Stream diatom worldwide dataset and environmental data

This dataset include the data used in the paper entitle "Stream diatom biodiversity in islands and continents – a global perspective on the effects of area, isolation and the environment" published in 2022 in Journal of Biogeography. This dataset is a RData format which include 2 objects: 'comm_tot' and 'env'. 'comm_tot'includes presence-absence of diatom species (Omnidia code) of 5446 sites from 18 islands (Co: Corsica, Cy: Cyprus, Gu: Guadeloupe, Ic: Iceland, Ir: Ireland, Ka: Kauai, Re: La Réunion, Ma: Martinique, Md: Madeira, Mj: Majorca, My: Mayotte, Nc: New Caledonia, Nz: North New Zealand, Oa: Oahu, Po: Possession, Sm: São Miguel, Sa: Sardinia and Sz: South New Zealand) and six continental areas (Ch: China, Fi: Finland, Fr: France, Gy: French Guiana, Ke: Kenya and Us: USA). 'env' includes environmental data associated with each sampling station, including geographical coordinates ('x' and 'y'), pH, conductivity ('cond' in uS/cm), total phosphorus ('tp' in mg/l), total nitrogen ('tn' in mg/l), orthophosphates ('po4' in mg/l), water temperature (wat_temp in °C), bioclimatic data from WorldClim database at 0.5 minutes resolution ('ann_prec': annual precipitation (mm), 'prec_sea': seasonality in precipitation (%), 'ann_temp': annual temperature (°C), and 'sea_temp': temperature seasonality), altitude ('alti' in meters) and slope. The data from Mayotte island reported in this dataset comes from Rimet, F., Tapolczai, K., Vasselon, V., Mary, N. Bouchez, A. (2019) Mayotte rivers: databases used for the development of diatom and macroinvertebrates water quality tools. https://doi.org/10.15454/6Z5IAH