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Articles 1 - 7 of 7
Full-Text Articles in Medicine and Health Sciences
Antarctic Climate Change And The Environment: An Update, John Turner, Nicholas E. Barrand, Thomas J. Bracegirdle, Peter Convey, Dominic A. Hodgson, Martin Jarvis, Adrian Jenkins, Gareth Marshall, Michael P. Meredith, Howard Roscoe, Jon Shanklin, John French, Hugues Goosse, Mauro Guglielmin, Julian Gutt, Stan Jacobs, Marlon C. Kennicutt, Valerie Masson-Delmotte, Paul Mayewski, Francisco Navarro, Sharon A. Robinson, Ted Scambos, Mike Sparrow, Colin Summerhayes, Kevin Speer, Alexander Klepikov
Antarctic Climate Change And The Environment: An Update, John Turner, Nicholas E. Barrand, Thomas J. Bracegirdle, Peter Convey, Dominic A. Hodgson, Martin Jarvis, Adrian Jenkins, Gareth Marshall, Michael P. Meredith, Howard Roscoe, Jon Shanklin, John French, Hugues Goosse, Mauro Guglielmin, Julian Gutt, Stan Jacobs, Marlon C. Kennicutt, Valerie Masson-Delmotte, Paul Mayewski, Francisco Navarro, Sharon A. Robinson, Ted Scambos, Mike Sparrow, Colin Summerhayes, Kevin Speer, Alexander Klepikov
Sharon Robinson
We present an update of the 'key points' from the Antarctic Climate Change and the Environment (ACCE) report that was published by the Scientific Committee on Antarctic Research (SCAR) in 2009. We summarise subsequent advances in knowledge concerning how the climates of the Antarctic and Southern Ocean have changed in the past, how they might change in the future, and examine the associated impacts on the marine and terrestrial biota. We also incorporate relevant material presented by SCAR to the Antarctic Treaty Consultative Meetings, and make use of emerging results that will form part of the Intergovernmental Panel on Climate …
Spatial Co-Registration Of Ultra-High Resolution Visible, Multispectral And Thermal Images Acquired With A Micro-Uav Over Antarctic Moss Beds, Darren Turner, Arko Lucieer, Zbynek Malenovsky, Diana H. King, Sharon A. Robinson
Spatial Co-Registration Of Ultra-High Resolution Visible, Multispectral And Thermal Images Acquired With A Micro-Uav Over Antarctic Moss Beds, Darren Turner, Arko Lucieer, Zbynek Malenovsky, Diana H. King, Sharon A. Robinson
Sharon Robinson
In recent times, the use of Unmanned Aerial Vehicles (UAVs) as tools for environmental remote sensing has become more commonplace. Compared to traditional airborne remote sensing, UAVs can provide finer spatial resolution data (up to 1 cm/pixel) and higher temporal resolution data. For the purposes of vegetation monitoring, the use of multiple sensors such as near infrared and thermal infrared cameras are of benefit. Collecting data with multiple sensors, however, requires an accurate spatial co-registration of the various UAV image datasets. In this study, we used an Oktokopter UAV to investigate the physiological state of Antarctic moss ecosystems using three …
Alien Grass Disrupts Reproduction And Post-Settlement Recruitment Of Co-Occurring Native Vegetation: A Mechanism For Diversity Decline In Invaded Forest?, Ben Gooden, Kris French, Sharon A. Robinson
Alien Grass Disrupts Reproduction And Post-Settlement Recruitment Of Co-Occurring Native Vegetation: A Mechanism For Diversity Decline In Invaded Forest?, Ben Gooden, Kris French, Sharon A. Robinson
Sharon Robinson
Invasive plants significantly threaten native plant biodiversity, yet the mechanisms by which they drive species losses and maintain their own dominance are poorly known. We examined the effects of alien grass invasion (Stenotaphrum secundatum) on (1) abundance and frequency of occurrence, (2) reproductive effort (flowering) and output (fruit production) and (3) soil seed banks for three focal native plants that are characteristic of endangered coastal forest of south-eastern Australia. First, we sampled and compared the foliage cover abundance and frequency (proportion of sites occupied) of the focal natives across invaded and non-invaded (reference) sites (n = 20). We then intensively …
Solar Ultraviolet Radiation In A Changing Climate, Craig E. Williamson, Richard G. Zepp, Robyn M. Lucas, Sasha Madronich, Amy T. Austin, Carlos L. Ballare, Mary Norval, Barbara Sulzberger, Alkiviadis F. Bais, Richard L. Mckenzie, Sharon A. Robinson, Donat -P Hader, Nigel D. Paul, Janet F. Bornman
Solar Ultraviolet Radiation In A Changing Climate, Craig E. Williamson, Richard G. Zepp, Robyn M. Lucas, Sasha Madronich, Amy T. Austin, Carlos L. Ballare, Mary Norval, Barbara Sulzberger, Alkiviadis F. Bais, Richard L. Mckenzie, Sharon A. Robinson, Donat -P Hader, Nigel D. Paul, Janet F. Bornman
Sharon Robinson
The projected large increases in damaging ultraviolet radiation as a result of global emissions of ozone-depleting substances have been forestalled by the success of the Montreal Protocol. New challenges are now arising in relation to climate change. We highlight the complex interactions between the drivers of climate change and those of stratospheric ozone depletion, and the positive and negative feedbacks among climate, ozone and ultraviolet radiation. These will result in both risks and benefits of exposure to ultraviolet radiation for the environment and human welfare. This Review synthesizes these new insights and their relevance in a world where changes in …
Sunsafe Bryophytes: Photoprotection From Excess And Damaging Solar Radiation, Sharon A. Robinson, Melinda J. Waterman
Sunsafe Bryophytes: Photoprotection From Excess And Damaging Solar Radiation, Sharon A. Robinson, Melinda J. Waterman
Sharon Robinson
Whilst light is essential for photosynthesis and development of plants, both excess photosynthetically active radiation and certain wavelengths (e.g. high energy ultraviolet-B) radiation can be damaging. Plants in general possess a suite of mechanisms that act to either prevent absorption of damaging and excess radiation or to mitigate against the damage that such radiation can cause once it is absorbed. Whilst bryophytes share many of these photoprotective mechanisms with the vascular plants, there are key differences in the photoprotection available to bryophytes. Some of these differences pertain to structural features, such as protective epidermal layers, that are available to vascular …
Dominating The Antarctic Environment: Bryophytes In A Time Of Change, Jessica Bramley-Alves, Diana H. King, Sharon A. Robinson, Rebecca E. Miller
Dominating The Antarctic Environment: Bryophytes In A Time Of Change, Jessica Bramley-Alves, Diana H. King, Sharon A. Robinson, Rebecca E. Miller
Sharon Robinson
Polar ecosystems, and particularly Antarctica, are one of the few environs in which bryophytes dominate the flora. Their success in these regions is due to bryophytes’ ability to withstand an array of harsh conditions through their poikilohydric lifestyle. However, the unique conditions that allow bryophytes to proliferate over other forms of vegetation also create considerable limitations to growth and photosynthetic activity. High latitude areas are already experiencing some of the most pronounced and rapid climatic change, especially in the Arctic, the Sub-Antarctic Islands and Maritime Antarctica, and these are predicted to continue over the next century. This climatic change is …
Integrating Transient Heterogeneity Of Non-Photochemical Quenching In Shade-Grown Heterobaric Leaves Of Avocado (Persea Americana L.): Responses To Co2 Concentration, Stomatal Occlusion, Dehydration And Relative Humidity, Kotaro Takayama, Diana King, Sharon A. Robinson, Barry Osmond
Integrating Transient Heterogeneity Of Non-Photochemical Quenching In Shade-Grown Heterobaric Leaves Of Avocado (Persea Americana L.): Responses To Co2 Concentration, Stomatal Occlusion, Dehydration And Relative Humidity, Kotaro Takayama, Diana King, Sharon A. Robinson, Barry Osmond
Sharon Robinson
Long-lived shade leaves of avocado had extremely low rates of photosynthesis. Gas exchange measurements of photosyn- thesis were of limited use, so we resorted to Chl fluorescence imaging (CFI) and spot measurements to evaluate photosyn- thetic electron transport rates (ETRs) and non-photochem- ical quenching (NPQ). Imaging revealed a remarkable transient heterogeneity of NPQ during photosynthetic in- duction in these hypostomatous, heterobaric leaves, but was adequately integrated by spot measurements, despite long-lasting artifacts from repeated saturating flashes during assays. Major veins (mid-vein, first- and second-order veins) defined areas of more static large-scale heterogeneous NPQ, with more dynamic small-scale heterogeneity most strongly …