Migration research is an emerging field in the Czech Republic and data collection poses many methodological challenges. Some of the problems are universal for the research of other hard-to-reach populations. Other problems are, on the contrary, unique, applying only for the research of immigrants and could be country specific. This article focusses mainly on the quantitative research of immigrants where the issue of sampling problem is of major concern. The aim of the article is to address the issue of sampling immigrants in the context of the Czech Republic. In the first part of the article, there is a review of existing methodological approaches to researching immigrant populations. The focus here is on potential problems when applying particular methods in the Czech context. The second part of the article is dedicated to a review of four major Czech sample surveys of immigrants that are compared in terms of their methodology and basic results., Josef Bernard, Yana Leontiyeva., and Obsahuje bibliografii
Migration research is an emerging field in the Czech Republic and data collection poses many methodological challenges. Some of the problems are universal for the research of other hard-to-reach populations. Other problems are, on the contrary, unique, applying only for the research of immigrants and could be country specific. This article focusses mainly on the quantitative research of immigrants where the issue of sampling problem is of major concern. The aim of the article is to address the issue of sampling immigrants in the context of the Czech Republic. In the first part of the article, there is a review of existing methodological approaches to researching immigrant populations. The focus here is on potential problems when applying particular methods in the Czech context. The second part of the article is dedicated to a review of four major Czech sample surveys of immigrants that are compared in terms of their methodology and basic results
The outcome of assessments of the biodiversity of a taxonomic group often depend on the sampling method. The choice of an adequate method is especially important for biomonitoring purposes. In this study, the effectiveness of two methods of sampling syrphids (Diptera: Syrphidae) is compared: observation plot method vs. line transect, both sampled by sweep netting. Altogether, 18 meadows were selected in three mountain regions in the Austrian and Swiss Alps. We recorded a significantly higher abundance and richness of syrphids using the observation plot method than the line transect method in 2015. Comparing data for one region recorded in 2015 and 2016, similar results were obtained. Syrphid species assemblages were affected by sampling method in both years. More syrphid species and individuals were recorded using the observation plot method, which makes it more suitable for studies aiming at comparing differences in the numbers of adult syrphids in different grassland habitats., Raja I. Hussain, Ronnie Walcher, David Brandl, Arne Arnberger, Johann G. Zaller, Thomas Frank., and Obsahuje bibliografii