Dynamic Assessment of Oceanic Connectivity in a Coastal Lagoon—the Coorong, Australia

Webster, Ian T.

doi:10.2112/jcoastres-d-10-00079.1

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…Freshwater flow interacts with marine sediments at the mouth of estuaries. Turbulent wave action in the coastal surf zone resuspends sediments which are transported by flood tides and deposited in the mouths of estuaries, forming sand bars (Webster 2010;Whitfield et al, 2012). Scouring by freshwater flows can reduce sand bar development and maintain a connection to the sea (#3c Figure 1; Kjerfve, 1994;Webster, 2010;Whitfield et al, 2012).…”

Section: Sediment Dynamicsmentioning

confidence: 99%

“…Turbulent wave action in the coastal surf zone resuspends sediments which are transported by flood tides and deposited in the mouths of estuaries, forming sand bars (Webster 2010;Whitfield et al, 2012). Scouring by freshwater flows can reduce sand bar development and maintain a connection to the sea (#3c Figure 1; Kjerfve, 1994;Webster, 2010;Whitfield et al, 2012). An open connection to the sea allows for flushing of sediments, nutrients and contaminants out of the estuary (Adams et al, 2020).…”

Section: Sediment Dynamicsmentioning

confidence: 99%

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Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes

Chilton

Hamilton

Nagelkerken

et al. 2021

Front. Environ. Sci.

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Estuaries host unique biodiversity and deliver a range of ecosystem services at the interface between catchment and the ocean. They are also among the most degraded ecosystems on Earth. Freshwater flow regimes drive ecological processes contributing to their biodiversity and economic value, but have been modified extensively in many systems by upstream water use. Knowledge of freshwater flow requirements for estuaries (environmental flows or E-flows) lags behind that of rivers and their floodplains. Generalising estuarine E-flows is further complicated by responses that appear to be specific to each system. Here we critically review the E-flow requirements of estuaries to 1) identify the key ecosystem processes (hydrodynamics, salinity regulation, sediment dynamics, nutrient cycling and trophic transfer, and connectivity) modulated by freshwater flow regimes, 2) identify key drivers (rainfall, runoff, temperature, sea level rise and direct anthropogenic) that generate changes to the magnitude, quality and timing of flows, and 3) propose mitigation strategies (e.g., modification of dam operations and habitat restoration) to buffer against the risks of altered freshwater flows and build resilience to direct and indirect anthropogenic disturbances. These strategies support re-establishment of the natural characteristics of freshwater flow regimes which are foundational to healthy estuarine ecosystems.

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Section: Sediment Dynamicsmentioning

confidence: 99%

Section: Sediment Dynamicsmentioning

confidence: 99%

Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes

Chilton

Hamilton

Nagelkerken

et al. 2021

Front. Environ. Sci.

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“…In these systems, geomorphological processes originate geoforms (e.g., lagoons, mouths and channels), which are habitats with different physical attributes (e.g., depth, width, substrate) that influence the patterns of composition, richness, abundance, migration and the size-specific spatial use by organisms (Bartholomew et al, 2000;Saintilan, 2004;Franco et al, 2006;França et al, 2009; _________________ Corresponding editor: Yassir Torres Hicks et al, 2010). For example, the mouth and its tidal channels are ecotones connecting the marine with the brackish environment (Webster, 2011;Lacerda et al, 2014). Furthermore, other geoforms such as lagoons, which are partially enclosed areas with low water circulation and more structural complexity (e.g., muddy bottoms, riverine and submerged vegetation), are reported as critical habitat for juvenile fish feeding and nurseries (Neves et al, 2013;Verdiell-Cubedo et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

The influence of habitat on the spatio-temporal dynamics of fish assemblages in a lagoon-estuarine system of the Mexican Pacific

Romero-Berny

Velázquez-Velázquez

Schmitter‐Soto

et al. 2020

Lat. Am. J. Aquat. Res.

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Fish assemblages change significantly with physical and chemical characteristics of water; however, their response to the variability of geomorphic habitats has been rarely evaluated in lagoon-estuarine in one of these systems of the Mexican Pacific. Spatio-temporal variation of fish assemblage structure was assessed for three habitats: lagoon, estuarine, channel and inlet. The hypothesis was that sheltered areas support comparatively higher richness and abundance of fish species, with more small-sized specimens than the most exposed areas. We found that the ichthyofauna differed significantly among habitats. Several species were smaller in the lagoon compared with the other habitats, suggesting a use of the lagoon as a nursery ground. Moreover, dominant species for the lagoon were rarely found or absent in the inlet, whereas others were found only present or with higher abundance in the inlet. Although seasonal differences in richness and composition were detected, the evidence of fish-habitat associations for many species was noticeable regardless of seasonality, probably due to a high percentage of resident species during the annual cycle. The lagoon supports a greater abundance and species richness, due to a more sheltered and structured habitat, evidencing habitat-driven segregation in fish assemblages, and an aspect that should be incorporated for management of coastal ecosystems.

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Drought and flood effects on macrobenthic communities in the estuary of Australia's largest river system

Dittmann

Baring

Baggalley

et al. 2015

Estuarine, Coastal and Shelf Science

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Dynamic Assessment of Oceanic Connectivity in a Coastal Lagoon—the Coorong, Australia

Cited by 5 publications

References 20 publications

Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes

Environmental Flow Requirements of Estuaries: Providing Resilience to Current and Future Climate and Direct Anthropogenic Changes

The influence of habitat on the spatio-temporal dynamics of fish assemblages in a lagoon-estuarine system of the Mexican Pacific

Drought and flood effects on macrobenthic communities in the estuary of Australia's largest river system

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