Conclusion: change in terrestrial and marine systems

Chown, Steven L.; Froneman, P. William

doi:10.18820/9781928357063/14

Cited by 2 publications

(1 citation statement)

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“…This could result in the displacement of native species by the abundant invasive species (Terauds et al 2011), although the impacts on functional roles remains poorly understood. Finally, an increase in the frequency of low temperature events due to an increase in freezethaw cycles as a result of less snow and more clear-sky nights (Smith and Steenkamp 1990), are expected to alter the abundances and distribution of invertebrates species (Chown and Froneman 2008); this could indirectly affect assemblage-level function (Janion et al 2009).…”

Section: Terrestrial Invasionsmentioning

confidence: 99%

Biological Invasions in South Africa’s Offshore Sub-Antarctic Territories

Greve

Meden

Janion‐Scheepers

2020

Biological Invasions in South Africa

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The sub-Antarctic Prince Edward Islands (PEIs) constitute South Africa's most remote territory. Despite this, they have not been spared from biological invasions. Here, we review what is known about invasions to the PEIs for terrestrial taxa (vertebrates, invertebrates, plants and microbes), freshwater taxa and marine taxa. Currently, Marion Island is home to 46 alien species, of which 29 are known to be invasive (i.e. they are alien species that have established and spread on the island). Prince Edward Island, which has no permanent human settlement and is visited only infrequently, has significantly fewer alien species: only eight alien species are known from Prince Edward Island, of which seven are known to be invasive. The House Mouse (Mus musculus), which occurs on Marion Island, can be considered the most detrimental invader to the islands; it impacts on plants, insects and seabirds, which result in changes to ecosystem functioning. The impacts of other terrestrial invaders are less well understood. At present, no invasive freshwater or marine taxa are known from the PEIs. We conclude by discussing how invasion threats to the PEIs are changing and how the amelioration of the climate of the islands may increase invasion threats to both terrestrial and marine habitats. 8.1 Introduction South Africa's southernmost territory, the Prince Edward Islands (PEIs), consists of two islands: the larger Marion (~270 km 2), and the smaller Prince Edward (~45 km 2) Islands (Fig. 8.1a). The islands lie approximately 2000 km southeast of Cape Town,

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Section: Terrestrial Invasionsmentioning

confidence: 99%

Biological Invasions in South Africa’s Offshore Sub-Antarctic Territories

Greve

Meden

Janion‐Scheepers

2020

Biological Invasions in South Africa

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The surface geology of the Prince Edward Islands: refined spatial data and call for geoconservation

Rudolph

Hedding

Nel

2021

South African Journal of Geology

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Volcanological maps of the sub-Antarctic Prince Edward Islands were first published in 1968, with a revised surface geology map of Marion Island produced in 2006. These maps have been widely used in terrestrial studies on the Prince Edward Islands but they have limitations in spatial accuracy and detail. Using high-resolution satellite imagery and digital elevation data, more spatially accurate data for both Prince Edward and Marion Island’s surface geology are presented here. In particular, Marion Island’s volcanology on the western coast, including the 1980s lava flow, and the newly exposed Central Highland following the disappearance of extensive ice and snow cover is mapped with greater detail and verified through field observations. The spatial data are downloadable as ESRI layer packages, which can assist in future investigations of island biotic-abiotic processes and interactions and enable improvements in spatial modelling. In addition, this paper highlights geological features and specimens from the Prince Edward Islands as unique examples of geodiversity in a South African context. An overview of these features are provided in terms of their geoheritage value to enable a more comprehensive geoconservation strategy be incorporated into the Prince Edward Islands Management Plan.

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Conclusion: change in terrestrial and marine systems

Cited by 2 publications

References 52 publications

Biological Invasions in South Africa’s Offshore Sub-Antarctic Territories

Biological Invasions in South Africa’s Offshore Sub-Antarctic Territories

The surface geology of the Prince Edward Islands: refined spatial data and call for geoconservation

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