Now showing items 1-10 of 34
Temperature- and body mass-related variation in cyclic gas exchange characteristics and metabolic rate of seven species: Broader implications
(PERGAMON-ELSEVIER SCIENCE LTD, 2005-07-01)
The influence of temperature on metabolic rate and characteristics of the gas exchange patterns of flightless, sub-Antarctic Ectemnorhinus-group species from Heard and Marion islands was investigated. All of the species ...
Climatic variability and hemispheric differences in insect cold tolerance: support from southern Africa
(BLACKWELL PUBLISHING, 2005-04-01)
1. Insects generally survive subzero temperatures by utilizing either freeze tolerance or freeze avoidance. Comparative analyses from a limited data set have indicated that freeze tolerance may be predominant among species ...
Biological invasions in the Antarctic: extent, impacts and implications
(CAMBRIDGE UNIV PRESS, 2005-02)
Alien microbes, fungi, plants and animals occur on most of the sub-Antarctic islands and some parts of the Antarctic continent. These have arrived over approximately the last two centuries, coincident with human activity ...
Nestedness of Southern Ocean island biotas: ecological perspectives on a biogeographical conundrum
(BLACKWELL PUBLISHING LTD, 2005-01)
Aim To use patterns of nestedness in the indigenous and non-indigenous biotas of the Southern Ocean islands to determine the influence of dispersal ability on biogeographical patterns, and the importance of accounting for ...
Testing for ecological and genetic allee effect in the invasive shrub Senna Diymobotrya (Fabaceae)
For an introduced plant species to become invasive, it must be able to reproduce even in initially small populations. We tested for Allee effects (reduced reproductive performance of individuals in small populations) in ...
Science and advocacy: the GM debate in South Africa
(ACAD SCIENCE SOUTH AFRICA A S S AF, 2005-02)
SOUTH AFRICA HAS AN EFFECTIVE regulatory framework for transgenics, and its rate of adopting genetic modification technology is amongst the highest in the world. However, the ecological consequences of introducing genetically ...
Neutrality and the niche
(BLACKWELL PUBLISHING LTD, 2005-02)
An exploratory analysis of geographic genetic variation in southern African nyala (Tragelaphus angasii)
(URBAN & FISCHER VERLAG, 2005)
We report patterns of genetic variation based on microsatellite, allozyme and mitochondrial control region markers in nyala from geographic locations sampled in South Africa, Mozambique, Malawi and Zimbabwe. Highly significant ...
The potential global geographical distribution of Citrus Black Spot caused by Guignardia citricarpa (Kiely): likelihood of disease establishment in the European Union
(ELSEVIER SCI LTD, 2005-04)
This study represents a climatic modelling approach towards assessing the risk that Citrus Black Spot (CBS) will spread to regions of the world where the disease does not occur. Globally, CBS is widespread, but is absent ...
Human impacts, energy availability and invasion across Southern Ocean Islands
(BLACKWELL PUBLISHING, 2005-11)
Aim Ongoing biological invasions will enhance the impacts of humans on biodiversity. Nonetheless, the effects of exotic species on diversity are idiosyncratic. Increases in diversity might be a consequence of similar ...