Geographie
Refine
Year of publication
Document Type
- Article (103) (remove)
Has Fulltext
- yes (103)
Is part of the Bibliography
- no (103)
Keywords
- Transport affordability (3)
- Transport-related social exclusion (3)
- Biodiversity (2)
- Car-reduced neighborhood (2)
- Frankfurt am Main (2)
- Globalisierung (2)
- Mobility (2)
- Practice theory (2)
- Social practice theory (2)
- Transport poverty (2)
Institute
- Geographie (103)
- Biodiversität und Klima Forschungszentrum (BiK-F) (9)
- Präsidium (7)
- Cornelia Goethe Centrum für Frauenstudien und die Erforschung der Geschlechterverhältnisse (CGC) (4)
- Senckenbergische Naturforschende Gesellschaft (4)
- Gesellschaftswissenschaften (2)
- Institut für Ökologie, Evolution und Diversität (2)
- Zentrum für Interdisziplinäre Afrikaforschung (ZIAF) (2)
- Centre for Drug Research (1)
- Erziehungswissenschaften (1)
Im Interview mit Dr. Anne Hardy wagt RMV-Stiftungsprofessor Martin Lanzendorf einen Blick in die Zukunft: Die flexible, zweckangepasste Wahl von Verkehrsmitteln ist die Regel und wird durch die Vernetzung mit Smartphones erleichtert, Radfahrer und Fußgänger erobern die Straße zurück – und die Goethe-Universität entwickelt neue Initiativen im Mobilitäts- und Energiemanagement.
Drawing on the example of a research project on the extension of the margins of the global agricultural market through the workings of agribusiness in Ghana, this paper explores what contribution ethnographic approaches can make to the study of quotidian market constructions in organizational settings. It demonstrates how ethnographies of marketization can be grasped conceptually, epistemologically and methodologically, as well as what practical and methodological challenges such a practice-oriented approach towards the everyday organization of markets might encounter. By doing so, the paper offers a methodological contribution to the interdisciplinary field of marketization studies. Moreover, this paper urges economic geographers to further harness the epistemological potential of ethnographic approaches.
Lebensmittelkrisen wie BSE, Schweinepest, Vogelgrippe und der »Gammelfleischskandal« haben das Vertrauen der Verbraucher in den Agrarmarkt erschüttert. Deshalb verwenden Produzenten und Einzelhändler heute mehr Anstrengungen als jemals zuvor darauf, der verunsichernden Anonymität der global organisierten Produktion durch die Herstellung sozialer Nähe entgegenzuwirken. So suggerieren Herkunftszertifi kate für Regionalprodukte sowie eine schnell steigende Zahl von Hygiene-, Sozial- und Umweltstandards Verlässlichkeit aufgrund von geringen räumlichen Distanzen und unabhängiger Kontrolle, während Initiativen wie »Caretrace: Meet the Farmer« dadurch Vertrauen schaffen sollen, dass sich der Konsument im Internet über den individuellen Produzenten informieren kann. Doch die Folgen dieser Umbrüche für Produktionsweisen und Anbauregionen sind bislang nur wenig bekannt.
Refugee reception in Germany is a primarily municipal task that relies heavily on neighborhood-based volunteering. This paper asserts that there are fundamental spatial mismatches between municipal policies and neighborhood-based approaches that place additional burden on all of the stakeholders involved. Drawing from the case of Frankfurt-Rödelheim, which is a socially and ethnically mixed neighborhood in Frankfurt am Main, I show how the way the municipality accommodates refugees disregards the politically embraced work of neighborhood-based volunteers and how the ideal of neighborhood-based inclusion creates a spatial fetish that fails the living reality of the refugees. The findings are based on my ethnographic fieldwork as volunteer in a neighborhood-based welcome initiative.
Die Schlagzeilen verdeutlichen: Wölfe lösen beim Menschen gleichermaßen Angst und Faszination aus. Das Raubtier wird bei Nutztierhaltern, Jägern, Naturschützern und Politikern kontrovers diskutiert. Die Wolfspopulation wächst in Deutschland zurzeit um etwa 30 Prozent pro Jahr und die Anzahl der vom Wolf gerissenen Tiere nimmt zu. Das »Rotkäppchen-Syndrom« ist tief in unseren Wertevorstellungen verankert. Doch was ist dran am Mythos "böser Wolf"?
The calcareous substrate of spring-fed fens makes them unique islands of biodiversity, hosting endangered, vulnerable, and protected vascular plants. Hence, spring-fed fens ecosystems require special conservation attention because many of them are destroyed (e.g. drained, forested) and it is extremely difficult or even impossible to restore the unique hydrogeological and geochemical conditions enabling their function. The long-term perspective of paleoecological studies allows indication of former wetland ecosystem states and provides understanding of their development over millennia. To examine the late Holocene dynamics of a calcareous spring-fed fen (Raganu Mire) ecosystem on the Baltic Sea coast (Latvia) in relation to environmental changes, substrate and human activity, we have undertaken high-resolution analyses of plant macrofossils, pollen, mollusc, stable carbon (δ13C) and oxygen (δ18O) isotopes combined with radiocarbon dating (AMS) in three coring locations. Our study revealed that peat deposits began accumulating ca. 7000 cal. yr BP and calcareous deposits (tufa) from 1450 cal. yr BP, coinciding with regional hydrological changes. Several fire events occurred between 4000 and 1600 cal. yr BP, which appeared to have had a limited effect on local vegetation. The most significant changes in the forest and peatland ecosystems were at 3200 cal. yr BP associated with a dry climate stage and high fire activity, and then between 1400 and 500 cal. yr BP potentially associated with temperature changes during the Medieval Climate Anomaly (MCA) and Little Ice Age. Hydrological disturbances in the peatland catchment from 1400 cal. yr BP were most likely strengthened by human activity (deforestation) in this region. The relationship between the development of this peatland and changes in its catchment area, such as land cover changes or fluctuations in groundwater levels, suggest that protection and restoration of spring-fed fen ecosystems should also include the surrounding catchment. The presence of calcareous sediments, as well as appropriate temperature and local hydrological conditions appear to be the most crucial factors controlling Cladium marisus populations in our site - currently at the eastern limit of its distribution in Europe.
Climatic seasonality drives ecosystem processes (e.g. productivity) and influences plant species distribution. However, it is poorly understood how different aspects of seasonality (especially regarding temperature and precipitation) affect growth continuity of trees in climates with low seasonality because seasonality is often only crudely measured. On islands, exceptionally wide elevational species distribution ranges allow the use of tree rings to identify how growth continuity and climate–growth relationships change with elevation. Here, we present a novel dendroecological method to measure stem growth continuity based on annual density fluctuations (ADFs) in tree rings of Pinus canariensis to indicate low climatic seasonality. The species ranges from 300 to >2000 m a.s.l. on the trade wind-influenced island of La Palma (Canary Islands), where we measured three decades of tree-ring data of 100 individuals distributed over 10 sites along the entire elevational range. The successfully implemented ADF approach revealed a major shift of stem growth continuity across the elevational gradient. In a remarkably clear pattern, stem growth continuity (percentage of ADFs) showed a hump-shaped relationship with elevation reaching a maximum at around 1000 m a.s.l. Low- to mid-elevation tree growth was positively correlated with the Palmer Drought Severity Index (PDSI; indicating aridity) and sea surface temperature (indicating trade wind-influenced moderation of water supply), while high-elevation tree growth was positively correlated with winter temperature (indicating a cold-induced dormancy period). We conclude that ADFs are a useful method to measure stem growth continuity in low-seasonality climates. Growth of P. canariensis on the Canary Islands is more frequently interrupted by winter cold at high elevations and by summer drought at low elevations than in the trade wind-influenced mid elevations, where growth sometimes continues throughout the year. Climate change-associated alterations in trade wind cloud formation might cause non-analogue growth limitations for many unique island species.
Background: The European beech is arguably the most important climax broad-leaved tree species in Central Europe, widely planted for its valuable wood. Here, we report the 542 Mb draft genome sequence of an up to 300-year-old individual (Bhaga) from an undisturbed stand in the Kellerwald-Edersee National Park in central Germany.
Findings: Using a hybrid assembly approach, Illumina reads with short- and long-insert libraries, coupled with long Pacific Biosciences reads, we obtained an assembled genome size of 542 Mb, in line with flow cytometric genome size estimation. The largest scaffold was of 1.15 Mb, the N50 length was 145 kb, and the L50 count was 983. The assembly contained 0.12% of Ns. A Benchmarking with Universal Single-Copy Orthologs (BUSCO) analysis retrieved 94% complete BUSCO genes, well in the range of other high-quality draft genomes of trees. A total of 62,012 protein-coding genes were predicted, assisted by transcriptome sequencing. In addition, we are reporting an efficient method for extracting high-molecular-weight DNA from dormant buds, by which contamination by environmental bacteria and fungi was kept at a minimum.
Conclusions: The assembled genome will be a valuable resource and reference for future population genomics studies on the evolution and past climate change adaptation of beech and will be helpful for identifying genes, e.g., involved in drought tolerance, in order to select and breed individuals to adapt forestry to climate change in Europe. A continuously updated genome browser and download page can be accessed from beechgenome.net, which will include future genome versions of the reference individual Bhaga, as new sequencing approaches develop.
Urban areas develop on formal and informal levels. Informal development is often highly dynamic, leading to a lag of spatial information about urban structure types. In this work, an object-based remote sensing approach will be presented to map the migrant housing urban structure type in the Pearl River Delta, China. SPOT5 data were utilized for the classification (auxiliary data, particularly up-to-date cadastral data, were not available). A hierarchically structured classification process was used to create (spectral) independence from single satellite scenes and to arrive at a transferrable classification process. Using the presented classification approach, an overall classification accuracy of migrant housing of 68.0% is attained.
Amidst the growing interest in enhancing the academic understanding of the relationships between e-shopping and transport, a key element remains underexplored – the impact of e-shopping on spatial accessibility to in-store retail. The paper studies variations in multimodal accessibility to in-store retail between e-shopper groups and the associated spatial effects. The research is based on a face-to-face questionnaire, administered in the city of Alcalá de Henares (Madrid Metropolitan Area, Spain), which provides data on socio-economic characteristics, e-shopping habits, and travel time preferences to reach in-store retail. Clustering techniques serve to identify three e-shopper groups: occasional e-shoppers with a car, infrequent e-shoppers with a car, and frequent e-shoppers without a car. A comparison of e-shopper distance-decay functions to reach in-store retail is made, revealing significant differences between the three e-shopper groups for car and public transport for any time interval. However, for walking such differences are limited to time intervals between 10 and 40 minutes. Distance-decay functions are processed through a gravity-based model, identifying three main multimodal accessibility places: highly resistant places to e-shopping, moderately resistant places, and vulnerable places. Places that are highly resistant to e-shopping are mainly located in the city centre, while vulnerable places are mostly found in the city’s periphery. The paper closes with concluding remarks on policymaking and a few pathways for future research.