Estuarine Acidification: Impacts on Aquatic Biota of Draining Acid Sulphate Soils

Acid sulphate soils form when iron pyrite oxidises to sulphuric acid on atmospheric exposure, lowering soil pH below 4. In the Richmond River estuary, northern New South Wales, flood mitigation, drainage works and floodplain excavations have augmented acid sulphate soil formation by increasing pyrite availability for oxidation. These engineering works have facilitated the transport of acidified water and have impeded recovery from tributary acidification. The increased frequency and duration of acidification are associated with elevated concentrations of inorganic monomeric aluminium and dissolved iron, and major iron hydroxide precipitation, with deleterious effects on exposed aquatic biota and habitat. Fish kills and an outbreak of epizootic ulcerative syndrome (EUS) have been recorded from acidified sites in the estuary.     

Soft balancing among weak states? Evidence from Africa

Recent literature on the use of soft balancing to counter the hegemony of the United States has focused primarily on middle powers in Europe and rising powers such as China. But what about weak states? Do they simply go along with the hegemon, or do they challenge its policies despite the odds? And to what extent does the soft balancing argument explain their behaviour? In recent years, several historically friendly African countries have used non‐military means to undermine the unilateral policies of the United States. Leaders in South Africa, Kenya, Nigeria, Tanzania, Mali, Namibia and Niger especially have resisted US demands in areas such as the ‘war on terror’, the International Criminal Court and the US Africa Command. This article seeks to explain the strategies of opposition that some African countries have pursued. It finds that the behaviour is driven both by regional power concerns and by domestic political considerations. Interestingly, public opinion in these relatively democratic countries is motivated by disagreements with US policy and by resentment of the predominance of American power. Thus, the evidence both confirms and challenges the notion of soft balancing. On one hand, the behaviour of African states is driven at least in part by the global balance of power—directly, as leaders respond to power concerns within the continent, and indirectly, as citizens pressure leaders to resist the hegemon. On the other hand, these findings challenge the underlying premise that state behaviour is determined solely by structural concerns. Instead, the oppositional behaviour of African states has both systemic and domestic explanations.     

BRONZE AGE BARROWS ON THE HEATHLANDS OF SOUTHERN ENGLAND: CONSTRUCTION, FORMS AND INTERPRETATIONS

The Bronze Age barrows on the downs of southern England have been investigated and discussed for nearly 200 years, but much less attention has been paid to similar structures in the areas of heathland beyond the chalk and river gravels. They were built in a phase of expansion towards the end of the Early Bronze Age, and more were constructed during the Middle Bronze Age. They have a number of distinctive characteristics. This paper considers the interpretation of these monuments and their wider significance in relation to the pattern of settlement. It also discusses the origins of field systems in lowland England.     

The Second Ash Wednesday: 16 February 1983

A brief factual account of the events associated with bushfires in Australia on 16 February 1983 is provided. General information on the setting for the fires and their immediate impacts on South Australia and Victoria is followed by brief accounts of the major fire areas in South Australia. Finally some questions are raised on the vulnerability of the Australian community to bushfire disasters.