Aquatic and Littoral Vegetation

Nicol, Jason; Gehrig, Susan; Ganf, George G.; Paton, David C.

doi:10.20851/natural-history-cllmm-3.2

Cited by 2 publications

(7 citation statements)

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“…Although S. tabernaemontani appears to be relatively resilient to drought conditions, having survived the Millennium Drought and subsequent low water levels by resprouting from rhizomes after normal water levels returned to Lake Alexandrina and Lake Albert (Nicol et al ), a variety of factors may influence the persistence of this species. These include nutrient increases (Escutia‐Lara & Lindig‐Cisneros ), droughts and subsequent wetland drying (Catford et al ) and access to the shoreline by livestock and livestock grazing (Vanderbosch & Galatowitsch ).…”

Section: Discussionmentioning

confidence: 99%

“…In our study, it is most likely that planted S. tabernaemontani caused a breakwater effect, reducing wave energy into the shore, and allowing suspended sediment to settle between the planted vegetation and the shoreline (Gedan et al ; Fairweather et al ). This then provided a low energy environment for aquatic plants to recolonize (Vanderbosch & Galatowitsch ; Nicol et al ).…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, aquatic plants associated with young plantings and control sites were usually semiaquatic, and were more adapted to open habitats (Sainty & Jacobs ). The high incidence of open water in these habitats also suggests that it takes longer than 3 years for S. tabernaemontani plantings to form a breakwater effect (Nicol et al ). Thus, old plantings are able to create a low wave energy environment between S. tabernaemontani and the shoreline that allows native emergent, submergent, floating, and amphibious species to become established (Sainty & Jacobs ; Nicol et al ).…”

Section: Discussionmentioning

confidence: 99%

“…It is a common emergent species around the edges of freshwater and brackish lakes, but unlike other large emergent plant species such as Phragmites australis and Typha domingensis it does not form dense monospecific stands (Hudon et al ; Gehrig et al ). Schoenoplectus tabernaemontani usually grows in deeper water than T. domingensis and P. australis (Sainty & Jacobs ) and is often associated with submergent taxa such as Myriophyllum spp., Potamogeton spp., Ceratophyllum demersum , and Vallisneria australis (Gehrig & Nicol ; Nicol et al ).…”

Section: Methodsmentioning

confidence: 99%

“…Schoenoplectus tabernaemontani occurs naturally along the shorelines of Lake Alexandrina and Lake Albert and had been planted by community organizations since 1996 to reduce shoreline erosion (K. Strother 2015, Goolwa to Wellington Local Action Planning Community Group, personal communication). After the Millennium Drought the Department of Environment, Water and Natural Resources (DEWNR) continued this work (2011 onwards) as S. tabernaemontani could be planted in relatively deep water (up to 1 m depth), did not form dense homogenous stands and was thought to reduce erosion risk and increase shoreline biodiversity (Nicol et al ). Initially S. tabernaemontani was propagated by taking remnant plant clumps into a nursery, dividing the clumps into individual stems and growing them in hessian pots.…”

Section: Methodsmentioning

confidence: 99%

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Facilitating the restoration of aquatic plant communities in a Ramsar wetland

Jellinek

Gehrig

et al. 2016

Restoration Ecology

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Human activities such as land clearing and intensive land use around water bodies, particularly wetlands, have a detrimental impact on water quality and quantity, aquatic plant communities, and associated wetland fauna. Lake Alexandrina and Lake Albert are internationally significant Ramsar wetlands located at the terminus of the Murray River, Australia's longest river system. Agriculture, water regulation, and extraction and droughts have had a detrimental impact on native plant communities in the lakes. We studied the influence of young (<1-3 years) and old (8-11 years) plantings of a native sedge (bulrush), Schoenoplectus tabernaemontani, to facilitate the establishment of aquatic plant communities in comparison with remnant and control sites. We also measured how planting structure (height, stand width, and stem density) changed with age in comparison with remnant sites. Results suggest that as plantings age they get substantially wider and have a greater maximum height, although do not reach similar stand widths by 11 years when compared to remnant areas. However, old plantings do not differ from remnant habitats in relation to aquatic plant species richness, counts of aquatic plants, and community composition. Young plantings have substantially less abundant and diverse plant communities, but are developing on a similar trajectory to old plantings. It is likely that planting sedges along lake shorelines causes a breakwater effect that facilitates the recolonization of wetland plants between the planted area and the water's edge. Management agencies should consider restoring native sedges to increase aquatic biodiversity, and potentially reduce erosion.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Facilitating the restoration of aquatic plant communities in a Ramsar wetland

Jellinek

Gehrig

et al. 2016

Restoration Ecology

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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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Aquatic and Littoral Vegetation

Cited by 2 publications

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Facilitating the restoration of aquatic plant communities in a Ramsar wetland

Facilitating the restoration of aquatic plant communities in a Ramsar wetland

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

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