Evidence for Migration Influx into the Ancient Greek Colony of Metaponto: A Population Genetics Approach Using Dental Nonmetric Traits

Ancient Greek colonies were founded by Greek seafarers all along the Mediterranean coast as early as the eighth century bc . Despite extensive archaeological and historical research, the population structure of the inhabitants of Greek colonies and their relationship to indigenous populations are still debated. Here, we perform a biodistance analysis to reconstruct migration and gene flow between the ancient Greek colony of Metaponto (southern Italy) and indigenous groups in the surrounding hinterland (900–250 bc ). We collected dental nonmetric trait data of 355 human skeletons from the indigenous Italic sites of Santa Maria d'Anglona, Incoronata and Passo di Giacobbe. This data set is compared with an urban and rural sample of the Greek colony of Metaponto comprising 351 individual dentitions. The R‐matrix approach is used to estimate inter‐population relationships and F _ST. The resulting kinship coefficients indicate that the three indigenous groups exhibit greater similarity to each other and possess lesser similarity to the two Metapontian samples. Interestingly, the two samples of Metaponto are least similar to each other, although they are geographically very close. The F _ST estimates confirm this pattern and reveal greater biological variation between the two nearby Metaponto samples (F _ST = 0.0603) than between the three geographically fairly distant indigenous groups (F _ST = 0.0389). We conclude that the Greek colony of Metaponto included large numbers of people with diverse geographical origins, whereas the indigenous Italic communities of the surrounding hinterland exhibited high levels of homogeneity and cohesion. Copyright © 2016 John Wiley & Sons, Ltd.     

Cultural Changes in Funeral Rites During the Neolithic in the Northeast of the Iberian Peninsula? The Cave of Pantà de Foix (Barcelona)

During the third millennia bc , there is a change in the funerary patterns of the populations in Catalonia. This novelty usually has been usually related to a change in the economical source of the human groups that become less sedentary as the stockbreeding becomes more important. In the present study, we analyse this change, reflected in the mortuary practices, by the study of diet and health markers such as caries, dental calculus or enamel hypoplasias and of biological affinities based on dental non‐metric traits. It has been included a total amount of 317 permanent teeth from Cova del Pantà de Foix sites, a sepulchral cave found at the south‐west of the city of Barcelona and dates from the third millennia bc . The 74.2% of them present dental calculus deposits, which are usually related to a high protein intake. Nevertheless, the high prevalence of carious lesions (15.3% of the teeth) suggests that the main dietary contribution comes from carbohydrates. Furthermore, when this group is compared with one from the Middle Neolithic Age, which presents a lower calculus prevalence, no biological differences are observed. This lack of differences among these groups denote that the origin of the high amount of calculus deposit is environmental, which is consistent with the elevated observation of hypoplasias of the crown enamel. The absence of dietary, biological and economical differences indicates that the population substrate during the Neolithic in Catalonia is the same and that the transition in the funerary rite is related to a substantial change only regarding to mortuary practices. Copyright © 2014 John Wiley & Sons, Ltd.     

Dietary ecology of extant guanaco (Lama guanicoe) from Southern Patagonia: seasonal leaf browsing and its archaeological implications

The analysis of dietary traits of ungulates through tooth microwear and mesowear has been applied to archaeological sites to investigate seasonal changes in settlements by hunter–gatherers. In this paper we propose to test the hypothesis that tooth microwear (combined to mesowear) is able to indicate seasonality in the diet of extant ungulates in arid habitats (semi-deserts or steppe). The material analyzed comes from six faunal monospecific assemblages of guanaco (Lama guanicoe) resulting from a mass mortality event in winter 2000 near the Cardiel Lake in Southern Patagonia (Province of Santa Cruz, Argentina). Mesowear results indicate that the guanacos from the Cardiel Lake area are mixed feeders, and thus, have a diet that shifts seasonally. Moreover, microwear analysis supports the hypothesis that tooth microwear is able to indicate seasonality in the diet of extant guanaco in arid habitats. The pattern is clear for the winter sample and needs to be confirmed for a summer sample. Consequently, tooth microwear is proposed as a new potential proxy for detecting seasonal occupation in archaeological sites in Patagonia and other arid environments.     

中国入境旅游的空间关联特征及其影响因素探析——基于地理加权回归的视角

国内外关于入境旅游的研究已有丰富积累,但现有关于我国入境旅游影响因素的研究均较少考虑地理邻近与空间关联性、空间非平稳性等特征。本文基于修正的旅游引力模型,首次运用地理加权回归模型,探析经济外向度、旅游资源和地理距离对我国31个省域入境旅游影响的空间差异。研究表明：入境游客在空间上具有正相关性（空间依赖性）和集聚特征;经济外向度和旅游资源对入境游客数量都有积极的影响,旅游资源的促进作用相对较大,而地理距离的增加对入境游客数量有负向的影响。并且,各影响因素的系数存在空间非平稳性,经济外向度和地理距离估计系数形成了以东北地区为核心,不断向西南方向扩散的圈层;相反的是,旅游资源对入境旅游的作用程度形成了由西南向东北地区逐渐递减的格局。研究也发现,邻近地区的入境游客数量对本地区具有正向影响,境外游客从目的地向周边地区扩散,省区之间存在空间溢出效应。     

American Conservatism 2012: A Historical Perspective

Abstract

This essay examines the peculiar history of American political thought to seek a possible explanation for why conservatism in the United States remains a movement without a spokesperson or a platform to which all citizens of this country who describe themselves as conservative can subscribe. The primary cause of these problems appears to be a serious mismatch between the traditional conservative traits of caution and limits and the historic American spirit of dynamic change and boundless optimism.     

Was Civil War surgery effective?

During the U.S. Civil War surgeons performed a vast number of surgeries. Whether surgery increased wounded soldiers’ chances of survival has been debated ever since. I analyze a unique observational data set gathered by Dr. Edmund Andrews, a surgeon with the 1st Illinois Light Artillery. I use Dr. Andrews’s data, model selection tools, and doubly robust estimation methods to estimate treatment effects from surgery. I find that surgery increased wounded soldiers’ chances of survival by 0.09–0.16, depending on the specific model of surgical procedure.     

上海市共享住宿时空格局及影响因素识别

本文以Airbnb共享住宿为研究对象,通过GIS空间分析工具对上海市2010-2019年期间共享住宿空间演变与形成机理进行了初步探讨。结果表明：①上海市共享住宿经历了自发萌芽-快速增长-稳步发展三个主要阶段;②上海市共享住宿正相关性逐年增强,空间聚集态势明显,局部格局整体呈现中心高、外围低的分布特征,研究期内逐渐由西北-东南向东北-西南方向扩散;③道路密度、经济水平、房源供给、服务群体与空间集聚对上海市共享住宿分布格局具有显著影响,并通过制约机制、供需机制、触发机制影响共享住宿选址布局,经过个体与时间积累效应,最终形成上海市共享住宿空间动态演化特征。     

城市断裂点理论的验证、扩展及应用

P. D. Converse提出的城市断裂点理论被广泛用来确定城市的空间影响范围和城市经济区的划分。由于该理论仅给出了每两个城市间一个断裂点的计算公式,在实际应用中就出现了多种空间分割方法。分析表明,许多方法是不可行、不严密的。本文通过对比分析Voronoi图和城市断裂点理论的性质,提出了扩展断裂点理论和断裂弧的概念。并证明:在匀质平面区域内,如果两个城市点的权重相同,那么其吸引范围的分界线是这两个城市点连线的垂直平分线;如果它们的权重不同,那么其吸引范围的分界线是一个圆弧;平面内所有断裂点的轨迹分别构成常规Voronoi图和加权Voronoi图,并且每个城市点的权重分别等于其中心性强度值的平方根。最后,以河南省为例进行了城市空间影响范围和城市经济区划分的应用分析。     

基于加权平均旅行时间的浙江省交通可达性时空格局研究

以浙江省69个县(市)为研究对象,利用1996、2004、2012年路网数据,借助ArcGIS网络分析功能,采用基于城镇综合发展水平的加权平均旅行时间指标,探讨浙江省综合交通网络中节点城镇可达性及其时空演变特征。研究结果表明:①1996-2012年,各城镇可达性均出现不同程度提高,彼此间联系趋于紧密;②城镇可达性存在空间分异,且提升幅度各异,均衡化趋势明显;③城镇可达性空间格局变化大,逐渐向以"四大都市区"为中心向四周递增的"∏型"多级空间结构转变。总体上来看,城镇可达性变化及空间格局演变体现了区域统筹发展的战略要求。     

Investigating space-time patterns of regional industrial resilience through a micro-level approach: An application to the Italian wine industry

This paper introduces a new methodology to identify space-time patterns of regional resilience using a micro-level approach. The novel empirical tool combines geographically weighted regression with panel stochastic frontier analysis with endogenous covariates. The analysis is implemented on a panel of farm holdings operating in the Italian wine industry, focusing on the impact of a major institutional change. The results show the effectiveness of the new procedure in identifying geographical clusters of wine producers who reacted to the shock in similar ways. The responses are found to be homogeneous within specific territories and heterogeneous between regions.