Table S1. List of fish species observed on Bahamian coral reefs and their morphological and behavioural characteristics which are hypothesized to affect vulnerability to predation by invasive lionfish. (See Methods section for detailed description of the classification process). Bolding indicates species that were identified as lionfish prey from either our in situ observation of lionfish on reefs off Eleuthera Island or within stomach contents of lionfish sampled from reefs off New Providence Island, The Bahamas. For prey attributes with a binary state, a value of 0 reflects the absence of the trait, and a value of 1 denotes its presence in a species. Family Species name Cleaner Acanthuridae Acanthurus bahianus 0 Acanthuridae Acanthurus chirurgus 0 Acanthuridae Acanthurus coeruleus 0 Apogonidae Apogon binotatus 0 Apogonidae Apogon maculatus 0 Apogonidae Apogon planifrons 0 Apogonidae Apogon quadrisquamatus 0 Apogonidae Apogon townsendi 0 Cleaning type noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning Presence of physical or chemical defense Position in water column Group size 0 demersal solitary 1 2.7 0 demersal solitary 1 2.3 0 demersal solitary 1 2.0 1 demersal solitary 0 5.3 1 demersal solitary 0 4.0 1 demersal solitary 0 5.1 1 demersal shoaling 0 4.6 1 demersal solitary 0 4.9 Nocturnal Total length:Body depth ratio Apogonidae Phaeoptyx pigmentaria 0 Atherinidae Atherinomorus sp. 0 Aulostomidae Aulostomus maculatus 0 Blenniidae Ophioblennius macclurei 0 Bothidae Bothus ocellatus 0 Callionymidae Carangidae Callionymus bairdi Carangoides ruber 0 1 Carangidae Decapterus macarellus 0 Carangidae Elagatis bipinnulata 0 Carangidae Selar crumenophthalmus 0 Chaenopsidae Acanthemblemaria aspera 0 Chaenopsidae Acanthemblemaria maria 0 Chaenopsidae Acanthemblemaria spinosa 0 Chaenopsidae Emblemaria pandionis 0 Chaenopsidae Emblemariopsis bahamensis 0 Chaetodontidae Chaetodon capistratus 0 Chaetodontidae Chaetodon ocellatus 0 noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning facultative noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning 1 demersal solitary 0 4.5 0 demersal schooling 0 6.4 0 demersal solitary 0 14.4 0 benthic solitary 0 5.0 0 benthic solitary 0 1.9 0 0 benthic pelagic solitary shoaling 0 0 9.3 3.7 0 pelagic schooling 0 4.9 0 pelagic schooling 0 5.7 0 pelagic schooling 0 4.7 0 benthic solitary 0 7.8 0 benthic solitary 0 11.7 0 benthic solitary 0 14.0 0 benthic solitary 0 7.2 0 benthic solitary 0 7.0 0 demersal solitary 0 1.9 0 demersal solitary 0 2.1 Chaetodontidae Chaetodon striatus 0 Chaetodontidae Prognathodes aculeatus 0 Cirrhitidae Amblycirrhitus pinos 0 Diodontidae Diodon holocanthus 0 Gobiidae Coryphopterus bol 0 Gobiidae Coryphopterus dicrus 0 Gobiidae 0 Gobiidae Coryphopterus eidolon Coryphopterus glaucofraenum Gobiidae Coryphopterus hyalinus 0 Gobiidae Coryphopterus lipernes 0 Gobiidae Coryphopterus personatus 0 Gobiidae Gobiidae Gobiidae Ctenogobius saepepallens Elacatinus evelynae Elacatinus genie 0 1 1 Gobiidae Elacatinus horsti 0 Gobiidae Gnatholepis thompsoni 0 Gobiidae Gobiidae Lythrypnus spilus Oxyurichthys stigmalophius 0 0 0 noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning obligate obligate noncleaning noncleaning noncleaning non- 0 demersal solitary 0 1.9 0 demersal solitary 0 2.1 0 benthic solitary 0 3.4 1 demersal solitary 1 5.0 0 benthic solitary 0 7.1 0 benthic solitary 0 6.0 0 benthic solitary 0 6.6 0 benthic solitary 0 5.6 0 demersal schooling 0 5.8 0 benthic solitary 0 6.7 0 demersal schooling 0 6.2 0 0 0 benthic benthic benthic solitary solitary solitary 0 1 1 8.7 7.1 6.7 0 benthic solitary 0 5.8 0 benthic solitary 0 6.4 0 0 benthic benthic solitary solitary 0 0 5.6 7.3 Gobiidae Grammatidae Priolepis hipoliti Gramma loreto 0 1 Grammatidae Gramma melacara 0 Haemulidae Haemulon aurolineatum 0 Haemulidae Haemulon flavolineatum 0 Haemulidae Haemulon melanurum 0 Haemulidae Haemulon plumierii 0 Haemulidae Haemulon sciurus 0 Holocentridae Holocentrus adscensionis 0 Holocentridae Holocentrus rufus 0 Holocentridae Myripristis jacobus 0 Holocentridae Neoniphon marianus 0 Holocentridae Plectrypops retrospinis 0 Holocentridae Sargocentron coruscum 0 Inermiidae Labridae Inermia vittata Bodianus rufus 0 1 Labridae Clepticus parrae 0 cleaning noncleaning facultative noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning facultative noncleaning 0 0 benthic demersal solitary shoaling 0 0 5.4 4.1 0 demersal shoaling 0 4.7 0 demersal schooling 0 4.2 0 demersal schooling 0 4.0 0 demersal schooling 0 4.3 0 demersal schooling 0 3.6 0 demersal schooling 0 3.3 1 demersal solitary 1 4.3 1 demersal solitary 1 4.4 1 demersal shoaling 1 3.5 1 demersal solitary 1 4.0 1 demersal solitary 1 3.1 1 demersal solitary 1 4.5 0 0 pelagic demersal schooling solitary 0 0 5.5 4.1 0 demersal shoaling 0 4.4 Labridae Halichoeres bivittatus 1 Labridae Halichoeres garnoti 0 Labridae Labridae Halichoeres maculipinna Halichoeres pictus 0 1 Labridae Labridae Halichoeres radiatus Thalassoma bifasciatum 0 1 Labridae Xyrichtys martinicensis 0 Labrisomidae Labrisomus haitiensis 0 Labrisomidae Malacoctenus boehlkei 0 Labrisomidae Malacoctenus gilli 0 Labrisomidae Starksia hassi 0 Lutjanidae Ocyurus chrysurus 0 Malacanthidae Malacanthus plumieri 0 Monacanthidae Cantherhines pullus 0 Monacanthidae Monacanthus tuckeri 0 Mullidae Mulloidichthys martinicus 0 Mullidae Pseudupeneus maculatus 0 Muraenidae Gymnothorax miliaris 0 facultative noncleaning noncleaning facultative noncleaning facultative noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning 0 demersal shoaling 0 5.7 0 demersal shoaling 0 5.8 0 0 demersal demersal shoaling shoaling 0 0 5.1 5.6 0 0 demersal demersal shoaling shoaling 0 0 4.8 5.3 0 demersal solitary 0 6.3 0 benthic solitary 0 4.9 0 benthic solitary 0 5.3 0 benthic solitary 0 4.8 0 benthic solitary 0 5.6 0 demersal schooling 0 4.1 0 demersal solitary 0 8.4 0 demersal solitary 1 2.3 0 demersal solitary 1 3.0 0 demersal shoaling 0 4.9 0 demersal shoaling 0 5.0 0 benthic solitary 1 10.8 Opistognathidae Opistognathus aurifrons 0 Ostraciidae Lactophrys triqueter 0 Pomacanthidae Pomacanthidae Centropyge argi Holacanthus ciliaris 0 1 Pomacanthidae Pomacanthidae Pomacentridae Holacanthus tricolor Pomacanthus paru Abudefduf saxatilis 0 1 1 Pomacentridae Chromis cyanea 0 Pomacentridae Chromis insolata 0 Pomacentridae Pomacentridae Chromis multilineata Microspathodon chrysurus 0 1 Pomacentridae Stegastes diencaeus 0 Pomacentridae Stegastes dorsopunicans 0 Pomacentridae Stegastes leucostictus 0 Pomacentridae Stegastes partitus 0 Pomacentridae Stegastes planifrons 0 Pomacentridae Stegastes variabilis 0 Pterelotridae Scaridae Pterelotris helenae Cryptotomus roseus 0 0 noncleaning noncleaning noncleaning facultative noncleaning facultative facultative noncleaning noncleaning noncleaning facultative noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning non- 0 benthic solitary 0 4.6 0 demersal solitary 1 2.0 0 0 demersal demersal solitary solitary 1 1 2.5 2.0 0 0 0 demersal demersal demersal solitary solitary shoaling 1 1 0 2.0 1.6 2.5 0 demersal shoaling 0 3.7 0 demersal shoaling 0 3.8 0 0 demersal demersal shoaling solitary 0 0 3.9 2.6 0 demersal solitary 0 3.0 0 demersal solitary 0 2.8 0 demersal solitary 0 3.1 0 demersal solitary 0 3.0 0 demersal solitary 0 2.6 0 demersal solitary 0 2.9 0 0 demersal demersal solitary shoaling 0 0 7.3 5.7 Scaridae Scarus coeruleus 0 Scaridae Scarus iserti 0 Scaridae Scarus taeniopterus 0 Scaridae Sparisoma atomarium 0 Scaridae Sparisoma aurofrenatum 0 Scaridae Sparisoma viride 0 Sciaenidae Equetus punctatus 0 Scorpaenidae Pterois volitans 0 Serranidae Cephalopholis cruentata 0 Serranidae Cephalopholis fulva 0 Serranidae Epinephelus adscensionis 0 Serranidae Epinephelus guttatus 0 Serranidae Epinephelus striatus 0 Serranidae Hypoplectrus gummigutta 0 Serranidae Hypoplectrus guttavarius 0 Serranidae Hypoplectrus indigo 0 cleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning 0 demersal solitary 0 4.2 0 demersal shoaling 0 4.6 0 demersal shoaling 0 4.8 0 demersal shoaling 0 3.9 0 demersal shoaling 0 4.7 0 demersal shoaling 0 4.1 1 demersal solitary 0 4.7 1 demersal shoaling 0 3.9 0 demersal solitary 0 4.6 0 demersal solitary 0 4.1 0 demersal solitary 0 4.5 0 demersal solitary 0 4.0 0 demersal solitary 0 3.9 0 demersal solitary 0 3.0 0 demersal solitary 0 3.0 0 demersal solitary 0 2.9 Serranidae Hypoplectrus nigricans 0 Serranidae Hypoplectrus puella 0 Serranidae Hypoplectrus unicolor 0 Serranidae Liopropoma mowbrayi 0 Serranidae Liopropoma rubre 0 Serranidae Rypticus subbifrenatus 0 Serranidae Serranus tabacarius 0 Serranidae Serranus tigrinus 0 Synodontidae Synodus intermedius 0 Synodontidae Synodus saurus 0 Synodontidae Synodus synodus 0 Tetraodontidae Canthigaster rostrata 0 Tripterygiidae Enneanectes altivelis 0 noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning noncleaning 0 demersal solitary 0 3.0 0 demersal solitary 0 3.3 0 demersal solitary 0 3.3 0 demersal solitary 0 4.6 0 demersal solitary 0 4.6 0 demersal solitary 0 4.0 0 demersal solitary 0 4.9 0 demersal solitary 0 5.6 0 benthic solitary 0 13.5 0 benthic solitary 0 11.5 0 benthic solitary 0 13.5 0 demersal solitary 0 3.1 0 benthic solitary 0 6.1