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Now showing items 1-17 of 17

    • Antarctic marine biodiversity and deep-sea hydrothermal vents 

      Chown, Steven L. (Public Library of Science -- PLOS, 2012-01)
      The diversity of many marine benthic groups is unlike that of most other taxa. Rather than declining from the tropics to the poles, much of the benthos shows high diversity in the Southern Ocean. Moreover, many species are ...

    • Critical thermal limits and their responses to acclimation in two sub-Antarctic spiders : Myro kerguelenensis and Prinerigone vagans 

      Jumbam, K. R.; Terblanche, J. S.; Deere, J. A.; Somers, M. J.; Chown, Steven L. (Springer-Verlag, 2008-01)
      Despite the relative richness of spider species across the Southern Ocean islands remarkably little information is available on their biology. Here, the critical thermal limits of an indigenous (Myro kerguelenensis, Desidae) ...

    • Critical thermal limits depend on methodological context 

      Terblanche, John S.; Deere, Jacques A.; Clusella-Trullas, Susana; Janion, Charlene; Chown, Steven L. (Royal Society of Publishing, 2007)
      A full-factorial study of the effects of rates of temperature change and start temperatures was undertaken for both upper and lower critical thermal limits (CTLs) using the tsetse fly, Glossina pallidipes. Results show ...

    • Evolutionary responses of discontinuous gas exchange in insects 

      White, Craig R.; Blackburn, Tim M.; Terblanche, John S.; Marais, Elrike; Gibernau, Marc; Chown, Steven L. (National Academy of Sciences, 2007-05)
      The discontinuous gas-exchange cycles (DGCs) observed in many quiescent insects have been a cause of debate for decades, but no consensus on their evolutionary origin or adaptive significance has been achieved. Nevertheless, ...

    • The extent and impacts of ungulate translocations : South Africa in a global context 

      Spear, Dian; Chown, Steven L. (Elsevier, 2009-02)
      Despite the apparent risks of the introduction of non-indigenous ungulates to biodiversity, relatively little is known globally about the pathways of introduction, propagule pressure and realized impacts of ungulate ...

    • The fynbos and succulent Karoo biomes do not have exceptional local ant richness 

      Braschler, Brigitte; Chown, Steven L.; Gaston, Kevin J. (Public Library of Science (PLoS), 2012-03)
      Background: The Fynbos (FB) and Succulent Karoo biomes (SKB) have high regional plant diversity despite relatively low productivity. Local diversity in the region varies but is moderate. For insects, previous work suggests ...

    • Hemispheric asymmetries in biodiversity : a serious matter of ecology 

      Chown, Steven L.; Sinclair, Brent J.; Leinaas, Hans P.; Gaston, Kevin J. (PLoS One, 2004-11)
      Penguins have been receiving a lot of bad press lately. They are considered somehow counter, spare, strange. Unlike most plant and animal groups, they do not show a peak of species richness towards the equator and a ...

    • Intraspecific body size frequency distributions of insects 

      Gouws, E. Jeanne; Gaston, Kevin J.; Chown, Steven L. (Public Library of Science -- PLoS, 2011-03)
      Although interspecific body size frequency distributions are well documented for many taxa, including the insects, intraspecific body size frequency distributions (IaBSFDs) are more poorly known, and their variation among ...

    • Investigating onychophoran gas exchange and water balance as a means to inform current controversies in arthropod physiology 

      Clusella-Trullas, Susan; Chown, Steven L. (The Company of Biologists, 2008-08)
      Several controversies currently dominate the fields of arthropod metabolic rate, gas exchange and water balance, including the extent to which modulation of gas exchange reduces water loss, the origins of discontinuous gas ...

    • Macrophysiology for a changing world 

      Chown, Steven L.; Gaston, Kevin J. (The Royal Society, 2008-07)
      The Millennium Ecosystem Assessment (MA) has identified climate change, habitat destruction, invasive species, overexploitation and pollution as the major drivers of biodiversity loss and sources of concern for human ...

    • Non-indigenous ungulates as a threat to biodiversity 

      Spear, D.; Chown, Steven L. (Wiley-Blackwell, 2009-07)
      Non-indigenous ungulate species pose a problem for conservation. They can be socially and economically valuable, but are also potentially harmful to biodiversity. Therefore, their introduction requires an explicit assessment ...

    • Phenotypic plasticity mediates climate change responses among invasive and indigenous arthropods 

      Chown, Steven L.; Slabber, Sarette; McGeoch, Melodie A.; Janion, Charlene; Leinaas, Hans Petter (Royal Society Pulishing, 2007-10)
      Synergies between global change and biological invasion have been identified as a major potential threat to global biodiversity and human welfare. The global change-type drought characteristic of many temperate terrestrial ...

    • South African research in the Southern Ocean : new opportunities but serious challenges 

      Treasure, Anne M.; Moloney, Coleen L.; Bester, Marthan N.; McQuaid, Christopher D.; Findlay, Ken P.; Best, Peter B.; Cowan, Don A.; De Bruyn, P. J. Nico; Dorrington, Rosemary A.; Fagereng, Ake; Froneman, P. William; Grantham, Geoff H.; Hunt, Brian P. V.; Meiklejohn, Ian; Pakhomov, Evgeny A.; Roychoudhury, Alakendra N.; Ryan, Peter G.; Smith, Valdon R.; Chown, Steven L.; Ansorge, Isabelle J. (Academy of Science of South Africa, 2013)
      South Africa has a long track record in Southern Ocean and Antarctic research and has recently invested considerable funds in acquiring new infrastructure for ongoing support of this research. This infrastructure includes ...

    • Springtail diversity in South Africa 

      Janion, Charlene; Bedos, Anne; Bengtsson, Jan; Deharveng, Louis; Janse Van Vuuren, Bettine; Leinaas, Hans Petter; Liu, Amy; Malmstrom, Anna; Porco, David; Chown, Steven L. (Academy of Science of South Africa (ASSAf), 2011-11)
      Despite their significance in soil ecosystems and their use for investigations of soil ecosystem functioning and in bioindication elsewhere, springtails (Collembola) have not been well investigated in South Africa. Early ...

    • Stable and fluctuating temperature effects on the development rate and survival of two malaria vectors, Anopheles arabiensis and Anopheles funestus 

      Lyons, Candic L.; Coetzee, Maureen; Chown, Steven L. (BioMed Central, 2013-04)
      Background: Understanding the biology of malaria vector mosquitoes is crucial to understanding many aspects of the disease, including control and future outcomes. The development rates and survival of two Afrotropical ...

    • Thermal limits of wild and laboratory strains of two African malaria vector species, Anopheles arabiensis and Anopheles funestus 

      Lyons, Candice L.; Coetzee, Maureen; Terblanche, John S.; Chown, Steven L. (BioMed Central, 2012-07)
      Abstract Background Malaria affects large parts of the developing world and is responsible for almost 800,000 deaths annually. As climates change, concerns have arisen as to how this vector-borne disease will be ...

    • Thermal tolerance in a south-east African population of the tsetse fly Glossina pallidipes (Diptera, Glossinidae) : implications for forecasting climate change impacts 

      Terblanche, John S.; Clusella-Trullas, Susana; Deere, Jacques A.; Chown, Steven L. (2008-01)
      For tsetse (Glossina spp.), the vectors of human and animal trypanosomiases, the physiological mechanisms linking variation in population dynamics with changing weather conditions have not been well established. Here, we ...