S1 Species Observed in the Experiment, Showing Percent Relative Abundances in Enclosures

S1 Species observed in the experiment, showing percent relative abundances in enclosures (Week 1 samples, pooled across all enclosures) and in the colonist pool (pooled across all dates and lakes). Note that Week 1 samples from enclosures were taken prior to colonist addition and therefore include only George Lake species. Species with zero entries in both columns occurred in enclosures later in the experiment; their source cannot be determined. The colonist pool includes species collected from the six source lakes; however, some of these taxa also occurred in George Lake. Colonist taxa that never occurred in 0 dispersal enclosures (and, therefore, that are likely new to George Lake) are in bold. Question marks preceding species names indicate tentative identifications.

% relative abundance Species enclosures colonist pool Copepoda: Cyclopoida Acanthocyclops vernalis complex (Fischer) - 0.01 Cyclops scutifer Sars - 0.03 Diacyclops thomasi (Forbes) 3.45 6.38 Mesocyclops edax (Forbes) 0.02 0.43 Tropocyclops prasinus mexicanus Kiefer - 0.28 Copepoda: Calanoida Epischura lacustris Forbes 0.00 0.23 aLeptodiaptomus ashlandi (Marsh) - 0.01 Leptodiaptomus minutus (Lilljeborg) 0.70 5.04 aLeptodiaptomus sicilis (Forbes) - 0.02 Senecella calanoides Juday - 0.03 aSkistodiaptomus oregonensis (Lilljeborg) - 0.12 aSkistodiaptomus reighardi (Marsh) - 0.01 Cladocera Bosmina s. str. sp. 0.40 1.40 Chydorus sp. - - Daphnia ambigua Scourfield 0.07 0.08 Daphnia ?dentifera Forbes 0.0004 - Daphnia ?dubia Herrick - 0.01 Daphnia longiremis Sars - 0.07 Daphnia mendotae Birge 0.02 0.34 Daphnia pulicaria Forbes - 0.04 Daphnia retrocurva Forbes - 0.11 Diaphanosoma birgei Kŏrínek 0.01 0.71 Eubosmina coregoni (Baird) - - Eubosmina longispina (Leydig) 0.04 - Eubosmina tubicen (Brehm) 0.23 0.11 Holopedium gibberum Zaddach 0.22 3.29 Leptodora kindtii (Focke) 0.0005 0.003 Polyphemus pediculus (Linnaeus) - - Sida crystallina (Müller) - 0.04 Rotifera Ascomorpha ecaudis Perty - 0.81 Ascomorpha ovalis (Bergendal) - 0.03 Asplanchna sp. - 0.37 Cephalodella sp. - - Collotheca spp. 0.30 0.72 Conochiloides sp. 0.16 0.21 Conochilus sp. 54.36 23.02 Euchlanis calpidia (Myers) - - ?Euchlanis sp. - 0.01 Gastropus stylifer Imhof 12.32 12.34 Kellicottia bostoniensis (Rousselet) 0.57 2.33 Kellicottia longispina (Kellicott) 4.48 10.55 Keratella cochlearis (Gosse) 14.29 19.68 Keratella crassa Ahlstrom 0.81 3.85 Keratella hiemalis Carlin 0.17 0.10 Keratella taurocephala Myers 5.54 3.39 Macrochaetus sp. - 0.01 Monostyla ?lunaris Ehrenberg - 0.01 Notholca ?squamula (Müller) - 0.01 Ploesoma lenticulare Herrick 0.005 0.25 Polyarthra spp. 1.83 2.50 Synchaeta sp. - 0.03 Trichocerca cylindrica (Imhof) - 0.81 Trichocerca multicrinis (Kellicott) - 0.17 aAbundances of these species may be underestimated, because immature calanoid copepodite stages were indistinguishable and were assumed to be the more common Leptodiaptomus minutus.