The Spatial Ecology of Power: Long-Distance Trade and State Formation in Northeast Africa

2011 ◽  
Vol 24 (2) ◽  
pp. 155-185 ◽  
Author(s):  
FOUAD MAKKI
1973 ◽  
Vol 14 (1) ◽  
pp. 29-43 ◽  
Author(s):  
R. S. O'Fahey

The institutions of slavery, slave raiding and the slave trade were fundamental in the rise and expansion of the Keira Sultanate of Dār Fūr. The development of a long-distance trade in slaves may be due to immigrants from the Nile, who probably provided the impetus to state formation. This process may be remembered in the ‘Wise Stranger’ traditions current in the area. The slave raid or ghazwa, penetrating into the Baḥr al-Ghazāl and what is now the Central African Republic, marked the triumph of Sudanic state organization over the acephalous societies to the south.The slaves, who were carefully classified, were not only exported to Egypt and North Africa, but also served the sultans and the title-holding elite as soldiers, labourers and bureaucrats. In the latter role, the slaves began to encroach on the power of traditional ruling groups within the state; the conflict between the slave bureaucrats and the traditional ruling elite lasted until the end of the first Keira Sultanate in 1874.


Author(s):  
Helena Hamerow

In contrast to the relative scarcity of publications dealing with the buildings and layouts of rural settlements, many volumes have been devoted to the development of early medieval trade and craft production (e.g. Jankuhn et al. 1981; 1983; K. Düwel et al. 1987, vols. 1–4; Hodges and Whitehouse 1983). Archaeological research into these topics has been made more fruitful—as well as more complex—by the contributions of neighbouring disciplines such as history, geography, and numismatics. It has, however, tended to focus almost exclusively on towns, monasteries, and royal centres, yet craft production, trade, and exchange also played a significant role in farming communities before and after the emergence of such specialized centres. Indeed, the rural settlements of northwest Europe were already significantly differentiated in their economies in the Migration period, suggesting a high level of socio-economic complexity several centuries earlier than has generally been supposed. The evidence now available for trade and non-agrarian production, which derives almost wholly from archaeology, calls for a thoroughgoing reassessment of when and how centralized authorities emerged in northern Europe after the collapse of the western Empire. This is particularly true for northern Germany and southern Scandinavia, where early state formation has conventionally been dated to the late Viking period. Research into state formation has in the past focused on the origins of towns and market centres, the latter usually seen as arising from participation in long-distance trade which was controlled by kings or magnates. Yet, several centuries before there were kings or towns in northern Europe, rural settlements emerged which point to a degree of political centralization. This chapter considers the evidence for these rural centres and the role of non-agrarian production and exchange in rural settlements generally: what was the scale and context of the production, distribution, and consumption of non-agrarian goods? Who controlled these activities, and how, if at all, did the long-distance trade networks which fuelled the nascent towns of Merovingian and Viking Age Europe affect the economies of the communities which lay in their hinterlands?


2005 ◽  
Vol 21 (6) ◽  
pp. 605-612 ◽  
Author(s):  
Gregory P. Brown ◽  
Richard Shine ◽  
Thomas Madsen

The extent, sequence, synchrony and correlates of diel displacements by animals can provide powerful insights into the ecological and social factors that shape an organism's day-to-day activities, but detailed data on spatial ecology are available for very few tropical taxa. Radiotelemetric monitoring of 25 slatey-grey snakes (Stegonotus cucullatus) on a floodplain in the Australian wet-dry tropics for periods of 40 to 355 d (mean=195 d, 136 locations per snake) provided extensive information on habitat use, movement patterns and home range size of these large slender-bodied colubrids. All radio-tracked animals were nocturnal, sheltering by day in soil cracks and beneath tree roots and debris. Snakes did not appear to move between 61% of successive locations and timing of movements was not synchronized among snakes. Most displacements were small (<50m), with males moving further and more often than did females. However, nesting females made occasional long-distance movements, travelling 100–400m to forested areas to oviposit but then returning to their usual home ranges. Snakes of both sexes moved further and more often during the wet-season than the dry-season. Snakes typically moved on a few successive nights then remained sedentary for the next few days, apparently reflecting cessation of activity as soon as a meal was obtained. Home ranges were small (2.9–7.4 ha) and most snakes remained in the same area throughout the year, providing a strong contrast in this respect to the large and seasonally dynamic home ranges of sympatric acrochordid and pythonid snakes.


2014 ◽  
Vol 41 (7) ◽  
pp. 571 ◽  
Author(s):  
Christine Groom ◽  
Kris Warren ◽  
Anna Le Souef ◽  
Rick Dawson

Context Studying interactions between a wildlife species and its spatial environment can enable a deeper understanding of its ecology. Studies of spatial ecology are generally undertaken by attaching tracking devices to selected individuals and following their movements. Highly mobile species, such as black cockatoos (Calyptorhynchus spp.), that occupy habitats with patchy resources are ideal candidates. The powerful beak and chewing habits of black cockatoos make it difficult to successfully attach tracking devices to them. Aims We developed a safe technique for attaching tracking devices to black cockatoos and assessed the impact of the tracking devices, as well as their performance in relation to battery life, retention time and accuracy of location fixes. Methods We describe a technique for attaching Telonics (Mesa, AZ, USA) Argos Avian Transmitter TAV 2617 tracking devices to the two central tail feathers of black cockatoos. Key results Of 26 tracking devices fitted (24 to Carnaby’s cockatoos, C. latirostris; two to Baudin’s cockatoos, C. baudinii), 20 exhibited longer retention time than the nominal battery life. One tracking device was chewed until it was non-functional before release and two were presumed chewed after release because their tracking devices failed prematurely. There was no evidence that the tracking devices inhibited the flight capability of cockatoos. The performance of the Argos tracking devices exceeded expectations with regard to retention times, battery life and overall accuracy of location fixes. The tracking devices enabled detection of instances of rapid long-distance movements, including one bird that travelled 70 km between night roosts while migrating. Most study birds (68%) remained within 50 km of their release sites while monitored. Conclusion The tracking devices were a suitable choice for black cockatoos and for the purpose of this study. They posed minimal snag risk, were of suitable dimensions for tail attachment and they enabled data to be collected even if birds dispersed long distances. The main limitations that must be considered when assessing their suitability for future research projects are the errors associated with location fixes, limited retention time in relation to moulting of tail feathers and limited battery life. Implications The development of a method for successfully attaching tracking devices to black cockatoos opens the possibility to study aspects of the ecology of black cockatoos and other highly mobile species that was not previously possible.


Author(s):  
Christopher Scull

Conventional models of state formation and the ways in which early polities might be expressed in the archaeological record for England in the 7th century have emphasised the importance of long-distance exchange in promoting socio-economic complexity. Such models, however, are open to challenge or refinement from interpretations that would emphasise other social dynamics, and beg serious questions about the relationships between agrarian production, elite acquisition and consumption and structures of power and jurisdiction. This chapter presents a critical evaluation of some current assumptions and approaches, and examines the interpretative questions in the light of recent evidence from south-east Suffolk, often seen as the heartland of the early kingdom of the East Angles.


Antiquity ◽  
2013 ◽  
Vol 87 (338) ◽  
pp. 1136-1150 ◽  
Author(s):  
Gordon Noble ◽  
Meggen Gondek ◽  
Ewan Campbell ◽  
Murray Cook

The development of small-scale kingdoms in the post-Roman world of northwestern Europe is a key stage in the subsequent emergence of medieval states. Recent excavations at Rhynie in north-eastern Scotland have thrown important light on the emergence of one such kingdom, that of the Picts. Enclosures, sculptured ‘symbol stones’ and long-distance luxury imports identify Rhynie as a place of growing importance during the fifth to sixth centuries AD. Parallels can be drawn with similar processes in southern Scandinavia, where leadership combined roles of ritual and political authority. The excavations at Rhynie and the synthesis of dated Pictish enclosures illustrate the contribution that archaeology can make to the understanding of state formation processes in early medieval Europe.


Author(s):  
James Cronshaw

Long distance transport in plants takes place in phloem tissue which has characteristic cells, the sieve elements. At maturity these cells have sieve areas in their end walls with specialized perforations. They are associated with companion cells, parenchyma cells, and in some species, with transfer cells. The protoplast of the functioning sieve element contains a high concentration of sugar, and consequently a high hydrostatic pressure, which makes it extremely difficult to fix mature sieve elements for electron microscopical observation without the formation of surge artifacts. Despite many structural studies which have attempted to prevent surge artifacts, several features of mature sieve elements, such as the distribution of P-protein and the nature of the contents of the sieve area pores, remain controversial.


VASA ◽  
2012 ◽  
Vol 41 (4) ◽  
pp. 262-268 ◽  
Author(s):  
Schweizer ◽  
Hügli ◽  
Koella ◽  
Jeanneret

On the occasion of diagnosing a popliteal entrapment syndrome in a 59-year old man with no cardiovascular risk factors, who developed acute ischemic leg pain during long distance running, we give an overview on this entity with emphasis on patients’age. The different types of the popliteal artery compression syndrome are summarized. The diagnostic and therapeutic approaches are discussed. The most important clinical sign of a popliteal entrapment syndrome is the lack of atherosclerotic risk factors in patients with limited walking distance. Not only in young athletes but also in patients more than 50 years old the popliteal entrapment syndrome has to be taken into account.


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