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Urbanisation, urban environmental quality, national socio-economic conditions and diseases burden in Africa : a research agenda for spatio-temporal analyses of subregional characteristics
Richard Ingwe, 2013, izvirni znanstveni članek

Opis: The investigation of socio-economic, political and environmental aspects of urbanization in Africa is gaining research attention. Most recently, information on the patterns in urbanization, population growth, slumisation, among other aspects of urban Africa within the past quarter of a century or thereabout were reported. While this report elucidated on the relevant challenges, it was restricted to the regional patterns of the variables investigated. This report indicates that more information on the sub-regional aspects of these variables is required to elucidate on urban planning in the region and its sub-regions. Here, the ways forward in investigating these issues and variables underlying them are outlined. The theoretical, methodological, spatial and temporal aspects or requirements of the proposed research are discussed to provide a compass for future research.
Ključne besede: urbanization, population dynamics, Africa, sub-regions, socio-economic conditions, environment, theory, method, slumisation
Objavljeno v DKUM: 10.04.2018; Ogledov: 1411; Prenosov: 101
Celotno besedilo (301,56 KB)
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Pollinators of Helleborus niger in Slovenian naturally occuring populations
Andrej Šušek, Anton Ivančič, 2006, izvirni znanstveni članek

Opis: The study is based on documentation and analysis of the major visitors and pollinators of the Christmas rose (Helleborus niger L.) flowers in Slovenian naturally occurring populations. The emphasis was put on 5 groups of insects: bees, bumblebees, large flies, small dipterous flies and pollinators of minor importance. Systematic observations took place in March 2003, at two different locations: on the valley of Bohinjska Bela and on the Peca Mountain. The first location was not far from a rural area, while the second one was in an isolated area, completely in the wild. The analysis of insect activity showed that there were obvious differences in frequency of visits among the insect groups investigated, locations and time of day. In the population of Bohinjska Bela, bees were the most important pollinators, with the highest activity occurred between 10 a.m. and 11 a.m. In the isolated population in Peca the most frequent visitors were small dipterous flies. The study suggests that the Christmas rose is probably an entomophylous (the most important pollinators are insects, such as bees and flies) and predominantly cross-pollinating species. The entomophylous nature appears to be closely associated with the specific botanic characteristics of flowers. Another pollinating agent is probably wind.
Ključne besede: chrismas rose, helleborus niger, wild populations, pollinators, open pollination, cross pollination, population dynamics, plant population
Objavljeno v DKUM: 13.07.2017; Ogledov: 1617; Prenosov: 85
Celotno besedilo (224,24 KB)
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