Edith Cowan University

About: Edith Cowan University is a education organization based out in Perth, Western Australia, Australia. It is known for research contribution in the topics: Population & Context (language use). The organization has 4040 authors who have published 13529 publications receiving 339582 citations. The organization is also known as: Edith Cowan & ECU.

Crossover clustering and rapid decay of linkage disequilibrium in the Xp/Yp pseudoautosomal gene SHOX.

Abstract: Crossover between the human sex chromosomes during male meiosis is restricted to the terminal pseudoautosomal pairing regions. An obligatory exchange occurs in PAR1, an Xp/Yp pseudoautosomal region of 2.6 Mb, which creates a male-specific recombination 'hot domain' with a recombination rate that is about 20 times higher than the genome average1,2,3. Low-resolution analysis of PAR1 suggests that crossovers are distributed fairly randomly4. By contrast, linkage disequilibrium (LD)5 and sperm crossover analyses6 indicate that crossovers in autosomal regions tend to cluster into 'hot spots' of 1–2 kb that lie between islands of disequilibrium of tens to hundreds of kilobases7. To determine whether at high resolution this autosomal pattern also applies to PAR1, we have examined linkage disequilibrium over an interval of 43 kb around the gene SHOX8. Here we show that in northern European populations, disequilibrium decays rapidly with physical distance, which is consistent with this interval of PAR1 being recombinationally active in male meiosis. Analysis of a subregion of 9.9 kb in sperm shows, however, that crossovers are not distributed randomly, but instead cluster into an intense recombination hot spot that is very similar in morphology to autosomal hot spots. Thus, PAR1 crossover activity may be influenced by male-specific hot spots that are highly suitable for characterization by sperm DNA analysis.

The state of Australia's avifauna: a personal opinion and prediction for the new millennium

Abstract: A consequence of the European colonization of Australia has been a significant loss of biodiversity: one in four mammal species is either extinct or threatened. In contrast, only one species of bird has been lost from the Australian continent and there is less concern for the survival of the Australian avifauna than for mammals. This is despite the fact that nearly one in five bird species is listed as threatened or of "special concern". Moreover, a review of the status of Australian birds at local, regional, state and continental scales shows that the impact of Europeans on the avifauna is much greater than acknowledged. Over most of southern Australia entire avifaunas are threatened with extinction. When allowance is made for habitat loss and degradation, 30 to 90% of bird species across the continent have declined in abundance. The extent of this decline is that the survival of many bird species in the 21st Century is threatened. While a majority of birds in southern Australia has declined in abundance and/or distribution, others have increased. Parallel changes are proceeding in northern Australia. In terms of evaluating impact on the avifauna, an increase in numbers and a change in the composition of avian communities are as significant as the loss of populations and species. Both adversely affect patterns of continental biodiversity and are ecologically dysfunctional. Assuming that current trends continue, over the next century, significant components of the avifauna will be lost as populations proceed to extinction and the composition of avifaunas change at scales ranging from the local to the continental. The pattern of change in avian abundances, and the failure to anticipate or acknowledge the major losses of birds on the Australian continent, shows that conservation emphasis needs to shift from a species by species approach to the conservation of communities and entire avifaunas. Taken together, the scale of the changes in the distribution and abundance of Australian birds is an affirmation that present and projected patterns of human use of the Australian continent are not sustainable. Much needs to be done to reverse the decline of the terrestrial avifauna and achieve ecological sustainability in land use. The most urgent actions are to end the clearing of native vegetation, reduce grazing pressure, remove inappropriate fire regimes, control feral and native animals whose abundance threatens native species, and restore functional ecosystems, with an emphasis on native vegetation, to a minimum of 30% of the landscape. These need to be accompanied by an aggressive programme to improve water quality in fresh water habitats and restore environmental water flows, and the creation of a comprehensive, adequate and representative reserve system across the continent irrespective of land tenure. In the absence of such action, I predict that Australia will lose half of its terrestrial bird species in the next century.