Development of Trigger Levels to Assess Catchment Disturbance on Stream Suspended Sediment Loads in the Magela Creek Catchment,Northern Territory,Australia

Trigger levels for fine suspended sediment (FSS) load in streams are required to identify rainfall-runoff events that have significantly elevated FSS loads, compared with expected background loads, as a result of catchment disturbance. Stream FSS load data collected in the mine-impacted Magela Creek catchment in the wet-dry tropics were used to derive water quality management trigger levels for two approaches – a Before-After-Control-Impact Paired difference design (BACIP) and a regression relationship between observed FSS load and corresponding event discharge characteristics. The results indicate that both the BACIP and regression relationship approaches behave similarly, with similar FSS load events elevated above trigger levels. Notwithstanding this, it is recommended that in order to reliably assess the location and magnitude of a catchment disturbance on FSS load, a combination of BACIP and regression relationship approaches must be adopted. In this study, an event with a FSS load above trigger levels associated with both BACIP and the regression relationship fitted for the downstream site is considered to be significantly elevated as a result of a disturbance within the mine-impacted region. While this technique cannot conclusively determine whether the cause of the disturbance is mine-related or natural (such as fire or bank erosion), it is an efficient statistical method of identifying events that warrant further investigation and management action, if required.     

A FIELD METHOD FOR INVESTIGATING the DISTRIBUTION of ROCK ART

Summary: Recent studies of prehistoric rock art have analysed its position in the landscape and have suggested that it played an important role in a mobile pattern of settlement. But the distribution of petroglyphs is usually taken as given, with the result that it is difficult to assess the significance of this kind of patterning. We argue that such evidence should be compared with the distribution of uncarved rocks across the surrounding area, and illustrate this procedure by two case studies from northern England. In these examples rock carvings were carefully sited at viewpoints and may have overlooked important routes across the landscape.     

SOME DEVELOPMENTS IN THE DIFFUSION PATTERNS OF HUTTERITE COLONIES

This paper describes some developments in the diffusion pattern of Hutterite colonies in North America. Today, there are more than 300 colonies distributed over the four western provinces of Canada and five states of the United States. The spatial behaviour of the three Hutterite clan-groups is compared, and responses by the sects to the repeal of the Alberta Communal Property Act in 1973 are assessed. Finally, changes in the rate of diffusion and the management of colony division are examined.
Cette communication décrit quelques développements dans la diffusion des colonies ďHutterites en Amérique du Nord. Aujourd'hui, il y a plus de 300 colonies dispersées dans les quatre provinces de ľoeust canadien et dans cinq états américains. Nous comparons le comportement spatial des trois groupes, ou clans, principaux ďHutterites et nous évaluons les réactions des sectes àľabrogation de la législation, de 1973, de la loi pourtant sur la possession en commun de propriétés Finalement. on examine le gérance de la division des colonies, et les changements dans leurs taux de diffusion.     

Recreational Fishing in Australia: Review and Policy Issues

Recreational fishing, otherwise known as angling, is both a significant resource use and a leisure activity in Australia. It has not received much scientific or policy attention, having been perceived as unimportant relative to commercial fishing and characterised by poor social, biological and economic data. Attention is increasing, however, as the ecological, economic and social significance of the activity is realised. The article briefly reviews recreational fishing and discusses the reasons why the activity has traditionally been ignored by policy-makers and researchers. Current policy issues are identified, and a generalised framework suggested for policy and research.     

Disadvantage and ‘Otherness' in Western Sydney

The construction of western Sydney as Sydney's ‘other’ has played a role in its historic underprovision of human services compared to the Sydney region as a whole. Issues of difference, disadvantage, identity and the representations of western Sydney are analysed for their contribution to its provision of services, with planning for higher education given as an example. Some service provision decisions seem to based on a notion of innate disadvantage rather than disadvantage brought about by structural inequities. These structural inequities include the historical underprovision of human services. An understanding of the ‘othering’ of western Sydney is necessary in order to prevent a vicious cycle of underprovision and disadvantage arising in the future.     

The Armada Tapestries in the Old Palace of Westminster

The tapestry series of the ‘Defeat of the Spanish Armada’ was a national artistic treasure which hung in the old Palace of Westminster from the mid 17th century until the fire of 1834. This article outlines the creation of the tapestries in the 1590s and covers the major treatments of them in illustrations of parliamentary interiors and in John Pine's 1739 engravings; it ends with a short account of the curious episode of the tapestry which escaped the conflagration. In the absence of any known historical record of how the tapestries were displayed, suggestions are offered about how many and in what order they hung in the two chambers occupied successively by the house of lords (before and after 1801), and about how they were physically supported on the walls of the Parliament Chamber.