Phenotypic signatures of urbanization are scale-dependent : a multi-trait study on a classic urban exploiter

Understanding at which spatial scales anthropogenic selection pressures operate most strongly is a prerequisite for efficient conservation and management of urban biodiversity. Heterogeneity in findings on the strength and direction of urbanization effects may result from a lack of consensus on which spatial scales are most adequate when studying biotic effects of urbanization. Therefore, here, using the house sparrow (Passer domesticus) as model, we test the hypothesis that more than one spatial scale will explain variation among phenotypic stress markers. By applying a unique hierarchical sampling design enabling us to differentiate between local and regional effects of urbanization, we here show that the strength and direction of relationships with the percentage of built-up area - a simple structural measure of urbanization - vary among phenotypic stress markers and across the spatial range over which urbanization is measured. While inverse relationships with scaled body mass and bill height of adult house sparrows (Passer domesticus) were strongest when the degree of urbanization was quantified at city-level, similar relationships with corticosterone concentrations in feathers were only detected at the scale of individual home ranges. In contrast, tarsus length, wing length, and two measures of feather development were not significantly related to urbanization at any spatial scale. As the suite of phenotypic stress markers applied in this study revealed signatures of urbanization over a broad spatial range, we conclude that measures aimed at mitigating impacts of urbanization on free-ranging populations should best be implemented at multiple spatial scales too

THE SPATIAL PATTERN OF URBANIZATION AND SMALL CITIES DEVELOPMENT IN CENTRAL JAVA: A CASE STUDY OF SEMARANG-YOGYAKARTA-SURAKARTA REGION

The special form of urbanization in Indonesia has led to a variety of themes on the urban development studies in Indonesia. Since 1990s, there has been an emphasis on the development of mega-urban regions, particularly those surrounding Jakarta as the biggest and the prime city in Indonesia. This research is aimed at elaborating the previous knowledge on the urbanization pattern in Indonesia, and Java in particular. More specifically, this study examines urban development trend in Central Java. The analysis of urbanization in this study can be classified into two categories, i.e. analysis of the urbanization level and analysis of the urbanization growth. These two analyses are combined by applying some GIS methods in order to understand the pattern of urbanization in the region. It is found that the urbanization process in Central Java has transformed the predominantly rural regions in the 1980s into the urban ones. The rapid growth of urban population forms some observable pattern that may be different to the national pattern. There are common spatial patterns, such as the importance of the coastal region and the essential role of the larger urban centers in the urbanization. In this regards, the emergence of the smaller centers has also contributed to the process, especially in bridging a more balanced development between major urban centers and their respective rural hinterland

The Weight of Economic Growth and Urbanization on Electricity Demand in UAE

This study aims to explore the relationship between economic growth, urbanization, financial development and electricity consumption in case of United Arab Emirates. The study covers the time period of 1975-2011. We have applied the ARDL bounds testing to examine long run relationship between the variables in the presence of structural breaks. The VECM Granger causality is applied to investigate the direction of causal relationship between the variables. Our empirical exercise found cointegration between the series in case of United Arab Emirates. Further, results reveal that inverted U-shaped relationship is found between economic growth and electricity consumption i.e. economic growth raises electricity consumption initially and declines it after a threshold level of income per capita. Financial development adds in electricity consumption. The relationship between urbanization and electricity consumption is also inverted U-shaped. This implies that urbanization increases electricity consumption initially and after a threshold level of urbanization, electricity demand falls. The causality analysis finds feedback hypothesis between economic growth and electricity consumption i.e. economic growth and electricity consumption are interdependent. The bidirectional causality is found between financial development and electricity consumption. Economic growth and urbanization Granger cause each other. The feedback hypothesis is also found between urbanization and financial development, financial development and economic growth and same is true for electricity consumption and urbanization.

Urban Settlement: Data, Measures, and Trends

This paper examines data on urbanization. We review the most commonly used data sources and highlight the difficulties inherent in defining and measuring the size of urban versus rural populations. We show that differences in the measurement of urban populations across countries and over time are significant and discuss the methods used for these measurements, as well as for projecting urbanization. We also analyze recent trends and patterns in urbanization. Finally, we describe the principal channels of urbanization and examine their relative contributions to the global urbanization process.urbanization, urbanization data

Effects of urbanization on host-pathogen interactions, using Yersinia in house sparrows as a model

Urbanization strongly affects biodiversity, altering natural communities and often leading to a reduced species richness. Yet, despite its increasingly recognized importance, how urbanization impacts on the health of individual animals, wildlife populations and on disease ecology remains poorly understood. To test whether, and how, urbanization-driven ecosystem alterations influence pathogen dynamics and avian health, we use house sparrows (Passer domesticus) and Yersinia spp. (pathogenic for passerines) as a case study. Sparrows are granivorous urban exploiters, whose western European populations have declined over the past decades, especially in highly urbanized areas. We sampled 329 house sparrows originating from 36 populations along an urbanization gradient across Flanders (Belgium), and used isolation combined with 'matrix-assisted laser desorption ionization-time of flight mass spectrometry' (MALDI-TOF MS) and PCR methods for detecting the presence of different Yersinia species. Yersinia spp. were recovered from 57.43% of the sampled house sparrows, of which 4.06%, 53.30% and 69.54% were identified as Y. pseudotuberculosis, Y. enterocolitica and other Yersinia species, respectively. Presence of Yersinia was related to the degree of urbanization, average daily temperatures and the community of granivorous birds present at sparrow capture locations. Body condition of suburban house sparrows was found to be higher compared to urban and rural house sparrows, but no relationships between sparrows' body condition and presence of Yersinia spp. were found. We conclude that two determinants of pathogen infection dynamics, body condition and pathogen occurrence, vary along an urbanization gradient, potentially mediating the impact of urbanization on avian health

Urbanization without growth : a not-so-uncommon phenomenon

To find out why African countries'experience with urbanization and sustained growth appeared to differ from that of other countries, the authors investigated the determinants of urbanization across countries over 40 years. Rather than studying individuals'decisions to migrate, they relied on macroeconomic data and cross-country comparisons. A central hypothesis of their study: that individuals move (with varying degrees of ease) in response to economic incentives and opportunities. If location incentives are distorted, so is growth. The authors find that urbanization levels are closely correlated with levels of income. But urbanization continues even during periods of negative growth, carried by its own momentum, largely a function of the level of urbanization. From that viewpoint, Africa's urbanization without growth is not a puzzle. Factors other than income that help predict differences in levels of urbanization across countries include: a) income structure; b) education; c) rural-urban wage differentials; d) ethnic tensions; and e) civil disturbances. In addition, the relationship between economic incentives and urbanization is weaker in countries with fewer civil or political liberties. Factors other than initial urbanization level that help explain the speed of urbanization include: 1) The sector from which income growth is derived; 2) ethnic tensions; 3) civil disturbances and democracy (these two slow the pace of urbanization if all else is constant); 4) rural-urban wage differentials, whether they represent an urban bias or simply lower productivity in agriculture relative to other sectors. The weak relationship that this study shows between urbanization and traditionally accepted migration factors suggests that in Africa economists are overlooking part of the urbanization story. The fact that the informal sector appears to provide a significant source of income for urban migrants, coupled with the overlap between rural and urban activities, may shed light on the nature of urbanization in Africa.Banks&Banking Reform,National Urban Development Policies&Strategies,Urban Housing and Land Settlements,Public Health Promotion,Urban Services to the Poor,Urban Housing and Land Settlements,National Urban Development Policies&Strategies,Governance Indicators,Banks&Banking Reform,Urban Services to the Poor

Urban Settlement: Data, Measures, and Trends

This paper examines data on urbanization. We review the most commonly used data sources, and highlight the difficulties inherent in defining and measuring the size of urban versus rural populations. We show that differences in the measurement of urban populations across countries and over time are significant, and discuss the methods used to obtain these measurements, as well as those for projecting urbanization. We also analyze recent trends and patterns in urbanization. Finally, we describe the principal channels of urbanization and examine their relative contributions to the global urbanization process.Urbanization, measurement, urban population

Unbounded urbanization and the Horizontal Metropolis : the pragmatic program of August Mennes in the Antwerp agglomeration

Parallel to many discussions in other European cities, the debate on a metropolitan Antwerp emerged at the turn of the 20th century, following the decision to tear down the old ramparts around the city in 1904. Once boundless, the old core became for the first time the subject of a contiguous urban expansion at its very fringes. Soon, however, far more loose urbanization processes would wash over the land as the urban territories rapidly expanded beyond what was at first imagined. By consequence, the face of the future Antwerp metropolis would be shaped by a series of interlocking and unbounded urbanization processes. Tracing the interrelated endeavors of the key parties that helped shaping these urbanization processes, ranging from property tycoons, technocrats and architects to key figures in the political world, my PhD research aims at rendering the contours of a long history of the construction of Antwerp’s twentieth century belt within which the notions of urbanism and urbanization are blurred. Through an eclectic catalogue of five ‘urban questions’, this paper investigates the various ways in which the process of territorial rescaling set in motion in 1904 coproduced the features of today’s horizontal metropolis. Based on the activities of engineer August Mennes, the paper will try to conclude that the Antwerp Horizontal Metropolis surfaced as the result of a juxtaposition of urbanization techniques that question and transcend the interpretation of ‘urbanization’ as a process of random and speculative accumulation

Urbanization Sans Development?

From a theoretical standpoint, the question has to be asked whether or not the census should retain its present definition of urban areas. There is a need for a more meaningful integration of the structural, institutional and demographic criteria, if the term is to hold substantive meaning. In this light, this paper proposes that a two-tier urban definition be employed. The old definition should be retained for trend analysis purposes while a new definition that incorporates socioeconomic purposes should be instituted.urban management, population and family relation, urbanization, data and statistics

Urbanization Sans Development?

From a theoretical standpoint, the question has to be asked whether or not the census should retain its present definition of urban areas. There is a need for a more meaningful integration of the structural, institutional and demographic criteria, if the term is to hold substantive meaning. In this light, this paper proposes that a two-tier urban definition be employed. The old definition should be retained for trend analysis purposes while a new definition that incorporates socioeconomic purposes should be instituted.urban management, population and family relation, urbanization, data and statistics