Supplementary information for sediment, soil, and surface water data at Ashfield Flats Reserve, Western Australia

Published: 9 February 2022| Version 1 | DOI: 10.17632/sz7rwg5p4n.1
Contributors:
Andrew Rate,

Description

The data presented are dependent on two pre-existing Mendeley Data datasets: Rate, Andrew; McGrath, Gavan (2022), “Sediment and soil quality at Ashfield Flats Reserve, Western Australia”, Mendeley Data, V1, doi: 10.17632/d7m3746byk.1 https://data.mendeley.com/datasets/d7m3746byk/1 Rate, Andrew; McGrath, Gavan (2022), “Surface water quality at Ashfield Flats Reserve, Western Australia”, Mendeley Data, V1, doi: 10.17632/vphzgjshgm.1 https://data.mendeley.com/datasets/vphzgjshgm/1 Elemental (including Al, As, B, Ba, Be, Ca, Cd, Ce, Co, Cr, Cu, Fe, Ga, Gd, Ge, K, La, Mg, Mn, Mo, Na, Nb, Nd, Ni, P, Pb, S, Sc, Si, Sr, Th, Ti, V, Y, Zn, Zr) concentrations, pH, electrical conductivity, microplastics, Longitude-Latitude and UTM Zone 50 coordinates, sample material type, sampling strata, and sample identification codes for 231 samples of sediment or soil, and elemental (including Al, As, B, Ba, Ca, Co, Cr, Cu, Fe,Gd, K, La, Mg, Mn, Mo, Na, Nd, Ni, P, S, Si, Sr, V, Zn) concentrations, selected nutrient ion concentrations (nitrate+nitrite (NOx), filterable reactive phosphate (FRP)), pH, electrical conductivity, Longitude-Latitude and UTM Zone 50 coordinates, sampling strata, and sample identification codes for 172 samples of surface water. Samples were collected in 2019, 2020, and 2021 from Ashfield Flats Reserve, an urban nature reserve in Western Australia. The objective of the supplementary data is to analyse the statistical distributions of measured variables, and assess whether these variables (or log10- or Box-Cox-power-transformed variables) are normally distributed, and whether the distributions are unimodal. Maps are presented to contextualize the data spatially and visually. The distribution statistics are a guide to which subsequent statistical analyses (e.g. parametric or non-parametric) should be used. This supplementary data includes: » Map images showing location of the study site and location of samples; » A table of lower limits of detection for analyses; » 3 Tables of distribution statistics (Shapiro-Wilk, Hartigan Dip-test) for raw and transformed numeric variables in sediment/soil data by sampling year (2019, 2020, 2021) » A figure showing density distribution plots for chemical water quality parameters. » 3 Tables of distribution statistics (Shapiro-Wilk, Hartigan Dip-test) for raw and transformed numeric variables in surface water data by sampling year (2019, 2020, 2021)

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Steps to reproduce

All exploratory data analyses were performed in R (R Core Team, 2020) using the ‘car’ package (Fox and Weisberg, 2019) for power transformation, the ‘diptest’ R package (Maechler, 2021) for multimodality tests, the “RcmdrMisc’ package (Fox, 2020) for tables, ‘DataExplorer’ (Cui, 2020) for distribution plots, and the ‘sp’, ‘OpenStreetMap’ and ‘prettymapr’ packages (Dunnington, 2017; Fellows, 2019; Pebesma and Bivand, 2020) for preparing maps. Variables in yearly subsets of the dataset were checked for normal distributions using Shapiro-Wilk tests, and transformed using log10, or power transformations using the Box-Cox method to estimate the power term. Multimodality of distributions was assessed using Hartigan’s dip statistic. References Cui, B., 2020. DataExplorer: Automate Data Exploration and Treatment. R package version 0.8.2. https://CRAN.R-project.org/package=DataExplorer (accessed 2021-10-10). Dunnington, D., 2017. prettymapr: Scale Bar, North Arrow, and Pretty Margins in R. R package version 0.2.2 https://CRAN.R-project.org/package=prettymapr (accessed 2021-11-18). Fellows, I., 2019. OpenStreetMap: Access to open street map raster images, using the JMapViewer library by Jan Peter Stotz. . (R Package Version 0.3.4) http://CRAN.R-project.org/package=OpenStreetMap http://www.fellstat.com http://blog.fellstat.com/?cat=15 (accessed 2021-06-16). Fox, J., 2020. RcmdrMisc: R Commander Miscellaneous Functions. R package version 2.7-1. https://CRAN.R-project.org/package=RcmdrMisc (accessed 2021-12-03). Fox, J., Weisberg, S., 2019. An {R} Companion to Applied Regression, Third Edition. Sage, Thousand Oaks, CA, USA https://socialsciences.mcmaster.ca/jfox/Books/Companion/ (accessed 2022-02-09). Maechler, M., 2021. diptest: Hartigan's Dip Test Statistic for Unimodality - Corrected. R package version 0.76-0 https://CRAN.R-project.org/package=diptest (accessed 2021-11-19). Pebesma, E., Bivand, R., 2020. sp: Classes and Methods for Spatial Data. R package version 1.4-4. https://CRAN.R-project.org/package=sp (accessed 2021-06-24). R Core Team, 2020. R: A language and environment for statistical computing (Version 4.0.3). R Foundation for Statistical Computing, Vienna, Austria, https://www.R-project.org (accessed 2022-02-09).

Institutions

University of Western Australia

Categories

Environmental Science, Surface Water, Surface Water Pollution, Soil Quality, Environmental Assessment, Stormwater, Sediment Quality

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