The impact of utilization of palm products on the population structure of the vegetable ivory palm (Hyphaene petersiana, arecaceae) in North-Central Namibia

1995 ◽  
Vol 49 (4) ◽  
pp. 357-370 ◽  
Author(s):  
S. Sullivan ◽  
T. L. Konstant ◽  
A. B. Cunningham
Keyword(s):  
Population Structure ◽  
North Central ◽  
Vegetable Ivory ◽  
The Impact

Vulnerability to Natural Disaster and Welfare Effect: A Case Study of Flood Risk in Vietnam’s North Central Region

2021 ◽  
pp. 002190962199349
Author(s):  
Manh-Hung Nguyen ◽  
Dung P Le ◽  
Thang T Vo
Keyword(s):  
Flood Risk ◽  
Sampling Method ◽  
Household Survey ◽  
North Central ◽  
Household Level ◽  
Central Vietnam ◽  
Housing Costs ◽  
Household Vulnerability ◽  
The Impact

This article investigates the impact of flood risk on vulnerability and welfare at the household level in Vietnam. The analytical sample is taken from a household survey conducted in a north central Vietnam community through a three-stage stratified random sampling method. The propensity score matching approach is employed to compare various welfare indicators between flooded and non-flooded households. This study finds that flooding results in significant income losses and imposes higher costs of living, especially housing costs. The two types of households are vulnerable, implying that other natural disasters or socio-economic disadvantages may have adverse effects on households’ livelihoods. The insignificant effect of floods on vulnerability indicates that the flooded households can cope with floods to some extent. However, contrary to family support, formal coping strategies are insufficient or ineffective at reducing household vulnerability to floods.

scholarly journals Cryptosporidium sp. infection in the broiler chickens and turkeys on farms in north central Algeria

2021 ◽  
Vol 53 (4) ◽  
Author(s):  
Sihem Guechtouli ◽  
Nora Mimoune ◽  
Chafik-Reda Messai ◽  
Omar Salhi ◽  
Rachid Kaidi ◽  
...  
Keyword(s):  
High Frequency ◽  
Broiler Chickens ◽  
Climatic Conditions ◽  
Bursa Of Fabricius ◽  
Tissue Samples ◽  
North Central ◽  
Genetic Potential ◽  
Hygienic Measures ◽  
The Impact ◽  
Poor Management

This study aimed to determine the prevalence of cryptosporidiosis in broiler chickens and turkeys and the factors that can influence its development, the precision of the most frequent sites of Cryptosporidium, and the severity of lesions associated with the disease. From October 2019 to September 2020, the prevalence of Cryptosporidia infection was determined on 22 farms located in north central Algeria. For each farm, weekly visits were conducted during the study period and information on the type of farming and health status was collected. At these farms, 98 chickens and 22 turkeys were examined and clinical lesions recorded. Analyses of faeces, tissue samples and scrapings made from the intestine, bursa of Fabricius, trachea, cloaca and proventriculus revealed a prevalence of 55% at chicken farms. The age of chickens was found to be a significant factor, with a high frequency of the disease observed in chickens aged between 10 to 50 days with a maximum between 31 and 40 days (84.62%). The parasite was not detected in chickens younger than 7 days. The most common site of Cryptosporidium sp. was the bursa (24.2%), followed by the trachea (21.5%), cloaca (18.9%), intestine (16.3%), and proventriculus (6.6%). In turkeys, the overall prevalence was 41%. The bursa was the most infected organ (23.81%), followed by the cloaca (15.79%) and intestine (9%). For both avian species, data confirmed the impact of season, strain (genetic potential), and rearing conditions on the prevalence of Cryptosporidium sp. To conclude, our results showed that Cryptosporidium was very common on these farms, and was related mainly to climatic conditions and poor management, particularly hygienic measures.

scholarly journals The Importance of Economic Security in Shaping Cultural Behaviors Influenced by Progressive Globalization Processes

2020 ◽  
Vol 6 (1) ◽  
pp. 89-94
Author(s):  
Daniel Kucharek
Keyword(s):  
Sustainable Development ◽  
Population Structure ◽  
Developed Countries ◽  
Economic Security ◽  
Armed Conflicts ◽  
Cultural Patterns ◽  
Cultural Changes ◽  
Economic Migration ◽  
Diverse World ◽  
The Impact

One of the most transparent manifestations of globalization processes currently occurring is the phenomenon of economic migration. It is associated with the movement of large masses of people from poor, economically underdeveloped regions often disturbed by armed conflicts to economically developed countries with already shaped prosperity. Migration processes pose many economic, social and cultural problems that discourage the population of wealthy countries from receiving incoming migrants. This article was organized in order to firstly consider the impact of economic migration on the phenomenon of changes in the population structure and thus cultural changes that might result from it. The next stage of the conducted analysis refers to the problem of commodification of artworks created within the area of culture. An important effect of the conducted research is to draw attention to the phenomenon of blurring differences, and, as a result, the emergence of widely accepted, supranational cultural patterns. Finally, the undertaken research identifies possible opportunities and threats for sustainable development of culture on an economically diverse world.

scholarly journals Research on China's Population Structure in the New Situation

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Jingxuan Cui ◽  
Mengshuai Yin ◽  
Zerong Liu
Keyword(s):  
Population Structure ◽  
Rural Population ◽  
Regression Equation ◽  
Multiple Regression Equation ◽  
Female Ratio ◽  
Men And Women ◽  
Child Policy ◽  
Dynamic Perspective ◽  
The Difference ◽  
The Impact

To analyze the impact of the “two-child policy” on the population size and structure, first of all, the birth rate, the ratio of men and women, and the ratio of urban and rural population are used as indicators. Before and after the dispersion, then establish a PDE model, and compare it with the population predicted by the gray forecast to analyze the mitigation of the ageing of the second child policy; continue to analyze the impact of changes in the population structure on the national economy, and select the male and female ratio and the labor population The urban-rural population ratio is used as an index to establish a multiple regression equation for analysis, and a related regression equation is obtained. Finally, the future marriage problem is analyzed, considering only the difference in the number of men and women entering the marriageable period at the same time. The difference in the number of marriageable populations is analyzed through the difference in the number of men and women born at birth, focusing on a dynamic perspective.

scholarly journals Effect of unfavourable population structure on estimates of heritability, systematic effects and breeding values

2008 ◽  
Vol 51 (6) ◽  
pp. 601-610
Author(s):  
A. P. Kominakis
Keyword(s):  
Population Structure ◽  
Mean Squared Error ◽  
Heritability Estimate ◽  
Breeding Values ◽  
Parameter Estimations ◽  
Squared Error ◽  
Heritability Estimation ◽  
Population Structures ◽  
Systematic Effects ◽  
The Impact

Abstract. Empirical estimations of heritability, systematic effects and predictions of sires’ breeding values (BVs) were obtained under various population structures for simulated populations consisted of n = 400 animals in 5 herds for a trait of medium heritability (h2 = 0.30). An infinitesimal additive genetic animal model was assumed while simulating data. Population structure was varied to allow for good and poor connectedness across herds and (non)random association between the genetic and the environmental effects. The impact of the various population structures on the parameter estimation(s) was assessed using Mean Squared Error (MSE) and Pearson’s correlations. Allowing sires to have progenies in more than one herd (good herd connectedness) and random use of sires across herds generally resulted in good parameter estimations. Poor connectedness significantly affected herd effects estimation and BV prediction but not heritability estimation as long as random usage of sires across environments was guaranteed. Selective use of the best sires in the best herds along with poor connectedness resulted in poorest estimations of all parameters examined. In the latter case, heritability was seriously underestimated (h2 = 0.06) while highest error, lowest accuracies for the BVs and a remarkable underestimation of the genetic gain were observed. Use of reference sires on a natural mating basis to create genetic links between herds has served a good solution for both heritability and BVs estimation under unfavorable structure. Mating 0.25 of the herd ewes with reference sires resulted in a heritability estimate close to the simulated one. Significantly better estimates of systematic effects and BVs were, however, obtained when 0.5 of the herd ewes were mated by reference sires.

scholarly journals Effects of logging on Virola surinamensis in an Amazonian floodplain forest

2014 ◽  
Vol 15 (3) ◽  
pp. 1-8
Author(s):  
Leandro V. Ferreira ◽  
Denise A. Cunha ◽  
Pia Parolin
Keyword(s):  
Population Structure ◽  
Genetic Resources ◽  
Economic Value ◽  
Timber Species ◽  
Floodplain Forests ◽  
Male And Female ◽  
Conservation Program ◽  
Priority Species ◽  
New Policies ◽  
The Impact

Virola surinamensis is a dioecious timber species of Amazonian floodplain forests. It is threatened by extinction and a priority species in the conservation program of genetic resources with high economic value for Brazil. The present study was aimed to assess the population structure of Virola surinamensis and the impact of logging in the estuary region of Brazilian Amazonia. Our data suggest that altering the dioecious population structure by logging likely creates the imbalance of male and female individuals in the population. New policies are needed to protect Virola trees with a special regard on reproductive matriarch trees.

Reply to the comment by Morales et al. on “Population genetics reveal Myotis keenii (Keen’s myotis) and Myotis evotis (long-eared myotis) to be a single species”

2021 ◽  
pp. 423-432
Author(s):  
C.L. Lausen ◽  
Michael F. Proctor ◽  
David Paetkau ◽  
David W. Nagorsen ◽  
Purnima Govindarajulu ◽  
...  
Keyword(s):  
Population Genetics ◽  
Population Structure ◽  
Single Species ◽  
Distinct Species ◽  
Background Information ◽  
Distribution Data ◽  
Supporting Evidence ◽  
Post Mortem ◽  
The Impact ◽  
New Evidence

A.E. Morales et al. (2021. Can. J. Zool. 99(5): 415–422) provided no new evidence to alter the conclusions of C.L. Lausen et al. (2019. Can. J. Zool. 97(3): 267–279). We present background information, relevant comparisons, and clarification of analyses to further strengthen our conclusions. The genesis of the original “evotis–keenii” study in British Columbia (Canada) was to differentiate Myotis keenii (Merriam, 1895) (Keen’s myotis), with one of the smallest North American bat distributions, from sympatric Myotis evotis (H. Allen, 1864) (long-eared myotis), using something other than the suggested post-mortem skull size comparison, but no differentiating trait could be found, leading to the molecular genetics examination of C.L. Lausen et al. (2019). We present cumulative data that rejects the 1979 hypothesis of M. keenii as a distinct species. A.E. Morales et al. (2021) inaccurately portray C.L. Lausen et al.’s (2019) question and results; present inaccurate morphological and outdated distribution data; overstate the impact of homoplasy without supporting evidence; and misinterpret evidence of population structure.

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