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@article{928657, author = {Michalcová, Dana and Chytrý, Milan and Lvončík, Samuel and Hájek, Ondřej}, article_number = {2}, keywords = {Alpha diversity; Beta diversity; Endangered species; Invasive species; Neophytes; Ordination; Parameter estimation; Relevé; Sample-based rarefaction; Species number; Stratification; Subjectivity}, language = {eng}, issn = {1100-9233}, journal = {Journal of Vegetation Science}, title = {Bias in vegetation databases? A comparison of stratified-random and preferential sampling}, url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1654-1103.2010.01249.x/abstract}, volume = {22}, year = {2011} }
TY - JOUR ID - 928657 AU - Michalcová, Dana - Chytrý, Milan - Lvončík, Samuel - Hájek, Ondřej PY - 2011 TI - Bias in vegetation databases? A comparison of stratified-random and preferential sampling JF - Journal of Vegetation Science VL - 22 IS - 2 SP - 281-291 EP - 281-291 PB - Wiley-Blackwell SN - 11009233 KW - Alpha diversity KW - Beta diversity KW - Endangered species KW - Invasive species KW - Neophytes KW - Ordination KW - Parameter estimation KW - Relevé KW - Sample-based rarefaction KW - Species number KW - Stratification KW - Subjectivity UR - http://onlinelibrary.wiley.com/doi/10.1111/j.1654-1103.2010.01249.x/abstract N2 - Aim: Vegetation plots collected since the early 20th century and stored in large vegetation databases are an important source of ecological information. These databases are used for analyses of vegetation diversity and estimation of vegetation parameters, however such analyses can be biased due to preferential sampling of the original data. In contrast, modern vegetation survey increasingly uses stratified-random instead of preferential sampling. To explore how these two sampling schemes affect vegetation analyses, we compare parameters of vegetation diversity based on preferentially sampled plots from a large vegetation database with those based on stratified-random sampling. Location: Moravian Karst and Silesia, Czech Republic. Methods: We compared two parallel analyses of forest vegetation, one based on preferentially sampled plots taken from a national vegetation database and the other on plots sampled in the field according to a stratified-random design. We repeated this comparison for two different regions in the Czech Republic. We focussed on vegetation properties commonly analysed using data from large vegetation databases, including alpha (within-plot) diversity, cover and participation of different species groups, such as endangered and alien species within plots, total species richness of data sets, beta diversity and ordination patterns. Results: The preferentially sampled data sets obtained from the database contained more endangered species and had higher beta diversity, whereas estimates of alpha diversity and representation of alien species were not consistently different between preferentially and stratified-randomly sampled data sets. In ordinations, plots from the preferential samples tended to be more common at margins of plot scatters. Conclusions: Vegetation data stored in large databases are influenced by researcher subjectivity in plot positioning, but we demonstrated that not all of their properties necessarily differ from data sets obtained by stratified-random sampling. This indicates the value of vegetation databases for use in biodiversity studies; however, some analyses based on these databases are clearly biased and their results must be interpreted with caution. ER -
MICHALCOVÁ, Dana, Milan CHYTRÝ, Samuel LVONČÍK a Ondřej HÁJEK. Bias in vegetation databases? A comparison of stratified-random and preferential sampling. \textit{Journal of Vegetation Science}. Wiley-Blackwell, 2011, roč.~22, č.~2, s.~281-291. ISSN~1100-9233.
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