Investigation of the ‘canopy effect’ in the isotope ecology of temperate woodlands

Anomalously ¹³C-depleted carbon stable isotope values from closed forest ecosystems have been termed the ‘canopy effect’. Originally this was ascribed to recycling of depleted carbon from forest floor decomposition of organic material, although others have suggested that it is equally likely to be due to variations in leaf-level processes in response to increased shade. This depletion in the heavier carbon isotope is passed on to woodland herbivores feeding within the forest environments. A similar isotopic depletion has also been reported in the archaeological literature from more open temperate woodland settings, but no measurements have been made on the plants at the base of the food chain in order to quantify the effect. In this study we attempt this by examining the carbon and nitrogen stable isotopic values of different species of grasses from a range of open to closed habitat settings within Wytham Wood, Oxfordshire, UK. We find a strong relationship between carbon isotopic depletion of plant tissue and lowered light intensity with an up to 5‰ shift between grass grown in open and closed locations. In order to follow this up the food chain, we also report data on wool from sheep grazing in open pastures near the Wood, and on fallow deer living within the woodland, but which turn out not to show a strong canopy effect, probably related to their feeding strategies. We conclude that there is indeed a strong ‘canopy effect’ in temperate woodland, probably related to differential light levels, but that not all apparently woodland-dwelling mammals show such an effect. We also show considerable isotopic variation at the base of the food chain, which should counsel caution when attempting to interpret dietary isotopes using mixing models.     

Economic geography and the evolution of networks

An evolutionary perspective on economic geography requires adynamic understanding of change in networks. This article explorestheories of network evolution for their use in geography anddevelops the conceptual framework of geographical network trajectories.It specifically assesses how tie selection constitutes the evolutionaryprocess of retention and variation in network structure andhow geography affects these mechanisms. Finally, a typologyof regional network formations is used to discuss opportunitiesfor innovation in and across regions.     

‘Taken captive by the mystery of the Great River’: towards an historical geography of British geography and Atlantic slavery

By examining the case of James MacQueen (1778–1870), this paper initiates a research agenda that contributes to what David N. Livingstone has argued remains the most pressing task for historians of geography: to write ‘the historical geography of geography’. Born in Scotland in 1778, MacQueen was one of the many ‘arm-chair’ geographers whose efforts at synthesising contemporary and historical sources were a significant feature of the encounter between Europe and the rest of the world. Indeed, although he never visited Africa, his speculations about the course and termination of the River Niger turned out to be broadly correct. What makes MacQueen a particularly significant figure was the original source of his theory: enslaved Africans in a Caribbean plantation-colony. In this light, a remark that MacQueen's imagination was ‘taken captive by the mystery of the Great River’ carries a dark double-meaning, because ‘captive’ knowledge was the very source of MacQueen's interest in African geography. Beginning with MacQueen's time in Grenada, the paper explores a series of personal relations, textual traces and West African ethno-histories to reveal how his geographical knowledge and expertise were bound up with Atlantic slavery. This shows not only how the colonial economy, centred on the Caribbean, underwrote the production of geographical knowledge about Africa, but also how British geographical discourse and practice might be probed for traces of Atlantic slavery and enslaved African lives. More generally, the case of James MacQueen illuminates a broader field of relationships between Atlantic slavery, West African exploration, and the development of modern British geography in the late eighteenth and first half of the nineteenth centuries. Examining these relationships is key to writing a ‘historical geography of British geography and Atlantic slavery’ and contributes to postcolonial histories of the discipline by revealing the tangled relationships that bound geography and slavery, knowledge and subjugation, that which ‘captivates’ and those held ‘captive’.     

‘A strong and prosperous condition’ — the geography of state building and social reform in Peter the Great's Russia

The point is often made that the rise of the modern state in Europe provided models which have been influential, if not actually copied, across much of the rest of the world. In Russia during the reign of Peter the Great (1682–1725), not only was the tsar aware of the European experience of state building, but consciously strove to base many of his political and social reforms on European models. Peter aimed at sweeping reform of the Russian state and society in the attempt to bring them into the modern world. The paper argues that the reforms were necessarily geographical, involving an attempt radically to reconstruct the country's economic and social geography. The focus is upon the spatial implications of reform, including the founding and development of the city of St. Petersburg as an experiment in social reconstruction. In the event, Peter's success was only partial, and the end product quite different from the models which had influenced his reforms. It is argued that this relative failure derived not only from the widespread resistance to reform but also from geographical, social and cultural circumstances peculiar to Russia. Greater scholarly sensitivity to the social and cultural contexts in which state building occurs might stimulate more cross-cultural and comparative perspectives and enrich this important area of social theory.     

Positional issues, valence issues and the economic geography of voting in British elections

A body of research has built up in recent years linking thechanging geography of party support in British elections tovariations in the country's economic geography. Consistent withthe economic vote model, government support has been shown tobe higher than average in affluent areas and lower than averagein poorer areas. However, the great majority of such studieshave concentrated on elections between 1979 and 1997, a prolongedperiod of one-party rule. This article argues that this meansexisting research cannot differentiate between the very differentpredictions of positional and valence approaches to economicvoting since both suggest identical outcomes during Conservativeadministrations. By contrasting a period of Conservative rulewith a period of Labour rule, however, the article providesa test of the competing claims of the positional and valencearguments for an understanding of Britain's electoral geography.     

Re-engaging with rationality in economic geography: behavioural approaches and the importance of context in decision-making

Behavioural approaches have become mainstream in economics,supported by the research of cognitive scientists and psychologists,yet their findings have attracted little attention from geographers.This article argues for a renewed behavioural economic geographythat builds on research in behavioural economics but also addressesone of its main shortcomings: a lack of engagement with thesocial context of decision-making. I outline a research agendathat bridges the gap between the disciplines in the area ofpension decision-making, using the example of choice in UK occupationalplans to argue for a mixed methodological approach to meet thechallenge of taking context seriously.     

When things were ‘closing-in’ and ‘rolling up’: the imaginative geography of Elizabeth Bowen’s Anglo-Irish war novel The Last September

This paper examines the imaginative geography of Elizabeth Bowen’s 1929 novel The Last September. Drawing on Said’s analysis of imaginative geographies as registers of territorial identity, I consider the ways in which Bowen’s text maps Anglo-Irish territorial identity in early twentieth-century Ireland. Reading the text as an authoritative, albeit subjective, record of Anglo-Irish experience in Ireland, I identify four interconnected spaces which constitute the imaginative geography of the novel: the open, empty and isolated country; a wider landscape of resistance and control; a distant but necessary England; and an historical landscape of colonial decline. In conclusion, I outline how the concept of imaginative geographies provides a useful lens through which the often fragmented and conflicted nature of territorial identities, both during and after the colonial period, can be explored.     

‘Everything is made of atoms’: the reprogramming of space and time in post-war London

From the middle of the Second World War until the early 1950s, architects, planners and designers in Britain made an unprecedented investment in reforming the built environment as a means to ensure a stable and secure post-war society. This essay considers the importance of movement, trajectory and repetition within this reconstruction vision and how the organisation of these things provided a basis for imagining a new form of consensual urban community. The essay begins by exploring how the County of London Plan (Abercrombie and Forshaw, 1943) and the Greater London Plan (Abercrombie, 1945) articulated a set of spatio-temporal logics, based on the prescribed trajectory of the individual embedded within a programme of quotidian repetitions. These logics suggested that urban space could be built to foreclose the possibility of historical conflict. The essay then explores the material design of two post-war exhibitions, Britain Can Make It (1946) and the Festival of Britain's South Bank Exhibition (1951), which offered visitors an experiential taster of what these new urban choreographies would feel like. To end, the essay explores the recurrent figure of the atom within post-war public pedagogy. Within this briefly ubiquitous mechanistic image lay an unacknowledged assurance about how hierarchical structures of movement and repetition sustained the material world, just as these things were being invoked to secure London's position across a range of scales from the local urban neighbourhood to the post-war Commonwealth.     

Deducing rationales and political tactics in the partitioning of Ireland, 1912–1925

Partition is an intrinsically abstract and simplistic blunt instrument applied on a complex mosaic of peculiarities that constitute reality. There are very few modern states that are ethnically or culturally homogenous. In this context, partition is a subjective territorial tactic that can treat or exacerbate symptoms of historical, political, and geographical difficulties. While exhibiting comparative scope, especially to the role of the British State and the dynamics of national majorities and minorities, the circumstances concerning the partitioning of Ireland deviate from patterns gleaned from other examples as the evolving bases of its partition between 1912 and 1925 mutated at various stages with regard to geography, political status, and function. However, Ireland served as an important historical precedent in illustrating the disparity between the original intent and eventual result of its partition. Indeed, one can extrapolate from the Irish example that partition is better understood as a catalytic tactical process that radically reconfigures the political and geographical dimensions of conflict rather than as a decisive political instrument solving it.     

Wotan and the ‘archetypal Ergriffenheit’: Mystical union, national spiritual rebirth and culture-creating capacity in C. G. Jung's ‘Wotan’ essay

This article analyses the 1936 “Wotan” essay by Swiss psychologist Carl Gustav Jung in light of one of its reigning motifs, Ergriffenheit. First, this term is examined within the works of Protestant theologian Rudolf Otto and Indologist Jakob Wilhelm Hauer, who used it to describe what they claimed to be the original religious experience, a state of being deeply stirred or even seized by the “the holy” or by “the ultimate reality.” The article then examines antecedents in Jung's theory of states of psychic seizure, in which two halves of the psyche come into conflict, the resolution of which leads to an increased capacity to create the arts of culture. The analysis then moves to the “Wotan” essay itself, where Jung brings together his own theory of psychic seizure with the theory of the original religious experience as proposed by the above-named scholars of religion in order to suggest that, under National Socialism, the Germans were in the midst of a collective confrontation with their own inner divinity, which should lead to a national spiritual rebirth. The article then investigates the works of several of the men Jung mentions in the essay, as well as his use of ancient Germanic mythology, to support his claim. Through his portrait of the Germanic archetype Wotan, Jung psychologizes and thereby essentializes the Romantic image of the Germans as “a people of poets and philosophers” as well as that of a Nietzschean “master-race.” In conclusion, the article argues that, at least in 1936, Jung's attitude towards Hitler and National Socialism was much more favorable than has previously been recognized.     

The ‘walking’ megalithic statues (moai) of Easter Island

Explaining how the monumental statues (moai) of Easter Island were transported has remained open to debate and speculation, including their resource expenditures and role in deforestation. Archaeological evidence including analysis of moai variability, particularly those abandoned along ancient roads, indicates transport was achieved in a vertical position. To test this proposition we constructed a precise three-dimensional 4.35 metric ton replica of an actual statue and demonstrate how positioning the center of mass allowed it to fall forward and rock from side to side causing it to ‘walk.’ Our experiments reveal how the statue form was engineered for efficient transport by a small number of individuals.     

Reappraisal of ‘chronospecies’ and the use of Arvicola (Rodentia,Mammalia) for biochronology

The water vole, genus Arvicola, is characterised by a broad geographic distribution throughout Europe and is widespread during the late Middle and Upper Pleistocene. This genus is used as a major biostratigraphic tool within the Quaternary. Specific determinations using the Schmelzband-Differenzierung-Quotient or SDQ have identified many chronospecies within the fossil species Arvicola cantiana (Hinton, 1910). As SDQ calculation remains limited, this study reappraises the Arvicola genus in terms of morphodiversity and morphospace using outline analysis which takes into account the tooth as a whole. Outline analysis suggests that one single species of Arvicola, A. cantiana, was present during the Pleistocene. This species shows great variability with no trends or patterns in morphospace. Thus, these results call into question the reliability of SDQ for specific determinations and throw doubt on the biochronological framework based on Arvicola.     

The correspondence between Élisée Reclus and Pëtr Kropotkin as a source for the history of geography

The State Archive of the Russian Federation (GARF) contains a corpus of around one hundred letters sent by Élisée Reclus to Pëtr Kropotkin between 1882 and 1905. The correspondence is mainly concerned with their geographical works, notably the collaboration of Kropotkin with the Nouvelle Géographie Universelle (1876-1894) and the Brussels edition of Kropotkin’s Orographie de la Sibérie (1904), edited by Reclus. In this paper, we deal first with the importance of this source: it is an example of the material work of a network of geographers who were at the same time the founders of the international anarchist movement. We suggest the correspondence falls into two parts: the first period (1882-1886) when Reclus was in exile in Switzerland after the Paris Commune of 1871, and Kropotkin was in prison in France; and the second period (1888-1905) when the two anarchist geographers discuss the role of geographical education, historical geography in Europe and its part in the globalisation of their era. The archive also contains significant evidence of their relationships with British geography: Kropotkin lived in London and joined the Royal Geographical Society and was on familiar terms with leading Fellows, such as John Scott Keltie and Halford Mackinder. The paper addresses the significance of the correspondence for understanding the relationships between geography, politics and public education, and the role of these heterodox geographers in the construction of geographical knowledge. The paper is accompanied by the publication, for the first time, of an edited selection of the letters.     

Latitudinal variation in a photoperiod response gene in European barley: insight into the dynamics of agricultural spread from ‘historic’ specimens

Between ca. 6000 BC and ca. 500 BC, barley cultivation spread across the continent of Europe from the extreme south to the extreme north. Carbon-dating would suggest that this spread, and indeed the spread of crop cultivation generally, varied in its pace, with ‘delays’ at certain points along its route. Such delays in the spread of agriculture have been explained as resulting from the slow assimilation of agricultural practices by existing indigenous human populations or as the time taken for the crops to adapt to novel climatic conditions, such as altered temperature regimes and day-lengths. A mutant form of the photoperiod response gene, Ppd-H1, causes barley to be non-responsive to long days, while the wild-type responsive form allows plants to flower in response to long days. We sequenced this gene in 65 ‘historic’ barley accessions, from the late 19th and early 20th centuries, in order to explore the potential role of environmental adaptation in the spread of agriculture. We chose to use ‘historic’ material, to complement the richer patterns in extant genetic lines, by spreading the data range in both time and space. Our ‘historic’ barley data shows a latitudinal divide in the Ppd-H1 gene similar to that found in extant lines, but with clearer geographical resolution, and extending northwards into the Arctic Circle. We discuss the implications of our results in relation to the dynamics of agricultural spread across Europe.     

吉林德惠市城岗子金代古城发掘简报

Many ash- pits and house- foundations of Kin Dynasty had been found in Cheng-gang-zi Ancient city. Pottery jar、pot、basin、coins、iron hairpin and some ornaments were found in some ash-pits. Bricks、tile pieces、building ornaments and household utensils were found abundant in house - foundations. A set of complete utensils were unearthed in one house-foundation which floor was paved with slabstone.     

Early pan‐Arabism in Egypt's July revolution: the Free Officers' political formation and policy‐making, 1946–54

Between 1952 and 1970, Gamal Abdel Nasser and Egypt's Free Officers Movement established the paradigmatic pan‐Arabist revolution from above. Yet it has become something of a cliché to maintain that the Free Officers had no blueprint of action before seizing power and that they later instrumentalised pan‐Arabism in their foreign policy, thinly veiling their actual commitments to Egyptian nationalism and imperialism. By contrast, this contribution underlines the impact of the British colonial context on the Free Officers' political formation and their early identification with pan‐Arabism in turn. Drawing on pamphlets, speeches, media output and memoirs, it shows that the Free Officers developed a distinctive form of anticolonial nationalism that emphasised social justice and invoked overlapping Egyptian and Arab identities. Their aspirations for liberation thus entailed a connected foreign policy and nation building programme in which pan‐Arabism was a prime – and early – component.     

The role of the Irish boundary commission in the entrenchment of the Irish border: from tactical panacea to political liability

The abortive saga of the Irish Boundary Commission has largely been dismissed as a minor footnote that warrants little elaboration in the discussion of Ireland's partition. This is unsurprising considering that its final report was hastily suppressed so as to prevent the destabilisation of the nascent regimes in Northern Ireland and the then Irish Free State. However, the concept of the Commission derives from the intensifying controversies of Irish Home Rule and partition, and the consequent difficulties in establishing how and where a boundary was eventually drawn as well as to the status of the entities it would be dividing. The Commission was legally conceived in Article 12 of the 1921 Anglo-Irish Treaty but confusion over its wording protracted a sequence of events that ensured that it was almost three years before it actually met. Article 12 was eventually interpreted in a restrictive manner, which exposed inherent flaws that were either ignored or naively underestimated when it was originally adapted from part of the post-World War I Treaty of Versailles. Furthermore, the complexities of evidence were inadequately scrutinised by a small and under-resourced panel that operated under considerable political pressure to delimit a precise line that satisfied subjective terms of reference. Nevertheless, the revoked Commission served as a crucial catalyst in defining the Irish Free State's relationship with the British State and in entrenching the territorial framework of Northern Ireland's six counties that exists to this day.     

The development of the longbow in late medieval England and ‘technological determinism’

Traditional understandings of the development of the medieval English longbow and its role in the fourteenth-century ‘infantry revolution’ have recently been challenged by historians. This article responds to the revisionists, arguing based on archaeological, iconographic and textual evidence that the proper longbow was a weapon of extraordinary power, and was qualitatively different from – and more effective than – the shorter self-bows that were the norm in England (and western Europe generally) before the fourteenth century. It is further argued that acknowledging the importance of the weapon as a necessary element of any credible explanation of English military successes in the era of the Hundred Years War does not constitute ‘technological determinism’.     

The political significance of Christine de Pizan's third estate in the Livre du corps de policie

Although the general historical context of Christine de Pizan's Livre du corps de policie (LCP), the Orleanist-Burgundian feud occasioned by the periodic insanity of King Charles VI, has long been recognised, the precise argument that the author wages through her unique configuration of the third part of the body politic has not been explored. This essay reads the LCP as an intervention into the escalating struggle for power between Charles VI's brother, the duke of Orleans, and his cousin, the duke of Burgundy. Christine's purpose emerges most clearly in her peculiar arrangement of the third part of her body politic, le peuple, where two points bear particular consideration: her inclusion of the University and her division of the ‘merchants’ across two separate categories, a repartition which seems to refer to the contemporary distinction between the highly-placed merchants of Paris and the butchers. Christine seems to be arguing that if the University were to make common cause with the ruling burghers and well-placed merchants, they could force into submission their more restless brothers and sisters, the butchers and their thuggish followers, whom the duke of Burgundy would finally convince to rise up in 1413 in what has become known as the Cabochian Revolt.     

‘The car indispensable’: the hidden influence of the car in inter-war suburban London

Histories of suburban London underplay the importance of the car to inter-war mobilities; an emphasis on public transport has occluded our understanding of the role of motoring in the transformation of suburban life. This is in marked contrast to work on American suburbia that affords the car a prime role in suburban formation. This article uses information from dealer's sales records, motoring magazines and commentary on suburbia to examine the extent to which motoring was adopted by London's wider suburban middle classes in the inter-war years. It concludes that by the end of the 1930s, suburban motoring had highly heterogeneous levels of adoption, but, where it was popular, it changed mobility in a dramatic manner that prefigured wider developments of the late 1950s.