Supplement 2. Data on carabid beetles and vegetation in Dutch roadside verges.

File List dataRaemakers.zip -- zip file of the next five data files from Raemakers et al. on 30 Dutch roadside verges (all comma-separated ASCII text files).<br> <br> beetles.txt -- counts of 91 beetles in the roadside verges.<br> plants.txt -- abundances of 173 plants in the roadside verges.<br> syntax_units.txt -- eight syntaxonomic units of the vegetation of the roadside verges.<br> environment.txt -- 13 variables representing soil and microclimate of the roadside verges.<br> veg_structure.txt -- nine vegetation structure variables of the roadside verges.<br> Description The file dataRaemakers.zip contains five comma-separated ASCII text files containing data from Raemakers et al. (2001) used to illustrate co-correspondence analysis in the subsection <i>Carabid beetles and vegetation in Dutch roadside verges</i>. The data form a subset of 30 roadside verges (sites). The (abbreviated) names for columns (variables) in each file are given in the first line of each file, separated by commas. Each row starts with the site name. The file beetles.txt contains counts of all 91 carabid beetles in the 30 sites. The data are ln(<i>y</i> + 1)-transformed before the analysis in the paper. The file plants.txt contains the abundances of 173 plant species on the 1-9 van der Maarel scale in the 30 sites. The file syntax_units.txt contains the eight syntaxonomic units of the 30 sites in dummy coding (indicator coding). The file environment.txt contains 13 variables representing the soil and microclimate. The variables pH, Hour_Sun, and Warmth35 are analyzed untransformed. All other environmental variables are ln-transformed, except for the variable %sandiness which is logit transformed: <i>y</i> = log(( <i>x</i> + 1)/(101 – <i>x</i>)). Full names of environmental variables: Mmoisture = Gravimetric moisture content in the first half of March.<br> ZMoisture = Gravimetric moisture content in summer.<br> %Org = Gravimetric organic matter (with respect to total dry soil including particles &gt;2 mm).<br> %Sandiness = Sand content (particles &gt;65um; including gravel and small stones) with respect to the total dry soil mass (including particles &gt;2 mm).<br> pH = pH in CaCl2<br> NO3 = NO3-N in kg/ha (CaCl2 extraction)<br> NH4 = NH4-N in kg/ha (CaCl2 extraction)<br> Nmin = N-mineral (NO3-N + NH4-N) in kg/ha<br> P = soluble P in kg/ha (CaCl2 extraction)<br> K = soluble K in kg/ha (CaCl2 extraction)<br> Nitr = nitrification degree = NO3-N / (NO3-N + NH4-N)<br> Hour Sun = hours of sunshine in June plus July as estimated from slope and exposure, and weather data<br> Warmth35 = indication of warmth as estimated from slope and exposure, assuming southwest exposed locations are warmer than southeast exposed ones<br> The file veg_structure.txt contains nine variables characterizing the vegetation structure. These nine variables are all log transformed in the analyses of the paper. Full names of vegetation structure variables: Hmax = maximum of measured average vegetation heights<br> Havg = average of the 5× measured average vegetation heights<br> Hcv = coefficient of variation of the five mean-vegetation height measurements<br> DurZero = Havg/Hmax<br> SCrMax = roughness = maximum coefficient of variation in the individual height measurements<br> MaxH = maximum height of the individual plants<br> Bio = rough measure of biomass of peak standing crop, measured from the total (absolute, not relative) covered vertical surface area<br> Hp5_50 = percentage of the vegetation height (with exceedings threshold 5%) below which 50% of the biomass occurs<br> Vul5 = convexity of the graph of vegetation density against vegetation height (with exceedings threshold 5%)<br> <br> The first five variables are from height measurements with the ring method (5× per year). The last four variables are from vertical structure photographs (on moment of Peak Standing Crop). Literature cited Raemakers, I. P., A. P. Schaffers, K. V. Sýkora, and T. Heijerman. 2001. The importance of plant communities in road verges as habitat for insects. Proceedings of the Section Experimental and Applied Entomology of the Netherlands Entomological Society <b>12</b>:101–106.