Antarctic Legacy Archive

Climate change impacts on the terrestrial biodiversity of Marion Island

Show simple item record en_ZA McGeoch, M.A.
dc.coverage.spatial en_ZA
dc.coverage.spatial sub-Antarctic
dc.coverage.spatial Marion Island 2021-02-23T19:05:09Z 2021-02-23T19:05:09Z 2007/10/09 2007/10/09
dc.description.abstract Observed and predicted impacts of global climate change on terrestrial biota include changes in individual performance, idiosyncratic species responses and as a consequence community reassembly, species range shifts and a change in the form and strength of species interactions-1 3 However, generalizations that have been drawn about species responses to global change in many cases have a strong northern­ hemisphere bias as a consequence of the comparative dearth of austral studies. The sub-Antarctic Prince Edward Islands are experiencing levels of climate change greater than the global average, in common with other parts of polar regions3. The biotic response hypotheses listed above were tested on Marion Island focusing predominantly on a keystone plant species (Azorella selago, Apiaceae) and its associated epiphytes and microarthropods. A combination of mensurate, natural climate gradient and field-experiment approaches were used to quantify both aspects of climate and species responses. A number of biologically-relevant changes in Marion Islands' climate were identified, including longer dry spells and an increase in the frequency of high evaporation events4. The temperature of the western side of the island was shown to be temperate in comparison with the eastern side5, and both plant and microarthropod community characteristics were indeed shown to differ between island sides6. Responses to the altitudinal climate gradient on the island have also been shown in the microarthropod community and in the form of interspecific interactions in the plant community6 7. Both A. selago and springtail species responded negatively to experimental warming and drying, with comparatively idiosyncratic species-level responses8 9. To date there is thus strong evidence for the climate-sensitivity of Marion Islands' fauna and flora based on historical and current patterns of biotic variation across the island, as well as manipulative field experiments. Future multidisciplinary studies that include physiology, genetics, biogeomorphology and climate modelling will enable system-level understanding and a predictive glimpse of Marion Island under a future climate. en_ZA
dc.description.sponsorship Sponsored by the Department of Science and Innovation(DSI) through the National Research Foundation (South Africa) en_ZA
dc.description.statementofresponsibility Antarctic Legacy of South Africa en_ZA
dc.format PDF en_ZA
dc.format PDF en_ZA
dc.language English en_ZA
dc.language.iso en_ZA en_ZA
dc.publisher en_ZA
dc.publisher South African National Antarctic Programme (SANAP) en_ZA
dc.relation en_ZA
dc.relation SANAP Symposium 2007 en_ZA
dc.relation.ispartof en_ZA
dc.relation.ispartof ARESSA THEME III: Biodiversity: Responses to Earth System Variability (Oral Presentations) en_ZA
dc.rights Copyright. en_ZA
dc.rights Copyright en_ZA
dc.subject SANAP Symposium 2007 en_ZA
dc.subject sub-Antarctic en_ZA
dc.subject Marion Island en_ZA
dc.subject Terrestrial Science en_ZA
dc.subject Living Systems en_ZA
dc.subject Research en_ZA
dc.subject Climate Change en_ZA
dc.subject Biodiversity en_ZA
dc.subject Ecology en_ZA
dc.subject Biota en_ZA
dc.title Climate change impacts on the terrestrial biodiversity of Marion Island en_ZA
dc.type Abstracts en_ZA
dc.rights.holder McGeoch, M.A. en_ZA
iso19115.mdconstraints.uselimitation This item and the content of this website are subject to copyright protection. Reproduction of the content, or any part of it, other than for research, academic or non-commercial use is prohibited without prior consent from the copyright holder. en_ZA
iso19115.mddistributor.distributorcontact South African National Antarctic Programme (SANAP) en_ZA PDF en_ZA
iso19115.mdidentification.deliverypoint Antarctic Legacy of South Africa, Faculty of Science, Private Bag X1, Matieland. Stellenbosch. South Africa. en_ZA
iso19115.mdidentification.electronicmailaddress en_ZA
iso19115.mdidentification.organizationname en_ZA
iso19115.mdidentification.organizationname Stellenbosch University en_ZA

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