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Demographic Decline (demographic + decline)
Selected AbstractsGendering the Black Death: Women in Later Medieval EnglandGENDER & HISTORY, Issue 3 2000S. H. Rigby This review article of Mavis Mate's Daughters, Wives and Widows after the Black Death: Women in Sussex, 1350,1535 (1998) locates Mate's work within the broader context of the debate about changes in women's social position caused by the collapse in population following the Black Death. Was demographic decline accompanied by growing social and economic opportunities for women or should historians emphasise the continuity of female work as low-skilled, low-status and low-paid throughout the late medieval and early modern periods? How did women's role in the labour market affect the age of marriage, fertility rates and long-term population change? In general, Mate's conclusions offer support to the ,pessimists': women's work was vital to the household but economic centrality did not bring a commensurate social power or legal rights and the ideology of female subordination remained firmly in place. The main problem with Mate's case is, inevitably, a lack of evidence, for family structure, for the sexual division of labour and, above all, for affective relations. Nevertheless, this detailed, empirically based local study shows how successfully women's history has moved into the historical mainstream. [source] Labor Force Trends and Immigration in Europe,INTERNATIONAL MIGRATION REVIEW, Issue 3 2005Serge Feld Labor force trends up to 2025 for the fifteen countries (before May 1, 2004) of the European Community are examined. Will demographic decline have an early effect on manpower volume? An estimation is made to determine whether present migratory flow levels in these countries will be sufficient to counter labor force stagnation. Manpower trend scenarios are proposed for each country. They show highly contrasting situations. These countries favor different policies for mobilizing and increasing their manpower volume. There is wide divergence between the various EU countries as concerns their demogra hic situation and labor force partici ation rate as well as their social security systems. labor force partici ation rate as well as their social security systems. Considering these highly diverse national characteristics, the difficulty in arrivin at a consensus on EU migratory policy harmonization is stressed [source] Genetic structure of the European polecat (Mustela putorius) and its implication for conservation strategiesJOURNAL OF ZOOLOGY, Issue 1 2006C. Pertoldi Abstract During the last century, the European polecat Mustela putorius populations in most of Europe declined and survived in fragmented patches, because of habitat alterations and direct persecution. To assess the genetic consequences of the demographic decline and to describe the spatial pattern of genetic diversity, 250 polecats sampled at seven localities from five European countries , Poland, Denmark (southern Denmark and northern Denmark), Spain, Belgium (eastern and western) and the Netherlands , were screened by means of nine microsatellite loci. Genetic diversity estimated by mean expected heterozygosity (HE) and allelic richness (AR) were moderately high within populations [range: 0.50 (northern Denmark) ,HE,0.64 (Poland) and 1.33,AR,7.80] as compared with other carnivores and mustelids. Bottleneck tests suggested that polecat populations in southern Denmark and Poland have declined recently and populations from northern Denmark and the Netherlands have expanded recently, whereas the remaining populations did not show any sign of demographic change. Recent demographic changes could suggest that some of the populations are still not in equilibrium, which could partly explain the relatively high genetic variability observed in polecat populations despite the drastic decline in population size observed in several European countries. A significant heterozygote deficiency [FIS=0.19; 0.01,95% confidence interval (CI),0.32] suggests substructuring within the total European sample. Partitioning of the genetic variation among sampling locations (FST=0.14; 0.06,95% CI,0.23) and pairwise FST between localities (range: 0.01,FST,0.37) without any correlation with the geographic distances between localities were found, suggesting a recent divergence and a restriction of gene flow between populations and the action of genetic drift. An assignment test showed that the Polish and the northern Danish populations were the most unique, whereas the other populations were partially admixed. Factorial component analysis tests indicate a subdivision of the total sample into two distinct groups: one including the samples from Poland and the two Danish localities and the second group comprising the remaining localities investigated. The observed pattern of genetic differentiation is suggested to be due to two main routes of recolonization after the last glacial period. To compare the results obtained with microsatellite data, the most variable region of the mitochondrial DNA (d-loop) was sequenced and different phylogenetic reconstructions and genetic diversity analyses based on nucleotide (,) and haplotype diversity (h) measures within populations were performed using a subsample of populations. The lack of well-defined geographical structure, as well as the reduced level of mitochondrial DNA variability (,: 0.00274±0.00038; h: 0.876±0.028) that was found, has been previously reported in several studies on different carnivores and supports the hypothesis of post-glacial recolonization from southern or eastern refugees of Europe as suggested by the microsatellite data. Implications for conservation strategies of the polecat at the European level are discussed. [source] The genetic impact of demographic decline and reintroduction in the wild boar (Sus scrofa): A microsatellite analysisMOLECULAR ECOLOGY, Issue 3 2003C. Vernesi Abstract The reintroduction of wild boar from central Europe after World War II has contributed substantially to the range expansion of this species in Italy, where indiscriminate hunting in earlier times resulted in extreme demographic reduction. However, the genetic impact of such processes is not well-understood. In this study, 105 individuals from Italian and Hungarian wild boar populations were characterized for nine autosomal microsatellite loci. The Hungarian samples, and two central Italian samples from protected areas (parks) where reintroduction is not documented, were assumed to be representative of the genetic composition of the source and the target populations in the reintroduction process, respectively. Animals hunted in the wild in the Florence area of Tuscany (Italy) were then studied to identify the effects of reintroduction. The results we obtained can be summarized as follows: (i) none of the populations analysed shows genetic evidence of demographic decline; (ii) the three parental populations from Italy and Hungary are genetically distinct; however, the low level of divergence appears in conflict with the naming of the Italian and the European subspecies (Sus scrofa majori and Sus scrofa scrofa, respectively); in addition, the Italian groups appear to be as divergent from each other as they are from the Hungarian population; (iii) most of the individuals hunted near Florence are genetically intermediate between the parental groups, suggesting that hybridization has occurred in this area, the average introgression of Hungarian genotypes is 13%, but , 45% of the genetic pool of these individuals can not be directly attributed to any of the parental populations we analysed; (iv) analysis of microsatellite loci, though in a limited number, is an important tool for estimating the genetic effect of reintroduc ion in the wild boar, and therefore for the development of conservation and management strategies for this species. [source] Combining genetic and ecological data to assess the conservation status of the endangered Ethiopian walia ibexANIMAL CONSERVATION, Issue 2 2009B. Gebremedhin Abstract Knowledge about the phylogenetic history, genetic variation and ecological requirements of a species is important for its conservation and management. Unfortunately, for many species this information is lacking. Here we use multiple approaches (phylogenetics, population genetics and ecological modelling) to evaluate the evolutionary history and conservation status of Capra walie, an endangered flagship species of wild goat endemic to Ethiopia. The analysis of mitochondrial cytochrome b and Y-chromosome DNA sequences suggests that C. walie forms a monophyletic clade with Capra nubiana, but potentially has been isolated for up to 0.8 million years from this closely related species. Microsatellite DNA analyses show that C. walie has very low genetic variation (mean heterozygosity=0.35) compared with other endangered mammals. This reduced variation likely derives from a prolonged demographic decline and small effective population size. Ecological niche modelling using the bioclimatic features of habitats occupied by C. walie, suggests ecological differences between C. walie and C. nubiana, and identifies the areas most suitable for future reintroductions of C. walie. The genetic and bioclimatic data suggest that C. walie is distinct and requires immediate conservation actions including genetic monitoring and reintroductions to establish independent populations. This study illustrates how combining noninvasive sampling along with genetic and ecological (bioclimatic) approaches can help assess conservation status of poorly known species. [source] PEOPLING THE VICTORIAN GOLDFIELDS: FROM BOOM TO BUST, 1851,1901AUSTRALIAN ECONOMIC HISTORY REVIEW, Issue 2 2010Charles Fahey demography; migration; mining; Victoria Victoria experienced a surge of migration after the discovery of gold in 1851. I explore the social and geographic background of migrants lured to the colony by opportunities opened up by gold mining. When alluvial gold was exhausted, the skills of migrants enabled them to exploit the more difficult deep lead and quartz reef gold deposits and to establish cities and towns. Urban growth was encouraged by high marriage and birth rates in the 1860s. In the last two decades of the nineteenth century goldfields communities generally suffered economic and demographic declines. [source] | |||||||||||||