Data belonging to: Microplastics in Eurasian otter (Lutra lutra) spraints and their potential as a biomonitoring tool in freshwater systems James D. O’Connor¹, Heather T. Lally¹, Anne Marie Mahon¹, Ian O’Connor¹, Róisín Nash¹, John J. O’Sullivan², Michael Bruen², Linda Heerey², Albert A. Koelmans³, Ferdia Marnell⁴, Sinéad Murphy¹ ¹Marine and Freshwater Research Centre, Department of Natural Science, Galway-Mayo Institute of Technology, Dublin Road, Galway H91 T8NW, Ireland ²UCD School of Civil Engineering, UCD Earth Institute & UCD Dooge Centre for Water Resources Research, Belfield, Dublin 4, Ireland ³Aquatic Ecology and Water Quality Management Group, Department of Environmental Science, Wageningen University & Research Centre, P.O. Box 47, 6700 AA, Wageningen, Netherlands ⁴National Parks and Wildlife Service, 90 King Street North, Dublin 7, Ireland Metadata for "Spraint_Diet" Note* Occurrence = "1"; Absense = "0"; one spraint was not included in the analysis (n = 52) Column Entry Explanation A Spraint_ID Individual code assigned to each otter spraint, comprising the surveyor's initials and a unique number (in ascending order) B Vegetation Plant and detritus C Terrest. Terrestrial invertebrates D Coleop. Coleoptera (i.e. aquatic beetle) (adult and larvae) E Ephem. Ephemeroptera (i.e. mayfly larvae) F Trichop. Trichoptera (i.e. caddisfly larvae) G Gastropoda Aquatic snails H Diptera True fly larvae I Bivalvia. Bivalves (e.g. mussels) J Crustacea Amphipod and decapod crustaceans (e.g. Gammarus) K Hemip. Hemiptera (i.e. true bugs) L Adult Adult invertebrates (i.e. winged insects) M Unident. Unidentified remains (general) N Salmonid Brown trout and/or Atlantic salmon O Anguilla European eel P Cyprinid Cyprinid fish species (e.g. Eurasian minnow) Q Gastereous Three-spined stickleback R Fish_Unident. Unidentified fish remains S Amphib. Amphibians (e.g. common frog) T Other e.g. debris