Ten compactness properties of circles: measuring shape in geography

This essay sheds new light on the meaning and measurement of compactness—one of the most intriguing and least‐understood properties of geographic shapes. We articulate a unified theoretical foundation for the study of shape compactness that rests on two simple observations: First, that the circle is the most compact of shapes. And second, that there are 10—and possibly more—distinct geometrical properties of the circle that make it the most compact of shapes. We introduce these 10 properties, illustrate them with real‐world examples and define indices associated with these properties that can be calculated using a geographic information system.     

Spatial and Temporal Patterns of Recreational Angling Effort in a Warm‐Temperate Australian Estuary

Among the critical issues for the management of estuarine fish resources is the need to adequately identify the extent of use by recreational fishers, and the allocation of the resource between recreational and commercial users. Recreational anglers in estuaries often target a similar range of estuarine fish species to commercial fishers. Prior to the declaration of ‘recreational fishing havens’ (estuarine waters closed to commercial netting but remaining open to recreational angling) in many New South Wales (NSW) estuaries in May 2002, the estuary of the Manning River on the central NSW coast supported the tenth most productive commercial estuarine net fishery in the State. To quantify the recreational angling effort in the Manning River estuary, progressive counts were made of shore‐based and boat‐based anglers from a small power boat from June 2001 to May 2002. Sample days (eight per month) were chosen in a stratified random fashion, taking into account the proportions of weekends, public holidays and school holidays in each month. The total recreational angling effort exerted on the estuary for the 12‐month period was 144 892 ± 3248 angler‐hours, indicating a low to medium effort compared to other NSW estuaries of similar size. Over half of the effort was exerted in the section nearest the northern entrance at Harrington. There was relatively little variation in shore‐based angling effort throughout the year, whereas boat‐based fishing increased markedly in summer. Months that coincided with NSW school holidays were most popular, especially January. More recreational fishing effort was exerted in the afternoons than in the mornings during winter, but this trend was reversed in summer. Although daily effort was much higher on weekends than weekdays, the total cumulative effort was generally similar, due to the greater number of weekdays in the year. Pilot studies of catch per unit effort indicate that the recreational catch in the Manning River estuary is probably small compared to the pre‐closure commercial catch. Therefore management strategies aimed at limiting the recreational catch are likely to have minimal impact on fish stocks in the estuary when compared with regulation of the commercial sector.     

Reconciliation and research in Afghanistan: an analytical narrative

This article examines the evolution of western policy towards the idea of pursuing negotiations with the Taliban, or ‘reconciliation’, in Afghanistan and the role that research and expert opinion played in that process. The official western position has evolved iteratively from initial rejection to near complete embrace of exploring the potential for talks. It is widely assumed that the deteriorating security situation was the sole determinant of this major policy reversal, persuading decision‐makers to rethink what had once been deemed unthinkable. Moreover, given the politicized and sensitive nature of the subject, we might expect the potential for outside opinion to influence decision‐makers to be low. Nevertheless, this article demonstrates that it would be a mistake to underestimate the role that research and expert knowledge played—the story is more nuanced and complex. Research coalesced, sometimes prominently, with other key drivers to spur and shape policy change. Importantly, it often took experts to make sense of events on the ground, especially where the failure of the military approach was not recognized, understood or palatable to those in official circles. Research interacted with changing events, policy windows, the emergence of new personalities and the actions of various intermediaries to shape emerging positions. More broadly, the case of reconciliation in Afghanistan reveals the difficulties and challenges, but also the variety of opportunities and techniques, for achieving research influence in conflict‐affected environments.