Comments on the Impacts of Climatic Variability and Population Growth on Virgin Anasazi Cultural Development

1996 ◽  
Vol 61 (2) ◽  
pp. 414-418 ◽  
Author(s):  
James R. Allison
Keyword(s):  
Population Growth ◽  
Population Size ◽  
Climatic Change ◽  
Twelfth Century ◽  
Climatic Variability ◽  
Cultural Development ◽  
Climatic Variation ◽  
Climatic Data ◽  
Radiocarbon Dates ◽  
Virgin Anasazi

Larson and Michaelsen (1990) suggest that Virgin Anasazi cultural development can be explained as a response to population growth and climatic variation. They present demographic and climatic data to argue that abandonment of the Virgin Anasazi region was a response to a severe mid-twelfth century drought. Reconsideration of their data shows that Virgin Anasazi populations probably did not grow or decline as rapidly as they suggest. Further, radiocarbon dates suggest that the Virgin Anasazi occupied the area until the late thirteenth century. The Virgin Anasazi abandonment did not coincide with the twelfth-century drought, and cannot be explained solely by reference to population size and climatic change.

Population Fluctuation and the Adoption of Food Production in Prehistoric Korea: Using Radiocarbon Dates as a Proxy for Population Change

Radiocarbon ◽  
2017 ◽  
Vol 59 (6) ◽  
pp. 1761-1770 ◽  
Author(s):  
Yongje Oh ◽  
Matthew Conte ◽  
Seungho Kang ◽  
Jangsuk Kim ◽  
Jaehoon Hwang
Keyword(s):  
Probability Distribution ◽  
Population Growth ◽  
Food Production ◽  
Population Change ◽  
Population Pressure ◽  
Population Fluctuation ◽  
Intensive Agriculture ◽  
Rice Farming ◽  
Radiocarbon Dates ◽  
Transition To Agriculture

AbstractPopulation growth has been evoked both as a causal factor and consequence of the transition to agriculture. The use of radiocarbon (14C) dates as proxies for population allows for reevaluations of population as a variable in the transition to agriculture. In Korea, numerous rescue excavations during recent decades have offered a wealth of14C data for this application. A summed probability distribution (SPD) of14C dates is investigated to reconstruct population trends preceding and following adoptions of food production in prehistoric Korea. Important cultivars were introduced to Korea in two episodes: millets during the Chulmun Period (ca. 6000–1500 BCE) and rice during the Mumun Period (ca. 1500–300 BCE). The SPD suggests that while millet production had little impact on Chulmun populations, a prominent surge in population appears to have followed the introduction of rice. The case in prehistoric Korea demonstrates that the adoption of food production does not lead inevitably towards sustained population growth. Furthermore, the data suggest that the transition towards intensive agriculture need not occur under conditions of population pressure resulting from population growth. Rather, intensive rice farming in prehistoric Korea began during a period of population stagnation.

Ramification of Global and Local Climatic Variability on Resurgent Cases of Dengue in Delhi, India

2021 ◽  
Vol 14 (7) ◽  
pp. 32-41
Author(s):  
Netrananda Sahu ◽  
Martand Mani Mishra
Keyword(s):  
Climatic Factors ◽  
Global Climate ◽  
Climatic Variability ◽  
Climatic Variation ◽  
Statistical Tool ◽  
High Positive Correlation ◽  
Local Climate ◽  
Vector Borne Diseases ◽  
Monsoon Index ◽  
Vector Borne

It has become evident that the global climate is changing rapidly over the past few decades. The variation and change in the global climatic factors have a notable impact on the local climate of a region. The changing climate is widely regarded as one of the most serious global health threats of the 21st century. Among various kinds of diseases, the most vulnerable to these changes are vector-borne diseases. In the Indian context, particularly Delhi city is the most vulnerable to dengue, a kind of vector-borne disease having its highest impact. We sought to identify and explore the correlation and influence of the global climatic phenomena and local climatic factors with the reported number of dengue cases in Delhi. The temporal expansions of reported dengue cases in Delhi have a variation from its first major outbreak in the city during the year 1996 to 2015. A statistical tool like Pearson Product Moment Correlation (PPMC) is used in this study to establish the interrelationship and the level of impact and local climatic variation on dengue. An exceptional negative correlation value of r = -0.82 between the monsoon index and the dengue incidences was reported during the positive years and also maintains a very high positive correlation with other global climatic indices. The study here finds that there is a strong correlation of climatic variation which further influences the epidemiology of dengue in Delhi.

scholarly journals Ethnic Immigration Policy Implementation (1992- 2009)

2013 ◽  
pp. 109-117
Author(s):  
Shugatai Amangul
Keyword(s):  
National Identity ◽  
Population Growth ◽  
Policy Implementation ◽  
Population Size ◽  
International Migration ◽  
Immigration Policy ◽  
International Affairs ◽  
Migration Process ◽  
Economic Stability ◽  
Positive Effect

After Kazakhstan declared its independence, it became a large perform­er in the worldwide international migration process. The attraction of social and economic stability (with an increase in the level of liv­ing standard), stable ethno-demographic and population growth, no nationalist struggles as well as positive geopolitical situations, have lead to a huge flow of immigrants to Kazakhstan in the years since independence. In this study, I have suggested that results of the ethnic immigration policy include strengthening the national identity, creating a positive effect on the ethno-demographic outcomes, and increasing the number of the population size over the last nineteen years. DOI: http://dx.doi.org/10.5564/mjia.v0i17.87 Mongolian Journal of International Affairs, No.17 2012: 109-117

scholarly journals Shifts in interregional proportions in population settlement over the territory of Russia in 2002-2017

2019 ◽  
Vol 3 (1) ◽  
pp. 21-37
Author(s):  
Pavel Kirillov ◽  
Alla Makhrova
Keyword(s):  
Population Growth ◽  
Population Size ◽  
Russian Federation ◽  
Turning Point ◽  
Medium Term ◽  
Local Growth ◽  
Population Redistribution ◽  
Migratory Movement ◽  
Federal Districts ◽  
The Russian Federation

Abstract The article deals with the trends of population size changes in the regions of the Russian Federation between 2002 and 2017 on the basis of data of all-Russian population censuses and current statistics. Components of population growth (natural and migratory movement of the population) are analyzed. In order to take into account the current situation of population size changes in the regions, which are largely of a “turning point” nature and partly inconsistent with the medium-term dynamics since the 2002 Census, the analysis is focused on the period from 2014 to 2017. The paper presents estimates of population size shifts at regional and macro-regional levels, identifies general and local growth centers and depopulation zones. Conclusions are drawn about general shifts in the proportions of population settlement over the territory of Russia and in certain macro-regions (federal districts). General conclusions about the trends of population redistribution across the territory of the country are given in the final part of the study.

Monitoring Agricultural Drought Using El Niño and Southern Oscillation Data

2005 ◽  
Author(s):  
Lino Naranjo Díaz
Keyword(s):  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
Climatic Variability ◽  
Past Century ◽  
Climatic Data ◽  
Weather Patterns ◽  
El Niño Events ◽  
Ring Analysis ◽  
El Nino Events

Almost all the studies performed during the past century have shown that drought is not the result of a single cause. Instead, it is the result of many factors varying in nature and scales. For this reason, researchers have been focusing their studies on the components of the climate system to explain a link between patterns (regional and global) of climatic variability and drought. Some drought patterns tend to recur frequently, particularly in the tropics. One such pattern is the El Niño and Southern Oscillation (ENSO). This chapter explains the main characteristics of the ENSO and its data forms, and how this phenomenon is related to the occurrence of drought in the world regions. Originally, the name El Niño was coined in the late 1800s by fishermen along the coast of Peru to refer to a seasonal invasion of south-flowing warm currents of the ocean that displaced the north-flowing cold currents in which they normally fished. The invasion of warm water disrupts both the marine food chain and the economies of coastal communities that are based on fishing and related industries. Because the phenomenon peaks around the Christmas season, the fishermen who first observed it named it “El Niño” (“the Christ Child”). In recent decades, scientists have recognized that El Niño is linked with other shifts in global weather patterns (Bjerknes, 1969; Wyrtki, 1975; Alexander, 1992; Trenberth, 1995; Nicholson and Kim, 1997). The recurring period of El Niño varies from two to seven years. The intensity and duration of the event vary too and are hard to predict. Typically, the duration of El Niño ranges from 14 to 22 months, but it can also be much longer or shorter. El Niño often begins early in the year and peaks in the following boreal winter. Although most El Niño events have many features in common, no two events are exactly the same. The presence of El Niño events during historical periods can be detected using climatic data interpreted from the tree ring analysis, sediment or ice cores, coral reef samples, and even historical accounts from early settlers.

scholarly journals 692. Effects of Regional Climatic Variability on West Nile Virus Outbreaks in the United States

2018 ◽  
Vol 5 (suppl_1) ◽  
pp. S249-S250
Author(s):  
Raghesh Varot Kangath ◽  
Buddhika Maduraperuma ◽  
Juliana Souza Borges ◽  
Rajasreepai Ramachandrapai
Keyword(s):  
United States ◽  
High Temperature ◽  
Population Density ◽  
Climatic Variability ◽  
The United States ◽  
Climatic Data ◽  
Cca Ordination ◽  
Neuroinvasive Disease ◽  
South Central ◽  
Risk Areas

Abstract Background Transmission of WNV to humans in the United States typically occurs between June and September since warm temperatures accelerate mosquito life cycle. Precipitation can cause increase in aquatic breeding but outbreaks often depends upon human water management. We examine epidemiology, patterns of WNV disease transmission, and identification of high-risk areas in the United States from 2003 to 2014. Methods Trends and relationships of WNV cases and climatic factors were analyzed among the regions of the United States from 2003 to 2014. Human WNV tabulate data and climatic data were obtained from Centers for Disease Control, and NOAA and Climate Data Guide, respectively. Canonical correspondence analysis (CCA) was performed using variables: (i) neuroinvasive disease cases, non-neuroinvasive disease cases, deaths, presumptiveviremic blood donors, (ii) precipitation, temperature, Palmer Drought Severity Index (PDSI) and population density. The CCA ordination was explained the variability between WNV disease cases andclimatic variables. Biplots were used to visualize the associations between WNV cases and climatic anomalies. Results We compared the state wise WNV disease cases in relation to climatic and population density in the United States from 2003 to 2014. A total of 4,064 cases in 2006, 956 cases in 2010 and, 2,141 cases in 2014 were reported in the 32 states of the United States. Colorado state reported the highest WNV cases in 2003 (2,947 cases; 33%), followed by Texas in 2012 (1,868 cases; 35%) and California in 2014 (801 case; 37%). CCA ordination showed distinguishable clustering patterns between south central (Texas, Louisiana, Mississippi, Arkansas, and Oklahoma) and northern Great Plains (North Dakota, South Dakota, and Nebraska) regions (Figure 1). High temperature and prolong drought were the most important variable predictor for high WNV outbreak. Conclusion Vector control methods focusing on prevention must be implemented to avoid epidemics of WNV if high temperature is leading to an unusual drought especially at the risk areas, such as Texas and California. However, high temperature with moist spell anomalies in the south central region showed a negative influence on WNV outbreak. Disclosures All authors: No reported disclosures.

scholarly journals Long-term trends of land use and demography in Greece: A comparative study

The Holocene ◽  
2019 ◽  
Vol 29 (5) ◽  
pp. 742-760 ◽  
Author(s):  
Erika Weiberg ◽  
Andrew Bevan ◽  
Katerina Kouli ◽  
Markos Katsianis ◽  
Jessie Woodbridge ◽  
...  
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Comparative Study ◽  
Bronze Age ◽  
Climatic Variability ◽  
Agricultural Practices ◽  
Archaeological Site ◽  
Demographic Development ◽  
Radiocarbon Dates ◽  
The Impact

This paper offers a comparative study of land use and demographic development in northern and southern Greece from the Neolithic to the Byzantine period. Results from summed probability densities (SPD) of archaeological radiocarbon dates and settlement numbers derived from archaeological site surveys are combined with results from cluster-based analysis of published pollen core assemblages to offer an integrated view of human pressure on the Greek landscape through time. We demonstrate that SPDs offer a useful approach to outline differences between regions and a useful complement to archaeological site surveys, evaluated here especially for the onset of the Neolithic and for the Final Neolithic (FN)/Early Bronze Age (EBA) transition. Pollen analysis highlight differences in vegetation between the two sub-regions, but also several parallel changes. The comparison of land cover dynamics between two sub-regions of Greece further demonstrates the significance of the bioclimatic conditions of core locations and that apparent oppositions between regions may in fact be two sides of the same coin in terms of socio-ecological trajectories. We also assess the balance between anthropogenic and climate-related impacts on vegetation and suggest that climatic variability was as an important factor for vegetation regrowth. Finally, our evidence suggests that the impact of humans on land cover is amplified from the Late Bronze Age (LBA) onwards as more extensive herding and agricultural practices are introduced.

The Wright–Fisher model with varying selection

1986 ◽  
Vol 23 (02) ◽  
pp. 504-508
Author(s):  
N. C. Weber
Keyword(s):  
Population Growth ◽  
Population Size ◽  
Sufficient Conditions ◽  
Selective Advantage ◽  
Fisher Model ◽  
Ultimate Homozygosity ◽  
Varying Population

The Wright–Fisher model with varying population size is examined in the case where the selective advantage varies from generation to generation. Models are considered where the selective advantage is not always in favour of a particular genotype. Sufficient conditions in terms of the selection coefficients and the population growth are given to ensure ultimate homozygosity.

Radiocarbon dates as estimates of ancient human population size

Anthropocene ◽  
2016 ◽  
Vol 15 ◽  
pp. 3-12 ◽  
Author(s):  
Michelle A. Chaput ◽  
Konrad Gajewski
Keyword(s):  
Population Size ◽  
Human Population ◽  
Radiocarbon Dates
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