Distribution of annual Trifolium species in Morocco

1993 ◽  
Vol 44 (6) ◽  
pp. 1303 ◽  
Author(s):  
PE Beale ◽  
M Bounejmate ◽  
A Lahlou ◽  
DB Marx ◽  
S Christiansen
Keyword(s):  
Environmental Factors ◽  
Seed Yield ◽  
Phosphorus Content ◽  
Climatic Factors ◽  
Natural Distribution ◽  
Factors Affecting ◽  
Determinant Factors ◽  
Number Of Species ◽  
The Relationship

An ecogeographic survey was conducted in six key agricultural zones in Morocco to study the abundance and the relationship between the natural distribution of annual Trifolium species and environmental factors. Sixteen species of annual Trifolium species were identified. Most prolific was T. scabrum and the least were T. striatum and T. bocconei. Fifty-five percent of the sites had no Trifolium and the average number of species per site was 2.2. An average seed yield of 4.8 kg ha-1 was obtained. Both soil and climatic factors affected the occurrence of Trifolium species. Rainfall, pH and phosphorus content were the most determinant factors affecting the distribution of Trifolium species in Morocco.

scholarly journals Climatic Factors Affecting Density of Aedes aegypti (Diptera: Culicidae) in Kassala City, Sudan 2014/2015

2019 ◽  
Vol 2 (2) ◽  
pp. 58-68
Author(s):  
Ahmed RM ◽  
Hassan SM ◽  
Elrahman AH
Keyword(s):  
Environmental Factors ◽  
Aedes Aegypti ◽  
Climatic Factors ◽  
Larval Instar ◽  
Hemorrhagic Fever ◽  
Factors Affecting ◽  
Autumn Season ◽  
Vector Population ◽  
The Relationship ◽  
The City

Transmission of Dengue Hemorrhagic fever by Aedes aegypti mosquito is influenced by several environmental factors, namely temperature, humidity, and rainfall. This study aims at identifying the relationship between environmental factors and dengue vector population density. A longitudinal entomological study was performed in the city of Kassala, Sudan, in 20 households in each of the 20 clusters during the three seasons of 2014 and 2015. Data were collected using spotlight in any water-holding container where immature stages of Aedes spp. were detected. Immature mosquitoes were counted and classified into larvae and pupae. Ambient temperature and relative humidity in each cluster were recorded, and the total rainfall of Kassala City was obtained from the main Meteorological Station in Khartoum. There was a significant positive correlation between rainfall and number of Ae. aegypti females at Garb Algash and Khatmia areas. Larval instar 4 and pupae were positively correlated with high humidity at Khatmia and Altora areas. In autumn season, there was no strong correlation of all the stages with all climatic variables. There was also positive significant correlation between ambient low temperature and number of females in autumn season.

scholarly journals Caracterización ficológica en manantiales de la cuenca baja del sistema hidrológico del Pánuco, México

2017 ◽  
pp. 21 ◽  
Author(s):  
Javier Carmona-Jiménez ◽  
Gustavo Montejano-Zurita
Keyword(s):  
Environmental Factors ◽  
Light Intensity ◽  
Current Velocity ◽  
Growth Forms ◽  
Factors Affecting ◽  
Similarities And Differences ◽  
The Relationship

The results of a phycofloristic study on three springs in the Huasteca Potosina region are presented; 67 species are reported. Floristic similarities and differences among the springsare analized, as well as the relationship between species and environmental factors. Microhabitas were defined in the springs as well as the principal algal asociations that characterize them. Light intensity and current velocity are the most important factors affecting the predominant growth forms present in this type of habitat.

scholarly journals Method for the quantitative evaluation of ecosystem services in coastal regions

PeerJ ◽  
2019 ◽  
Vol 6 ◽  
pp. e6234
Author(s):  
Tomonari Okada ◽  
Yugo Mito ◽  
Erina Iseri ◽  
Toshiyuki Takahashi ◽  
Takanori Sugano ◽  
...  
Keyword(s):  
Ecosystem Services ◽  
Environmental Factors ◽  
Social Systems ◽  
Tidal Flats ◽  
Environmental Conservation ◽  
The State ◽  
Improvement Project ◽  
Factors Affecting ◽  
Environmental Improvement ◽  
The Relationship

Wetlands, tidal flats, seaweed beds, and coral reefs are valuable not only as habitats for many species, but also as places where people interact with the sea. Unfortunately, these areas have declined in recent years, so environmental improvement projects to conserve and restore them are being carried out across the world. In this study, we propose a method for quantifying ecosystem services, that is, useful for the proper maintenance and management of artificial tidal flats, a type of environmental improvement project. With this method, a conceptual model of the relationship between each service and related environmental factors in natural and social systems was created, and the relationships between services and environmental factors were clarified. The state of the environmental factors affecting each service was quantified, and the state of those factors was reflected in the evaluation value of the service. As a result, the method can identify which environmental factors need to be improved and if the goal is to increase the value of the targeted tidal flat. The method demonstrates an effective approach in environmental conservation for the restoration and preservation of coastal areas.

scholarly journals Environmental factors affecting splash erosion in the mountain area (the Western Polish Carpathians)

2018 ◽  
Vol 36 ◽  
pp. 97-111
Author(s):  
Małgorzata Kijowska-Strugała ◽  
Krzysztof Kiszka
Keyword(s):  
Environmental Factors ◽  
Erosion Rate ◽  
Organic Matter Content ◽  
Matter Content ◽  
Slope Gradient ◽  
Mountain Area ◽  
Factors Affecting ◽  
Splash Erosion ◽  
Polish Carpathians ◽  
The Relationship

The aim of this study was to examine the effects of various environmental factors on splash erosion based on the funnel method under natural conditions. The relationship between splash and wash erosion were also studied. The intermediate timescale study (2012–2016, from May to October) was conducted in the Western Polish Carpathians where Inceptisols predominate. The splash erosion rate (kg m−2) was variable and showed a strong correlation with environmental factors, including rainfall parameters, land use (black fallow, meadow), slope gradient (0°, 11°), and also the particle size of soil and usage time (organic matter content, OM). The splash erosion rate on the slope with black fallow was 95 times higher than in the meadow and up to 20 times higher than in flat area. The average downslope splash erosion was 75% higher than the upslope splash erosion, and the soil particles were detached to maximum heights of 50 cm (downslope). There was a positive correlation between splash erosion and wash and a negative correlation between splash erosion and OM.

The global distribution of tribes of the gramineae in relation to historical and environmental factors

1950 ◽  
Vol 1 (4) ◽  
pp. 355 ◽  
Author(s):  
W Hartley
Keyword(s):  
Environmental Factors ◽  
Climatic Factors ◽  
Global Distribution ◽  
Special Significance ◽  
Average Percentage ◽  
Extensive Survey ◽  
The World ◽  
Present Distribution ◽  
Relationship Of ◽  
The Relationship

An extensive survey of the literature on grass distribution throughout the world has been made to determine the average percentage of species of each of the major grass tribes in the total grass flora. These average percentages for the six largest tribes are as follows: Agrosteae 8.2 per cent. Eragrosteae 8.1 per cent. Andropogoneae 11.9 per cent. Festuceae 16.5 per cent. Aveneae 6.3 per cent. Paniceae 24.7 per cent. The distribution of each of the above tribes is shown on world maps, and the relationship of this distribution to climatic, historical, and taxonomic factors is discussed. It is shown that the present distribution of each of the major tribes can be explained by a few readily recognizable factors. Climatic factors are of primary importance in relation to grass distribution and winter temperature has special significance.

A CONCEPTUAL MODEL FOR DEPICTING THE RELATIONSHIP BETWEEN ENTREPRENEURSHIP AND THE ENVIRONMENTAL FACTORS IN SINGAPORE

1994 ◽  
Vol 01 (03n04) ◽  
pp. 449-472 ◽  
Author(s):  
SOKE-YIN WONG ◽  
CHARMAINE LAI-YEEN WONG ◽  
RICKY YUET-KEE KWAN ◽  
VATVANI CHANDRA GANSHAM
Keyword(s):  
Environmental Factors ◽  
External Factors ◽  
Personal Attributes ◽  
Internal Factors ◽  
Factors Affecting ◽  
Technological Advances ◽  
Market Opportunities ◽  
Social And Cultural Factors ◽  
The Relationship

The degree to which environmental factors foster/hinder entrepreneurship is unique to each individual entrepreneur. It is hence not possible to describe the “average” entrepeneur and the “typical” process of venture creation and management. As such, in this paper, a new model conceptualising the relationship between entrepreneurship and environmental factors is proposed. In this model, entrepreneurship (E) is conceptualised as being a function of the environmental factors (Ef) and personal attributes of the entrepreneur (Pa). Hence, E=f(Ef, Pa). The environmental factors affecting E are further categorised into a set of internal factors (Fin) and a set of external factors (Fex). Several studies have already been undertaken to examine the personal attributes of entrepreneurs in Singapore which explains for their success/failure. This study focuses on Ef in Singapore to assess the favorability of Singapore’s environment in promoting entrepreneurship and entrepreneurship development. A set of questionnaire designed for this purpose was sent to over 100 entrepreneurs, from which we received 44 usable responses. Environmental factors surveyed include financing, government assistance schemes, availability of labour, opportunity cost, competition by multi-national and government-related companies, the education system, social and cultural factors, technological advances and market opportunities. A detailed case study was also conducted with a successful local entrepreneur to further refine and validate our findings. Our findings appear to indicate that in Singapore, external factors are more conducive in fostering entreneurship than the internal factors.

Factors Affecting Job Satisfaction In Two Automotive Industries In Malaysia

2012 ◽  
Author(s):  
Siti Zawiah Dawal ◽  
Zahari Taha
Keyword(s):  
Job Satisfaction ◽  
Environmental Factors ◽  
Work Experience ◽  
Job Characteristics ◽  
Work Design ◽  
Manufacturing Companies ◽  
Automotive Manufacturing ◽  
Factors Affecting ◽  
Multiple Choice Questionnaire ◽  
The Relationship

Satu tinjauan telah dijalankan untuk menyiasat perhubungan di antara kepuasan kerja, ciri-ciri tugasan dan faktor suasana yang mempengaruhi reka bentuk kerja di dua buah syarikat pembuatan automotif di Malaysia. Matlamat utama kajian adalah untuk menentukan faktor-faktor yang mempengaruhi persepsi pekerja terhadap tugas mereka. 170 orang subjek lelaki berumur di antara 18 tahun hingga 40 tahun dengan purata umur 26.8 tahun dengan sisihan piawai (SP) 5.3 tahun dan purata pengalaman kerja 6.5 tahun dengan SP 4.9 tahun telah mengambil bahagian. Satu set soalan pelbagai pilihan telah dihasilkan dan maklumat dikumpulkan dengan cara menemuduga pekerja di kilang pengeluaran tersebut. Hasil tinjauan menyokong kajian dengan menunjukkan bahawa ciri-ciri tugasan dan faktor-faktor suasana mempunyai hubungan yang signifikan dengan kepuasan kerja. Kata kunci: Kepuasan kerja, ciri-ciri tugasan, faktor-faktor suasana, reka bentuk kerja, industri automotif A survey was conducted to investigate the relationship between job satisfaction, job characteristics and environmental factors that affect work design in two automotive manufacturing companies in Malaysia. The aim of the study is to determine the factors that influence employees’ perception towards their work. 170 male subjects between the ages of 18 to 40 years with the mean age of 26.8 and standard deviation (SD) of 5.3 years and mean work experience of 6.5 and SD of 4.9 years were involved. A set of multiple choice questionnaire was developed and data was collected by interviewing the employees at the production plants. The survey focused on job satisfaction, job characteristics and environmental factors. The results showed that job characteristics and environmental factors were significantly related to job satisfaction. Key words: Job satisfaction, job characteristic factors, environmental factors, work design, automotive industry

scholarly journals Factors Affecting the Presence and the Diversity of Bryophytes in the Petrifying Sources Habitat (7220) in Wallonia and the Brussels-Capital Region, Belgium

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
J.-M. Couvreur ◽  
G. San Martin ◽  
A. Sotiaux
Keyword(s):  
Species Richness ◽  
Environmental Factors ◽  
Community Composition ◽  
Linear Models ◽  
Canopy Cover ◽  
Individual Species ◽  
Factors Affecting ◽  
The Relationship ◽  
Main Factor

Bryological composition, water chemistry, and environmental factors were characterized on 67 Belgian travertines. We explore the relationship between these environmental factors and the community composition, species richness, or presence of individual species using Redundancy Analysis with Hellinger’s transformation (tb-RDA) or Generalized Linear Models (GLMs). The best variables explaining the community composition are slope, NO3, NH4, and PO4. The species richness is negatively related to canopy cover and PO4.Palustriella commutatatends to be more frequent when the slope is steeper and to a lesser degree when the canopy cover is lower.Eucladium verticillatumtends to be slightly more frequent when canopy cover and NH4concentrations are lower.Cratoneuron filicinumis more frequent at higher Mg concentrations andPellia endiviifoliais more frequent at lower PO4concentrations and higher NO3concentrations.Brachythecium rivulareshowed wide ecological amplitude and almost none of the tested environmental factors seem to be related to its presence. The study identifies eutrophication as the main factor responsible for habitat deterioration. Practical indications on the best ways to maintain or to enhance the quality of these petrifying sources are given.

scholarly journals Large-scale vs. small-scale factors affecting flowering patterns in Senecio macrophyllus M.BIEB., a long-lived perennial

2012 ◽  
Vol 59 (1) ◽  
pp. 233-239 ◽  
Author(s):  
Bożenna Czarnecka
Keyword(s):  
Soil Moisture ◽  
Environmental Factors ◽  
Light Intensity ◽  
Large Scale ◽  
Climatic Factors ◽  
Small Scale ◽  
Herbaceous Plant ◽  
Factors Affecting ◽  
Reproductive Patterns ◽  
Scale Factors

The aim of the study was to establish which of environmental factors affect flowering patterns in a long-lived herbaceous plant <i>Senecio macrophyllus</i>. The study was conducted in the population of Biała Góra (White Mountain) near Tomaszów Lubelski in the years 1989-2004. The results allow to conclude that in the reproductive patterns of the analysed population small-scale environmental factors (soil moisture and trophism, light intensity) are more important than large-scale climatic factors (temperature, precipitation), which to a comparable extent affect the plants in the whole population area.

scholarly journals Environmental Factors Affecting Fleece Traits in Raeini Cashmere Goat

2010 ◽  
Vol 15 ◽  
pp. 15
Author(s):  
Mohammed Salehi ◽  
Masood Asadi-Fozi ◽  
Ahmad Mirhadi ◽  
Majid Afshar
Keyword(s):  
Environmental Factors ◽  
Fixed Effects ◽  
Production Management ◽  
Fiber Diameter ◽  
Management Systems ◽  
Cashmere Goat ◽  
Breeding Programs ◽  
Factors Affecting ◽  
Cashmere Goats ◽  
The Relationship

The objective of this study was to evaluate some environmental factors (sex, age and management system) on fibrecharacteristics of Raeini Cashmere goats in Baft stations (BS) and of Raeini Cashmere goats raised in nomadic conditions (NC) as commercial flocks. Fiber samples including cashmere and hair were taken from 150 and 120 Raeini Cashmere goats (aged 1-8 years old) from BS and NC, respectively. The Fleece traits measured included staple length (SL), percentage of cashmere in fleece (C), percentage of guard hair in fleece (H), cashmere's mean fiber diameter (CMFD) and the coefficient of variation of cashmere's fiber diameter (CVFD). Mean SL, C, H, CMFD and CVFD in BS were 6.35 ±0.1 cm, 66.51± 0.72 %, 33.5 ± 0.72 %, 20.19 ±0.11 micron and 19.57± 0.21% and thosein NC were 5.62 ± 0.1 cm, 69.06 ± 0.74 %, 30.94 ±0.74 %, 19.53±0.15 micron and 17.88 ± 0.19 %, respectively. There were significant differences (P<0.05) between the two production management systems for all traits investigated. The value for C was significantly higher in males than females (P<0.05). The results showed that the fleece traits were affected by age. However, the effect of age on these traits was not the same. Significant phenotypic correlations were found between SL and CMFD (0.16) and between SL and CVFD (0.13). The results of this study indicated that the fixed effects of age, sex and management systems as well as the relationship between fleece traits should  be considered in the Raeini Cashmere goat breeding programs. 

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