Supplementary Table 1. Mean Ant Densities and Impact Scores (For Non-Rare Species) at The

Supplementary Table 1. Mean ant densities and impact scores (for non-rare species) at the five study sites.

Siteant speciesmean density (s.d.)mean impact score (s.d.)

AhumoaPheidole megacephala817.6 (317.9)0.027 (1.203)

PohakuloaLinepithema humile191.8 (231.5)-0.040 (0.882)

HuluhuluLinepithema humile364.6 (202.6)-0.200 (0.879)

KalahakuLinepithema humile1113.4 (1323.0)-0.182 (0.919)

Puu O IliLinepithema humile1290.6 (2106.0)0.520 (2.813)

Supplementary Table 2. All non-rare arthropod species captured that could be identified as either endemic or introduced to the Hawaiian Islands.

Mean Mean Mean

Troph. uninv. inv. impact

Taxon Prov.a roleb dens.c dens.d scoreeSitesfDet.g

Order Araneae

Family Dysderidae

Dysdera crocataint carn50-1.00hkoPDK

Family Gnaphosidae

Urozelotes rusticus int carn53.5 113.51.16apPDK

Zelotes reformans int carn 17 5-0.71ahpPDK

Family Linyphiidae

Cnephalocotes simplicicepsend carn 1522-0.99pPDK

Ostearius melanopygius int carn 5.52.5-0.57akoJB

Tenuiphantes tenuis int carn 1214-0.03akopJB

Family Lycosidae

Lycosa sp. end carn 247-0.81ahkoVF

Family Miturgidae

Cheiracanthium mordax int carn 39.732.3-0.23ahopPDK

Family Philodromidae

Pagiopalus atomarius end carn 5.70.3-0.93kopPDK

Family Salticidae

Habronattus tarsalis int carn 8.5 11.50.42ahkopJB

Family Theridiidae

Achaearanea acoreensis int carn 87-0.13oJB

Achaearanea cf. riparia int carn 127 24-0.32ahopJB

Steatoda grossa int carn 15 9-0.40ahkoJB

Theridion mauiense end carn 212-0.90oPDK

Family Thomisidae

Misumenops kanakanus end carn 630-1.00oJG

Order Cambalida

Family Cambalidae

?Nannolene sp. end detr 61-0.83kRS

Order Coleoptera

Family Carabidae

Blackburnia lenta endcarn90-1.00koJKL

Laemostenus complanatus intcarn356-0.83pPDK

Mecyclothorax cordithoraxendcarn80-1.00oJKL

Trechus obtusus intcarn15150.00koJKL

Family Curculionidae

Oodemassp. endherb60-1.00koPDK

Pantomorus cervinus intherb34811.21ahopPDK

Family Staphylinidae

?Atheta sp. 1 intcarn91-0.89ahoPDK

Family Tenebrionidae

Gonocephalum bilineatum intdetr690.50aGAS

Order Collembola

Family Entomobryidae

Entomobrya kea enddetr40.516.5-0.40hkopKC

Entomobrya multifasciata intdetr216.8 310.60.68ahkopPDK

Entomobrya unostrigata intdetr2373230.36apKC

Pseudosinella octopunctataintdetr56.5132.51.24hkoPDK

Seira lelo enddetr109 1190.09hPDK

Supplementary Table 2 continued

Mean Mean Mean

Troph. uninv. inv. impact

Taxon Prov. role dens. dens. scoreSitesDet.

Family Hypogastruridae

Brachystomella momona enddetr9149-0.46hKC

Friesea ninau enddetr94-0.56hPDK

Hypogastrura boletivora intdetr150-1.00apPDK

Xenylla auka enddetr4145.789460.12ahkopPDK

Family Isotomidae

Anurophorus lohi enddetr2240-1.00hkoPDK

Cryptopygus benhami intdetr275-0.81oKC

Cryptopygus thermophilus intdetr399.510930.40hopPDK

Folsomides angularis intdetr20443.5-0.60apAF

Isotoma notabilis intdetr8 221.75hoKC

Isotoma trispinata int detr 106 -0.40hPDK

Proisotoma minuta int detr 143-0.79hKC

Family Onychiuridae

Tullbergia macrochaeta int detr 679.5-0.46hopPDK

Family Sminthuridae

Bourletiella insula end detr 1300 126 -0.90ahpPDK

Sminthurides biniserratusintdetr4227-0.36apPDK

Order Diptera

Family Anthomyiidae

Delia platura int herb 20.7517.25-0.27ahkopPDK

Family Calliphoridae

Dyscritomyia sp. enddetr10120.20hkPDK

Eucalliphora latifrons int detr 1610.7-0.45hkopPDK

Pollenia rudis int detr 113-0.73hopPDK

Family Dolichopodidae

Campsicnemus n. sp. end carn 10.57-0.03koNE

Diaphorus parthenus endcarn70-1.00hPDK

Family Drosophilidae

Scaptomyza pallida intdetr238-0.65pPDK

Family Phoridae

Megaseliasp. enddetr339.6-0.59ahkopPDK

Family Sarcophagidae

Helicobia morionella intdetr12.53-0.66ahopPDK

Ravinia anxia intdetr10170.70hkPDK

Family Sciaridae

Bradysiasetigera end detr 7222.14hPV

Order Hemiptera

Family Anthocoridae

Orius persequens int carn 118-0.27apPDK

Family Aphididae

Aphis gossypii int herb 170-1.00hMT

Brachycaudus helichrysi int herb 9110.22kMT

Ericaphis fimbriata int herb 161.5256.50.41koMT

Hayhurstia atriplicis int herb210-1.00apMT

Illinoia azaleae int herb17.768.72.76hkoMT

Sitobion fragariae int herb25320.28koMT

Family Cicadellidae

Cicadellidae sp. b int herb63-0.50aPDK

Nesophrosyne giffardi end herb19270.42pDAP

Supplementary Table 2 continued

Mean Mean Mean

Troph. uninv. inv. impact

Taxon Prov. role dens. dens. scoreSitesDet.

Family Delphacidae

Aloha myoporicola end herb 641631.55pPDK

Nesosydne nigrinervis end herb731631.17koPDK

Nesosydne osborni endherb88.5126-0.03koPDK

Nesosydne raillardiicolaend herb 122177.50.76koPDK

Nesosydne raillardiae end herb1184072.45aPDK

Family Lygaeidae

Neacoryphus bicrucis int herb19441.32aPDK

Nysius abnormis end herb260-1.00oDAP

Nysius beardsleyi end herb 62-0.67oDAP

Nysius coenosulus endherb15160.07kpDAP

Nysius communis end herb 17.514.5-0.13koDAP

Nysius kinbergi endherb90-1.00koDAP

Nysius lichenicola endherb234.7-0.86hkoDAP

Nysius palor int herb 24171.5-0.62akpDAP

Nysius rubescens end herb 13 3-0.73hoDAP

Nysius terrestris end herb462180.5-0.73akopDAP

Family Miridae

Coridromius variegatus int herb67810.21pDAP

Engytatus hawaiiensis endherb235390.67koPDK

Opuna n. sp. a end herb520.5-0.99koDAP

Opuna n. sp. b end herb60-1.00aopDAP

Orthotylus sophorae end herb 8532-0.62pDAP

Orthotylus sophoroides endherb147119-0.19koDAP

Sarona haleakala endherb83-0.63oPDK

Sarona myoporicola end herb3911-0.72pDAP

Taylorilygus apicalis int herb7130.89apDAP

Family Pentatomidae

Nezara viridula int herb60-1.00apPDK

Family Psyllidae

Acizzia uncatoides int herb 6110.83koPDK

Family Rhyparochromidae

Brentiscerus australis int herb64-0.37ahopDAP

Order Hymenoptera

Family Formicidae

Cardiocondyla kagutsuchi int omni391-0.97ahpBS&JH

Order Isopoda

Family Porcellionidae

Porcellio laevis int detr136-0.54apPDK

Porcellio scaber int detr1302542.79hkoPDK

Order Julida

Family Julidae

Cylindroiulus sp. int detr 56 730.24hkopRS

Order Lepidoptera

Family Cosmopterigidae

Hyposmocoma sp. a end herb50-1.00apPDK

Hyposmocoma sp. c end herb70-1.00aPDK

Hyposmocoma sp. e end herb 85-0.38kDP

Family Crambidae

Eudoniasp. endherb195-0.74kDP

Supplementary Table 2 continued

Mean Mean Mean

Troph. uninv. inv. impact

Taxon Prov. role dens. dens. scoreSitesDet.

?Mestolobessp. end herb 113-0.73hoDP

?Orthomecynasp. end herb 156-0.60akoDP

Family Oecophoridae

Thyrocopa apatela end herb 81-0.88koPDK

Order Lithobiomorpha

Family Henicopidae

Lamyctes africana int carn138.5-0.50ahopGE

Lamyctes emarginatus int carn18.76.7-0.67ahkopGE

Order Neuroptera

Family Chrysopidae

Chrysoperla comanche int carn 680.33pCT

Order Psocoptera

Family Ectopsocidae

Ectopsocus californicus int detr41.7882.60ahkopEM

Ectopsocus vachoni int detr104.5256.84.20ahkopEM

Family Elipsocidae

Kilauella sp. 1 end detr 145126.5-0.15apEM

Kilauella sp. 2 end detr 571301.28aEM

Kilauella sp. 3 end detr 60-1.00aEM

Kilauella sp. 4 end detr 3512-0.66pEM

Kilauella sp. 5 end detr 80-1.00aopEM

Kilauella sp. 6 end detr 92-0.78hEM

Kilauella sp. 7 end detr132-0.85apEM

Kilauella sp. 9 end detr 211908.05opEM

Propsocus pulchripennis intdetr38.52.5-0.84ahkpEM

Family Pseudocaeciliidae

Austropsocussp. int detr92-0.78pEM

Family Psocidae

Ptycta distinguenda end detr 40260.37aopEM

Ptycta maculifrons end detr 80-1.00aEM

Family Trogiidae

Cerobasis guestfalica int detr45.7135.31.05aopEM

Lepinotus reticulatus int detr 138.5152-0.30aopEM

Order Thysanoptera

Family Phlaeothripidae

Apterygothrips remotus end detr91-0.89kSN

Haplothrips davisi end detr 73.582.5-0.36ahkopSN

Family Thripidae

Aptinothrips rufus int herb101-0.90aopSN

Frankliniella occidentalisint herb 8292.63aopSN

Neurisothrips multispinus end herb 303.33010.05hkoSN

Tenothrips frici int herb62-0.67oSN

Thrips hawaiiensis int herb 550.00oSN

aProvenance: end = endemic, int = introduced

bTrophic role: carn = carnivore, herb = herbivore, detr = detritivore, omni = omnivore

cThe mean density in uninvaded plots, calculated only among sites that yielded at least 5 total indivduals in uninvaded plots

dThe mean density in invaded plots, calculated only among sites that yielded at least 5 total individuals in uninvaded plots

eCalculated as the mean of impact scores among sites, not calculated from the mean invaded and uninvaded densities.

fAll study sites at which the species was collected, including sites that yielded fewer than 5 total individuals in uninvaded plots (although abundance data from these latter sites were not used in density and impact calculations, and were not included in analyses); a = Ahumoa, h = Huluhulu, k = Kalahaku, o = Puu O Ili, p = Pohakuloa

gSpecies determinations: JB = J. Beatty, KC = K. Christiansen, GE = G. Edgecombe, NE = N. Evenhuis, AF = A. Fjellberg, VF = V. Framenau, JG = J. Garb, JH = J. Heinze, PDK = P. Krushelnycky, JKL = J.K. Liebherr, EM = E. Mockford, SN = S. Nakahara, DAP = D.A. Polhemus, DP = D. Pollock, GAS = G.A. Samuelson, BS = B. Seifert, RS = R. Shelley, CT = C. Tauber, MT = M. Tremblay, PV = P. Vilkamaa.

Supplementary Table 3. All rare arthropod species captured that could be identified as either endemic or introduced to the Hawaiian Islands.

Mean Mean

Troph. uninv. inv.

Taxon Prov.a roleb dens.c dens.d AbsenteSitesfDet.g

Order Araneae

Family Agelenidae

Hololena curtaintcarn10.5noapPDK

Tegenaria domesticaintcarn0.51noapPDK

Family Corinnidae

Meriola arciferaintcarn39noaopJB

Family Desidae

Badumna longinquaintcarn11noaPDK

Family Dictynidae

Dictyna calcarataintcarn10yespPDK

Family Linyphiidae

Erigone autumnalisintcarn0.70.7noahkJM

Erigone bifurcaintcarn01nohJM

Family Salticidae

Havaikasp. end carn 0 1nopPDK

Family Theridiidae

Steatoda capensisintcarn34noaSH

Theridion melanostictumint carn25nooPDK

Family Thomisidae

Misumenopssp. aendcarn10yesoJG

Misumenopssp. b end carn20yeskoJG

Order Coleoptera

Family Aglycyderidae

Proterhinus sp. end herb40yeskPDK

Family Anobiidae

Holcobius granulatus end detr 10yespGAS

Ozognathussp.intdetr14nopPDK

Family Apionidae

Exapion ulicisintherb11nooBK

Family Carabidae

Blackburnia rupicola end carn 10yeskJKL

Mecyclothorax apicalis endcarn20yesoJKL

Mecyclothorax montivagusendcarn10yesoJKL

Mecyclothoraxn. sp. end carn 10yeshJKL

“montivagus”H

Mecyclothorax peleendcarn10yeshJKL

Mecyclothorax rusticusendcarn10yeskJKL

Family Cerambycidae

Plagithmysus lookiend herb01nopPDK

Plagithmysus ?swezeyanus end herb10yeskPDK

Family Chrysomelidae

Altica carinataintherb01nokPDK

Diachus auratusintherb0.51.5noapPDK

Family Coccinellidae

Coccinella septempunctataintcarn0.5 1noaoPDK

Cryptolaemus montrouzieriintcarn1 2.5noapPDK

Diomus debilisintcarn12nopPDK

Diomus notescensintcarn02nokPDK

Diomus sp. intcarn2.24.2noahkpPDK

Supplementary Table 3 continued

Mean Mean

Troph. uninv. inv.

Taxon Prov. role dens. dens. AbsentSitesDet.

Hippodamia convergens int carn 1.72.3noakoPDK

Hyperaspis fimbriolataint carn 11noaPDK

Olla v-nigrum int carn2.50yeskoPDK

Rhyzobius forestieriintcarn01nopPDK

Rhyzobius lophanthaeintcarn0.55.5noaoPDK

Scymnus horniint carn 01nopPDK

Scymnus loewiiintcarn22.3noaopPDK

Scymnus varipesintcarn10yesaPDK

Family Curculionidae

Otiorhynchus cribricollisintherb01nopPDK

Tychius picirostrisintherb01nooGAS

Family Dermestidae

Dermestes frischiintdetr01.5noakGAS

Labrocerus obscurusenddetr40yespPDK

Family Elateridae

Conoderus exsulintcarn21nohPDK

Family Latridiidae

Aridius nodiferintdetr40yesoGAS

Latridiidaesp. a intdetr31.5noapGAS

Family Mycetophagidae

Litargus balteatusintdetr0.50.5nokoPDK

Typhaea stercoreaintdetr10.5nokoPDK

Family Nitidulidae

Carpophilus dimidiatusintdetr01noaPDK

Carpophilus hemipterusintdetr11nooCPE

Carpophilus humeralisintdetr22nooCPE

Family Staphylinidae

Aleocharasp.intcarn20yespASR

?Athetasp. 2intcarn30yesoPDK

?Atheta sp. 3intcarn31nohPDK

?Atheta sp. 4intcarn08nopPDK

?Atheta sp. 5intcarn0.70.7noahpPDK

Hypocyphtini sp.intcarn10yeskPDK

Tachyporussp. 1intcarn01nokASR

Family Tenebrionidae

Blapstinus dilatatusintdetr02nopGAS

Order Collembola

Family Hypogastruridae

Anurida aninienddetr1 0yeshKC

Neanura muscorumintdetr26nooPDK

Order Dermaptera

Family Forficulidae

Forficula auriculariaintomni1.5 0yeskoPDK

Order Diptera

Family Cecidomyiidae

Lestremia sp. bendunk3 0yeshPDK

Trisopsis oleae intcarn10yespPDK

Family Chironomidae

Orthocladius davisienddetr10yeshKM

Orthocladiusn. sp.enddetr01nokKM

Supplementary Table 3 continued

Mean Mean

Troph. uninv. inv.

Taxon Prov. role dens. dens. AbsentSitesDet.

Family Dolichopodidae

Campsicnemus maculaendcarn1.50yeshoPDK

Family Drosophilidae

Drosophilasp. a intdetr03nohPDK

Scaptomyza cuspidataenddetr01nooPDK

Family Lonchaeidae

Silbasp.intherb20yespIM

Family Muscidae

Brontaea quadristigma intdetr10yespPDK

Coenosia humilisintcarn01noaAP

Family Mycetophilidae

Leiasp. aenddetr01nooKA

Family Phoridae

Puliciphora?luciferaintdetr20yeshPDK

Family Sarcophagidae

Blaesoxipha plinthopyga int detr12nohkopPDK

Ravinia anandraintdetr44nohPDK

Family Scatopsidae

Coboldia fuscipesintdetr10yeskPDK

Family Sciaridae

Bradysia sp. nr. impatiens intdetr2.32.3noakpPV

Bradysia triticiintdetr0.50.5nokpPDK

Ctenosciara hawaiiensisenddetr44nohPV

Hyperlasion magnisensoriaenddetr0.50.5nohoPDK

Family Sepsidae

Sepsis thoracicaintdetr0 2nokPDK

Family Sphaeroceridae

Pullimosina pullulaintdetr10yespSM

Trachyopella nudaintdetr10yespSM

Family Tachinidae

Gonia longipulvilliintcarn0.50.5nohkPDK

Family Tephritidae

Trupanea crassipesendherb2 1noaPDK

Trupanea limpidapexendherb01nokPDK

Family Tipulidae

Limoniasp. aenddetr10yeshPDK

Order Hemiptera

Family Anthocoridae

Alofa sodalisintcarn37nopPDK

Family Aphididae

Aphididaesp. 1intherb01nooPDK

Aulacorthum solani intherb01nooMT

Macrosiphum euphorbiaeintherb1.32.3noahoMT

Myzus persicaeintherb10yesaMT

Rhopalosiphoninus latysiphonintherb41nohMT

Tetraneura nigriabdominalisintherb01noaMT

Therioaphis trifoliiintherb01noaMT

Family Cercopidae

Clastoptera xanthocephalaintherb0.51.5nokoPDK

Supplementary Table 3 continued

Mean Mean

Troph. uninv. inv.

Taxon Prov. role dens. dens. AbsentSitesDet.

Family Cicadellidae

Cicadellidaesp. aintherb11nooDAP

Nesolina lineataendherb15noaPDK

Nesophrosyne haleakalaendherb 2.54nokoPDK

Nesophrosyne nuenueendherb35noaPDK

Planiocephalus flavicosta intherb10yeskPDK

Scaphytopius loricatusintherb01nopPDK

Family Delphacidae

Emoloana eragrosticolaend herb17noaPDK

Nesosydne coprosmicola end herb10yeshPDK

Family Lygaeidae

Geocoris pallensintcarn07.5noakPDK

Myodochinisp.intherb10yespDAP

Nesius ochriasis baldwiniendherb40yesoPDK

Nesomartis psammophilaendherb12noaDAP

Family Margarodidae

Icerya purchasiintherb10yespPDK

Family Miridae

Koanoa hawaiiensisendcarn10yespDAP

Opunan. sp. cend herb10yesoDAP

Rhinacloa forticornisintherb1.50.5noapDAP

Family Nabidae

Nabisn.sp. "deceptor”endcarn20yespDAP

Nabis kahavaluendcarn20yespDAP

Nabisn. sp. "siban"end carn10yesoDAP

Nabissp. end carn10yeskDAP

Family Psyllidae

Glycaspis brimblecombei intherb01nooPDK

Family Reduviidae

Empicoris rubromaculatusintcarn12noaopPDK

Family Scutelleridae

Coleotichus blackburniaeend herb01nopPDK

Order Hymenoptera

Family Apidae

Apis melliferaintherb10yeskPDK

Family Colletidae

Hylaeus difficilisend herb01nohKM

Hylaeus nivicolaendherb10yeskKM

Family Formicidae

Cardiocondyla minutiorintomni10yesaPDK

Hypoponera opacicepsintcarn20yesakoPDK

Family Pompilidae

Anoplius tolucaintcarn20yeskPDK

Family Sphecidae

Dryudella immigrans intcarn30yespPDK

Family Vespidae

Pseudopterocheilus pterocheiloidesend carn 01noaPDK

Order Julida

Family Blaniulidae

Proteroiulus fuscusintdetr2.575.5nokoPDK

Supplementary Table 3 continued

Mean Mean

Troph. uninv. inv.

Taxon Prov. role dens. dens. AbsentSitesDet.

Order Lepidoptera

Family Carposinidae

Carposinasp. a endherb11nooDP

Family Cosmopterigidae

Hyposmocomasp. dendherb11noaDP

Hyposmocomasp. g endherb10yeskDP

Family Crambidae

Uresiphita polygonalis virescensend herb20yesoPDK

Family Lycaenidae

Lampides boeticusintherb01nokPDK

Family Noctuidae

Agrotissp. aendherb10yesoDP

Pseudaletia unipunctaintherb10yesoDP

Family Oecophoridae

Thyrocopasp. bend herb01nooDP

Thyrocopasp. cend herb11noaDP

Family Pterophoridae

Pterophoridaesp. aintherb0.50.5nokoDP

Order Neuroptera

Family Hemerobiidae

Hemerobius pacificus intcarn2.51.3nokopCT

Micromus haleakalaeend carn10yesoCT

Sympherobius barberi intcarn11noakopCT

Order Orthoptera

Family Gryllidae

Trigonidomorpha sjostedtiintherb21nohPDK

Order Psocoptera

Family Caeciliidae

Stenocaecilius sp. a intdetr17noaEM

Family Elipsocidae

Elipsocus hyalinus int detr11nooEM

Kilauellasp. 10 end detr30yesoEM

Kilauella sp. 11 end detr20yespEM

Kilauella sp. 8 end detr0 12nooEM

Family Lachesillidae

Lachesilla tectorum intdetr2.53.5nokoEM

?Lachesilla sp.int detr11noaPDK

Family Lepidopsocidae

Lepolepis pictusintdetr4 1nohEM

Family Philotarsidae

Haplophallus?talilusint detr0.51noaoEM

Family Psocidae

Ptycta haleakalaehaleakalaeenddetr 20yesoEM

Ptycta haleakalae hualalaienddetr323nopEM

Ptycta microctena end detr10yeskEM

Order Thysanoptera

Family Aeolothripidae

Aeolothrips bicolor int carn 1.31.7noaopSN

Aeolothrips fasciatus int carn 21nopSN

Aeolothrips nasturtii int carn 01nopSN

Supplementary Table 3 continued

Mean Mean

Troph. uninv. inv.

Taxon Prov. role dens. dens. AbsentSitesDet.

Family Phlaeothripidae

Haplothrips gowdeyi int detr0.51noopSN

Haplothrips leucanthemi int detr10yeskSN

Hoplothrips sp. 1 int detr10yesaSN

Family Thripidae

Chirothrips manicatus int herb 11nokoSN

Frankliniella crotolariaeint herb 21noopSN

Neurisothrips carteriend herb0.55nokoSN

Neurisothrips sp. 1 end herb 20yesaSN

Pezothrips kellyanus intherb2.56.5nohoSN

Scirtothrips inermis intherb 01nooPDK

Thrips florum int herb 01nooSN

Thrips imaginis int herb 13nooSN

Thrips nigropilosusintherb 0.50.5nohoSN

Thrips tabaciintherb1.30.3noahoSN

aProvenance: end = endemic, int = introduced

bTrophic role: carn = carnivore, herb = herbivore, detr = detritivore, omni = omnivore, unk = unknown

cThe mean density in uninvaded plots, calculated among all sites

dThe mean density in invaded plots, calculated among all sites

eAbsent in invaded plots at all sites at which species occurred

fAll study sites at which the species was collected; a = Ahumoa, h = Huluhulu, k = Kalahaku, o = Puu O Ili, p = Pohakuloa

gSpecies determinations: KA = K. Arakaki, JB = J. Beatty, KC = K. Christiansen, CPE = C.P. Ewing, JG = J. Garb, SH = S. Hann, PDK = P. Krushelnycky, BK = B. Kumashiro, JKL = J.K. Liebherr, IM = I. MacGowan, KM = K. Magnacca, SM = S. Marshall, JM = J. Miller, EM = E. Mockford, SN = S. Nakahara, DAP = D.A. Polhemus, DP = D. Pollock, AP = A. Pont, ASR = A.S. Ramsdale, GAS = G.A. Samuelson, CT = C. Tauber, MT = M. Tremblay, PV = P. Vilkamaa.

Supplementary Table 4. One-way ANOVA comparing the log transformed population densities of non-rare species captured with each sampling technique.R2 = 1.89%

SourcedfSSFP

Sampling method20.9521.340.265

Error13949.421

LevelNMeans.d.

Litter241.5430.713

Pitfall681.3310.575

Vegetation beating501.4570.564

Supplementary Table 5. Chi-square contingency table comparing numbers of rare and non-rare species captured with ground techniques (litter and pitfall, 5 plots per area) versus the arboreal technique (vegetation beating, 8 plots per area). Each cell shows observed counts (top), expected counts (middle), and chi-square contributions (bottom).

Methodrarenon-raretotal

Litter & pitfall11178189

113.675.4

0.0610.092

Vegetation beating8250132

79.452.6

0.0880.132

Total193128321

Chi-square = 0.373, df = 1, P = 0.541

Supplementary Table 6. Chi-square contingency table showingcomparisons of population-level variation inresponses to ant invasion.Population pairs (belonging to the same arthropod species) are grouped by comparisons in which both members of the pair occur at sites invaded by the Argentine ant versus comparisons in which one member of the pair is invaded by the Argentine ant and the other is invaded by the big-headed ant. Responses are grouped according to whether or not both populations of the pairing exhibited the same response to ant invasion, according to the response categories described in the Methods. Each cell shows observed totals (top), expected totals (middle), and chi-square contributions (bottom).

Argentine - big-headed -

Argentine Argentine

comparisons comparisonstotal

Same response573794

category55.938.1

0.0210.031

Different response5942101

category60.140.9

0.0190.029

Total11679195

Chi-square = 0.100, df = 1, P = 0.752