Table 2 Core indoor arthropod community and relative over/under representation in various rooms. Included arthropod families were found in at least 20 houses and had spread to at least 4 rooms in a single house. The 11 focal taxa that were analyzed further based on proportional occurrence data are indicated with an asterisk (*). First 3 columns after taxa names indicate the percentage of total houses (max 50), the percentage of total rooms (max 554), and percentage of houses when present in >4 rooms in that house. The last six columns are reflective of whether arthropod families are over/under represented in each room type. To calculate relative over/under representation in room types, we calculated the presence ratio for each arthropod family from the core community in each of the 6 room types, then standardized proportions between families by dividing the presence ratio for each room type by the sum of all room type presence ratios for a given family. If the relative proportion for a given room is >0.167, then it is overrepresented in that room type. Conversely, if the relative proportion is <0.167, it was underrepresented. A ‘U’ denotes that the family is underrepresented by at least half (<0.0835), and an ‘O’ denotes that the family is overrepresented in that room by at least double (>0.334).

Entognatha (non-insect hexapods)

Collembola springtails

Entomobryidae slender springtails

78

19.1

18

U

Insecta (true insects)

Zygentoma silverfish

Lepismatidae (silverfish)*

68

21.3

30

U

Orthoptera grasshoppers, crickets

Rhaphidophoridae (camel crickets)*

58

12.8

12

U

O

U

U

U

Blattodea cockroaches

Blattidae (cockroaches)*

74

22.9

28

Hemiptera true bugs

Cicadellidae (leafhoppers)

82

16.2

16

U

U

O

Miridae (plant bugs)

44

6.5

2

U

U

U

O

Psocodea barklice, booklice, parasitic lice

Liposcelididae (booklice)*

98

37.4

52

U

Hymenoptera bees, wasps, ants

Braconidae (parasitoid wasps)

52

7.6

2

U

U

O

Eulophidae (chalcidoid wasps)

70

17

18

U

U

O

Formicidae (ants)

100

61.9

88

Platygastridae s.l. (parasitic wasps)

62

9.4

4

U

U

O

U

Pteromalidae (Pteromalid wasps)

52

7.6

2

U

U

U

O

Coleoptera beetles

Carabidae (ground beetles)

66

9.9

6

O

U

U

Chrysomelidae (leaf beetles)

46

6

2

U

U

U

O

U

Coccinellidae (ladybugs)

52

7.8

4

U

U

O

U

Curculionidae (snout & bark beetles)

82

15.7

16

U

O

U

Dermestidae (carpet beetles)*

100

57

78

U

Elateridae (click beetles)

74

14.6

14

U

U

O

Ptinidae (death watch & spider beetles)

60

12.1

10

U

O

Scarabaeidae (scarab beetles)

52

9.4

6

U

Silvanidae (flat bark beetles)

46

6.5

2

U

U

O

Staphylinidae (rove beetles)

54

7.2

2

U

O

Tenebrionidae (darkling beetles)

62

11.2

12

U

O

U

Lepidoptera moths, butterflies

Noctuidae (owlet moths)

44

5.8

2

U

O

Pyralidae (snout & pantry moths)*

62

11

8

U

U

U

O

Tineidae (clothes moths)*

60

8.8

4

U

U

O

Diptera flies

Calliphoridae (blow flies)

48

8.1

6

U

U

O

Cecidomyiidae (gall midges)

100

36.1

50

U

U

Ceratopogonidae (biting midges)

54

7.6

2

U

U

O

Chironomidae (non biting midges)

80

17

8

U

U

O

Culicidae (mosquitoes)*

82

19

18

U

U

U

O

Drosophilidae (fruit flies, vinegar flies)*

66

13.7

10

U

U

U

O

Muscidae (house flies)

44

6.3

2

U

O

Mycetophilidae (fungus gnats)

68

16.2

14

U

O

U

Phoridae (scuttle flies)

82

17.3

20

U

U

O

Psychodidae (sand & moth flies)*

74

18.8

22

U

O

Scatopsidae (minute black scavenger flies)

50

6.9

2

U

U

O

Sciaridae (dark winged fungus gnats)

96

42.1

60

U

Tipulidae (large crane flies)

74

15.9

14

U

O

Arachnida (arachnids)

Araneae spiders

Agelenidae (funnel weavers)

46

8.3

2

U

O

U

Gnaphosidae (ground spiders)

48

8.1

2

U

O

U

Lycosidae (wolf spiders)

40

5.8

2

U

U

O

Pholcidae (cellar spiders)*

84

28

38

U

Salticidae (jumping spiders)

50

8.3

8

U

U

U

O

Theridiidae (cobweb spiders)

100

65.3

86

Diplopoda (millipedes)

Polydesmida flat-backed millipedes

Paradoxosomatidae (millipedes)

58

12.6

14

U

O

U

Malacostraca (crustaceans)

Isopoda woodlice, pillbugs, roly-polys

Armadillidiidae (pillbugs)

78

22

28

U

O