The impact and management of exotic dune grasses near the mouth of the Murray River, South Australia

Hilton, Michael J.; Harvey, Nick; James, Kris

doi:10.1080/14486563.2007.10648720

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…Despite being protected and relatively isolated since they are separated from the mainland by an extensive lagoon, the dunefields have undergone moderate human pressure in the past (Paton, ). Pastoral activities and especially the introduction of invasive species of fauna and flora such as European rabbits ( Oryctolagus cuniculus ), have changed the landscape of the YP and its dunefilied to various degrees (Hilton et al, ; Mutze et al, ; Paton, ).…”

Section: Study Sitementioning

confidence: 99%

“…This area was selected for two reasons; one, it is the section of the peninsula with the largest number of available historical aerial photographs, enabling the quantification of long‐term changes in vegetation every ~7 years on average, and, two, this section is representative of the entire transgressive dune system. The presence of largely active dunes in the first aerial photographs (1949), also means that historical pastoral activities were minimal (Hilton et al, ; Paton, ), thus having less impact on the vegetation and landscape than in other areas of the dune system.…”

Section: Study Sitementioning

confidence: 99%

“…Another factor that could have contributed to vegetation changes in the YP was the presence of exotic pioneer plants (Hilton et al, ; James, ). Due to natural and deliberate introduction, exotic plants are present along the YP dune system.…”

Section: Potential Driving Factors Of Vegetation Changementioning

confidence: 99%

“…Sea‐wheat grass ( Thinopyrum junceiforme ) in particular, has been proven to have impacted the stabilization of the dunes to some extent. Sea‐wheat grass established almost along the entire YP coastline post‐1978, causing significant displacement of Spinifex and possibly other native species, and changing the dunefield morphology by (i) forming significant incipient foredunes and ii) therefore restricting sediment movement inland on some sections of the coast leading to the stabilization of blowouts in foredunes (Hilton et al, ; James, ; Levin et al, ). Although sea‐wheat grass has likely contributed to the observed changes in vegetation cover, the incipient foredune is a very minor part of the much larger dunefield examined in this study.…”

Section: Potential Driving Factors Of Vegetation Changementioning

confidence: 99%

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Changes in vegetation cover on the Younghusband Peninsula transgressive dunefields (Australia) 1949–2017

Moulton

Hesp

Silva

et al. 2018

Earth Surf Processes Landf

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Studies have shown that the impact of climate change, human and animal actions on coastal vegetation can turn stabilized dunes into active mobile dunes and vice versa. Yet, the driving factors that trigger vegetation changes in coastal dunes are still not fully understood. In the transgressive dunefields of the Younghusband Peninsula (south‐east coast of South Australia) historical aerial photographs show an increase in vegetation cover over the last ~70 years. This study attempts to identify the causes of the changes in vegetation cover (1949 to 2017) observed in a typical section of the coastal dune systems of the Peninsula. Vegetation cover was first estimated for various years using the available historical aerial photography (long‐term changes – 1949 to 2017) and recent satellite imagery (short‐term annual changes – 2010 to 2017) for the area, and then results were discussed against the observed changes in climatic variables and rabbit density, factors that could have played a role in this transformation. Results of long‐term changes show that the vegetation cover has increased significantly from 1949 to 2017, from less than 7% vegetation cover to almost 40%, increasing dune stabilization and forming parabolic dune systems. Periods with the largest growth in vegetation cover (1952‐1956 and 2009‐2013) coincide with a significant decline in rabbit numbers. Rabbit density was found to be the primary factor linked to the rapid vegetation growth and stabilization of the dunefield, for both decadal long‐term (last 68 years) and annual short‐term changes (last 8 years). Other factors such as changes in rainfall, aeolian sediment transport, land use practices, and the introduction of invasive plants have apparently played a limited to negligible role in this stabilization process. © 2018 John Wiley & Sons, Ltd.

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Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Section: Potential Driving Factors Of Vegetation Changementioning

confidence: 99%

Section: Potential Driving Factors Of Vegetation Changementioning

confidence: 99%

See 2 more Smart Citations

Changes in vegetation cover on the Younghusband Peninsula transgressive dunefields (Australia) 1949–2017

Moulton

Hesp

Silva

et al. 2018

Earth Surf Processes Landf

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“…villosa is endemic to SA; E. villosa var. maximensis is reported as invasive in both Australia and New Zealand (Hilton et al 2007). Ehrharta calycina native to southern Africa has been introduced to at least 17 countries around the world (North and South America, Europe, and Australasia; Calflora 2013, http://www.calflora.org/ accessed 28 Aug 2015) including western Australia, with most records in the Perth area (CABI 2015 http://www.cabi.org/isc accessed 28 Aug 2015), as well as in four other states (Blood 2001).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Ergot species of the Claviceps purpurea group from South Africa

et al. 2016

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Flow dynamics over a foredune scarp

Piscioneri

Smyth

Hesp

2019

Earth Surf Processes Landf

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The nature of wind flow over a small, 0.6 m high foredune scarp is investigated on the Sir Richard Peninsula, South Australia during a variety of incident wind directions and speeds. The study provides additional supporting evidence that the presence of the scarp and the dune exerts a strong influence on a landwards trending reduction in wind velocity and an increase in turbulence, with the greatest area of turbulence occurring near and at the foredune scarp base. For an incident oblique wind, an alongshore helicoidal flow is formed within a separation region along the scarp basal region. In this region, the coefficient of variation (CV) of wind speed is high and displays significant fluctuations. The flow at the scarp crest is compressed, streamlined and accelerated, turbulence is suppressed, and local jets may occur depending on the incident wind approach angle. Jets are more likely where the incident flow is perpendicular or nearly so. A flow separation region does not develop downwind of the scarp crest where the morphology of the foredune stoss slope downwind of the scarp is more convex (as in this case) rather than relatively flat, and possibly due to the presence of vegetation at the scarp crest. A tentative model of the flow regions developed across a backshore–scarp–foredune region during oblique incident flow is provided. © 2018 John Wiley & Sons, Ltd.

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The impact and management of exotic dune grasses near the mouth of the Murray River, South Australia

Cited by 7 publications

References 7 publications

Changes in vegetation cover on the Younghusband Peninsula transgressive dunefields (Australia) 1949–2017

Changes in vegetation cover on the Younghusband Peninsula transgressive dunefields (Australia) 1949–2017

Ergot species of the Claviceps purpurea group from South Africa

Flow dynamics over a foredune scarp

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