains, changes in floodplain land use and carbon stores, and loss of sites of transformation within the main channel. The loss of floodplain subsidies to the main river channel can be partially redressed using environmental flows; however, this will require mimicking important aspects of natural high-flow events that have hitherto been overlooked when targeting environmental flows to a limited suite of biota. We suggest that key biotic targets for environmental flow releases may not be achievable unless river-floodplain subsidies are sufficiently restored. Environmental flows can go some way to addressing this shortfall, but only if floodplain subsidies to river channels are explicitly included in the design and management of environmental flows.

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Ecological risks and opportunities from engineered artificial flooding as a means of achieving environmental flow objectives

Cited by 81 publications

References 49 publications

Pathogenicity in six Australian reptile species following experimental inoculation with Bohle iridovirus

Pathogenicity in six Australian reptile species following experimental inoculation with Bohle iridovirus

The Brisbane Declaration and Global Action Agenda on Environmental Flows (2018)

Restoring dissolved organic carbon subsidies from floodplains to lowland river food webs: a role for environmental flows?

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