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:6f8b326e-d1f0-413e-b8ac-472b83c7de5e
dcterms:title "Diatom taxon abundances at river sites in the Cordillera Blanca region of the Peruvian Andes, 2020" ;
dcterms:identifier "https://catalogue.ceh.ac.uk/id/6f8b326e-d1f0-413e-b8ac-472b83c7de5e","https://doi.org/10.5285/6f8b326e-d1f0-413e-b8ac-472b83c7de5e" ;
dcterms:bibliographicCitation "Kerr, N., Fell, S.C., Kelly, M., Brown, L.E. (2025). Diatom taxon abundances at river sites in the Cordillera Blanca region of the Peruvian Andes, 2020. NERC EDS Environmental Information Data Centre. https://doi.org/10.5285/6f8b326e-d1f0-413e-b8ac-472b83c7de5e" ;
dcterms:description "This dataset provides diatom taxon abundance data from 11 rivers in the Cordillera Blanca region of the Peruvian Andes. Benthic diatoms were collected from a 9 cm2 surface on five submerged cobbles at each river site. Diatoms were identified and abundances determined using microscopy methods in the laboratory from each replicate, then averaged across the five replicates for each site. Data were collected from 7/05/2020 to 16/05/2020." ;
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rdfs:label "At each site, benthic diatoms were collected from five submerged cobbles. Using a sterile toothbrush, the benthic biofilm on the upper surface of each cobble was scrubbed from a 9 cm2 area using a miniature quadrat. Organic material was removed using the hot hydrogen peroxide (H2O2) method and replicate samples mounted on individual slides. Diatom valves were identified and counted using light microscopy at x 1000 magnification using phase-contrast illumination (Olympus CX43 microscope). A minimum of 500 diatom valves were identified from each replicate. Where less than 500 valves were present, all valves were counted. To determine estimates of valve density, the number of valves identified within coverslip transects was used to estimate the total number present on the whole coverslip (0.5 mL) and then multiplied to m-2 based on sample volume and rock area (9 cm2) sampled. Abundances were then averaged across the five replicates to mean diatom density (valve m-2) at each site."
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