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Oikos OIK-01700 Henriksson, A., Yu, J., Wardle, D. A. and Englund, G. 2014. Biotic resistance in freshwater fish communities: species richness, saturation or species identity? – Oikos doi: 10.1111/oik.01700 Appendix 1 Figure A1. The studied area showing the distribution of failed and successful introductions of Arctic char included in the study. Table A1. Species present in fewer than 30 lakes of the studied lakes which are included in the variable ”other”, a binary variable in the saturation model. Either none of the species were present (0) or one or more were present (1). Common name Latin name Alpine bullhead Cottus poecilopus Asp Aspius aspius Brook trout Salvelinus fontinalis Carp Cyprinus carpio Chub Squalius cephalus Common dace Leuciscus leuciscus Crucian carp Carassius carassius European minnow Phoxinus phoxinus European smelt Osmerus eperlanus Fourhorn sculpin Triglopsis quadricornis Grayling Thymallus thymallus Ide Leuciscus idus Ninespined stickleback Pungitius pungitius Rainbow trout Oncorhynchus mykiss/ Salmo gairdneri Rudd Scardinius erythrophthalmus Salmon Salmo salar Spined loach Cobitis taenia Splake Salvelinus namaycush x Salvelinus fontinalis Tench Tinca tinca Threespined stickleback Gasterosteus aculeatus Vimba Abramis vimba Wels Silurus glanis White bream Abramis bjoerkna, Blicca bjoerkna Zander Sander lucioperca Zope Abramis ballerus Appendix 2 d =2 Forest Degree day Maxtemp Other species .0 Whitefish .0 Burbot .0 Brown trout .0 Vendace .0 Ruffe.0 Perch.1 Eel .0 Pike .0 Agriculture Tench .0 Bream.0 Roach .0 Roach.1 Wetland Pike.1 Bream.1 Prop.lake Eel.1 Richness Burbot .1 Urban Other species .1 Perch .0 Ruffe.1 Brown trout .1 Vendace .1 Saturation Logarea Whitefish .1 Tench.1 Otherland Figure A2. An ordination of quantitative variables and factors used for predicting the introduction success of Arctic char, using the dudi.mix function in the ade4 package in R, for the two primary axes (d = 2). Ambiguous records of species presence/absence, which were given the value 0.5 in the main dataset (n = 14), were not included in the figure to enhance clarity. The .0 and .1 after each species separates presence from absence (.0 = absent, .1 = present). The first and second axes explain 38% and 9% of the total variance respectively. .

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