The recent decline in agricultural exports: is the exchange rate the culprit?

Exports ; Farm produce

The influence of stochasticity, landscape structure and species traits on abundant–centre relationships

Species have been commonly hypothesized to have high population densities in geographic areas which correspond to either the centre of the species geographic range or climatic niche (abundant–centre hypothesis). However, there is mixed empirical support for this relationship, and little theoretical underpinning. We simulate a species spreading across a set of replicated artificial landscapes to examine the expected level of support for abundant–centre relationships in geographic and niche space. Species niche constraints were modeled as a single axis which was related directly to population growth rates. We found strong evidence for abundant–centre relationships when populations follow deterministic growth, dispersal is high, environmental noise is absent and intraspecific competition is low. However, the incorporation of ecological realism reduced the detectability of abundant–centre relationships considerably. Our results suggest that even in carefully constructed artificial landscapes designed to demonstrate abundant–centre dynamics, the incorporation of small amounts of demographic stochasticity, environmental heterogeneity or landscape structure can strongly influence the relationship between species population density and distance to species geographic range or niche centre. While some simulated relationships were of comparable strength to common empirical support for abundant–centre relationships, our results suggest that these relationships are expected to be fairly variable and weak

Selecting an intermediate target for monetary policy

Monetary policy ; Money supply

Planning the post-political city: exploring public participation in the contemporary Australian city

This special section examines the possibility of meaningful debate and contestation over urban decisions and futures in politically constrained contexts. In doing so, it moves with the post-political times: critically examining the proliferation of deliber- ative mechanisms; identifying the informal assemblages of diverse actors taking on new roles in urban socio-spatial justice; and illuminating the spaces where informal and formal planning processes meet. These questions are particularly pertinent for understanding the processes shaping Australian cities and public participation today