Search results for "Community"
showing 10 items of 2132 documents
Mutualistic tree-frugivore interactions in Afrotropical forests : from local ecological knowledge to the identification of network interaction patter…
2022
Frugivory in tropical forests is a major ecological process, as most tree species rely on frugivores for their dispersion, and numerous animal species used fruits as their principal sources of food. However, frugivory networks between plants and animals in Afrotropical forests are poorly described, and the mechanisms shaping them remain largely unexplored. This PhD thesis addresses a structural approach of the frugivory network, a plant-community approach and a methodological approach using local ecological knowledge and cameras.The first chapter describes the frugivory network of Afrotropical forests, based on a compilation of frugivory interactions from the literature that comprised >10,0…
Percorsi relazionali nelle comunità. Minori, buone prassi e rappresentazioni a confronto.
2014
The aim of this thesis was to analyze the context of residential communities for young offenders (Part I) and to analyze the influence of social representations in adolescents and educators (Part II). The first part offers two levels of study on adolescents and on the organizational structure of the community. Adolescents show many problematic levels in the identified variables (Experiences of neglect and abuse during childhood, Attachment Styles, Self-Esteem, Interpersonal Relations, Behavioural problems). No differences between groups of young differentiating according to the reason for placement in community were found. Analysis of community (101 educators from 20 different households) w…
PHENOLOGICAL ADAPTATION OF ANT-DISPERSED PLANTS TO SEASONAL VARIATION IN ANT ACTIVITY
2002
We studied a temperate plant community to examine whether the reproductive phenology of ant-dispersed plants is correlated with seasonal variation in seed dispersal activity of ants. We documented flowering and fruiting peak of 24 ant-dispersed and 251 non-ant-dispersed plant species. To characterize the activity of ants, we quantified the seasonal removal rates of greater celandine (Chelidonium majus) seeds. Ant-dispersed plants flowered on average 5.6 wk and fruited 7.1 wk earlier than those with other dispersal modes. This difference was not caused by variation in growth form or habitat. Mean fruiting peak of ant-dispersed plants was early July. Ant activity was especially high between M…
Shifts in macroalgal communities in relation to some abiotic factors: a functional group approach
2007
The aim of the present study was to test whether the functional group approach is effective in describing changes in community structure, resulting from exposure to different substratum inclination and levels of organic pollution. The results of this study suggest that the functional group approach could detect changes in community structure as response to some abiotic factors. However, since species response is not always a functional group response, this method is difficult to generalize and a better definition of the functional group model is required.
Spatial Distribution of Fungal Communities in an Arable Soil.
2015
Fungi are prominent drivers of ecological processes in soils, so that fungal communities across different soil ecosystems have been well investigated. However, for arable soils taxonomically resolved fine-scale studies including vertical itemization of fungal communities are still missing. Here, we combined a cloning/Sanger sequencing approach of the ITS/LSU region as marker for general fungi and of the partial SSU region for arbuscular mycorrhizal fungi (AMF) to characterize the microbiome in different maize soil habitats. Four compartments were analyzed over two annual cycles 2009 and 2010: a) ploughed soil in 0-10 cm, b) rooted soil in 40-50 cm, c) root-free soil in 60-70 cm soil depth a…
Preliminary observations on fungal endophytic community and mycorrhizal status in symptomless Quercus ilex seedlings
2014
Recently, a study on the Quercus ilex L. decay caused by biotic and abiotic agents has hypothesized alterations on endophytic and mycorrhizal fungal populations. Since holm oak is among the most representative Mediterranean species, that occurs widely in both urban and rural areas, in this work we preliminarly report these symbiotic fungal communities in asymptomatic seedlings, in order to compare these populations with those found in seedlings subjected to water and saline stress. Endophytic fungi were isolated from twigs and leaves and identified by morphological and molecular analysis. The ectomycorrhizal status was evaluated on root samples randomly selected to calculate the percentage …
PROMOTION OF ADULT EDUCATION IN THE INNOVATIVE BUSINESS
2015
The notions of adult education and innovative entrepreneurship have been described and analysed in the article. According to the characterization of the essence of notions, conditions of innovative entrepreneurship have been analysed. The emphasis has been put on the main problem concerning sustainable community development related to the contributions made to human resources and adult education, enabling innovative entrepreneurship oriented on the human ability to create and use their knowledge in constantly changing environmental conditions, responsible for work organisation satisfying current people’s social and economical needs, thought at the same time not endangering next generations.…
Further data on the presence of Fusarium emerging mycotoxins enniatins, fusaproliferin and beauvericin in cereals available on the Spanish markets.
2010
In this work, 64 samples of cereals purchased from local markets in the Valencian community (Spain) were investigated for the presence of six emerging mycotoxins: enniatins ENs (ENA, ENA1, ENB and ENB1), beauvericin (BEA) and fusaproliferin (FUS). Samples were extracted with a mixture of water/acetonitrile (85/15, v/v) by using an Ultra-turrax homogenizer. Mycotoxins were then identified and quantified with a liquid chromatography (LC) with diode array detector (DAD). Positive samples were confirmed with an LC-MS/MS. Analytical Results showed that the frequencies of contamination of samples with ENs, BEA and FUS were 73.4%, 32.8% and 7.8%, respectively. ENA1 was the most mycotoxin found and…
The Role of the Internet in Overcoming Information Barriers: Implications for Exporting SMEs of the East African Community
2012
Small and medium-sized enterprises play a significant role in the East African Community, contributing highly to the national income and employing a significant number of people. Exportation provides a great opportunity for these enterprises to expand their businesses and improve their performance. However, they encounter a number of information- related barriers before and during exportation. Based on literature, this paper identifies these barriers and discusses how the internet could be used to reduce them. Based on the internet, international business and small business literature, the paper provides propositions and develops a model that will be useful for future studies in this area.
Spatiotemporal and gender-specific parasitism in two species of gobiid fish
2018
Parasitism is considered a major selective force in natural host populations. Infections can decrease host condition and vigour, and potentially influence, for example, host population dynamics and behavior such as mate choice. We studied parasite infections of two common marine fish species, the sand goby (Pomatoschistus minutus) and the common goby (Pomatoschistus microps), in the brackish water Northern Baltic Sea. We were particularly interested in the occurrence of parasite taxa located in central sensory organs, such as eyes, potentially affecting fish behavior and mate choice. We found that both fish species harbored parasite communities dominated by taxa transmitted to fish through …