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Appendix. Monthly and total relative abundance (numbers of individuals per litre) of the insect taxa collected during the study period
Taxa O N D J F M A M J J A S O Total CCA N°
Coleoptera
 Dryopidae
Pelonomus sp. (l) 0.67 1.15 - 0.33 - 0.02 0.06 0.21 0.04 0.06 0.01 0.02 0.03 2.61
Pelonomus sp. (a) - - - - - - 0.02 - 0.03 - - - - 0.05
 Dytiscidae
Anodocheilus sp. (a) - - - - - - - - 0.05 0.01 - - - 0.06
Bidessini (l) 13.64 11.61 - 0.25 - 14.26 - 1.18 14.30 0.54 2.34 6.21 2.90 67.22 A Au W Sp 1
Brachyvatus acuminatus (Steinheil, 1869) (a) - 0.01 - - - - - 0.09 0.20 - 0.19 0.24 0.02 0.76
Copelatus sp. (l) - - - 0.02 - - 0.02 0.004 - - - - - 0.04
Desmopachria sp. (l) 0.21 5.90 - - - 0.81 - - 0.07 - - 0.07 1.85 8.90 A Sp 2
Desmopachria sp. (a) - - - - - - - - - - 0.03 0.04 - 0.07
D. concolor Sharp, 1882 (a) 0.06 0.56 - 0.13 - 3.90 0.12 0.05 0.16 - 2.90 4.03 2.28 14.19 A W 3
Laccophilus sp. (l) 0.03 5.87 1.33 - - - 0.02 - - - - 0.03 0.54 7.83 A Sp 4
Laccophilus sp. (a1) 0.10 0.35 - 0.22 - 6.91 - 0.07 0.22 - 1.01 0.68 0.03 9.59
Laccophilus sp. (a2) - 0.01 - - - 1.33 - 0.01 0.03 - 0.06 0.07 - 1.51
Lancetes sp. (l) - 0.25 - - - 13.08 0.03 0.19 1.80 - 0.13 0.08 - 15.55 Au 5
Liodessus sp. (a) 2.57 8.80 - 0.82 - 6.64 1.83 2.72 0.66 10.24 4.39 19.30 65.59 123.6 A Au W Sp 6
Vatellus haagi Wehncke, 1876 (l) - 0.36 - - - 7.98 - - - - - - - 8.35 Au 7
V. haagi (a) - 0.04 - - - 0.01 - - - - - - - 0.05
Megadytes glaucus (Brullé, 1836) (l) - - - - - - - - - - - 0.03 - 0.03
M. glaucus (a) - - - - - - 0.01 - - - - - - 0.01
Rhantus signatus (Fabricius, 1775) (l) 1.79 2.57 - 0.06 - 3.42 0.24 4.08 6.86 7.79 1.42 1.45 1.78 31.46 A Au W Sp 8
R. signatus (a) 0.02 - - - - 0.03 - 0.01 - - 0.01 0.01 0.02 0.10
Thermonectus succinctus (Aubé, 1838) (l) 0.05 2.35 - - - 6.51 - 0.02 - - - 0.15 5.64 14.71
T. succinctus (a) 0.08 0.38 - - - 0.03 - 0.02 - - - - 0.17 0.68
  Gyrinidae
Neogyrinus ovatus (Aubé, 1938) (a) - - - - - 0.12 - 0.03 0.03 - 0.96 0.05 0.06 1.26
 Haliplidae
Haliplus sp. (a) 0.01 - - - - - - 0.02 0.03 - 0.03 0.10 - 0.19
 Hydrochidae
Hydrocus richteri Bruch, 1915 (a) - - - - - - - 0.01 0.01 - - - - 0.02
 Hydrophilidae
Berosus sp. (l) - 0.53 - - - 0.87 0.12 4.37 5.74 1.80 0.58 0.18 0.45 14.64 A Au W 9
Berosus sp. (a) - 0.08 - 0.01 - 1.11 0.41 0.27 0.07 - 0.10 0.07 0.62 2.75 Au 10
Derallus sp. (l) - - - - - - - - - - - - 0.32 0.32
D. paranensis Oliva, 1981 (a) 0.01 0.05 - 0.11 - 0.56 - 0.11 0.11 0.11 0.13 0.08 0.32 1.57
Dibolocelus sp. (l) - 0.02 - - - - - - - - - - - 0.02
Enochrus sp. (l) 0.26 2.02 - 0.82 - 7.88 0.04 - 0.13 0.71 0.08 0.12 2.80 14.87 A Au Sp 11
E. variegatus (Steinheil, 1869) (a) 0.01 0.19 - - - 0.02 - 0.21 0.04 0.14 0.11 0.01 0.31 1.04
E. vulgaris (Steinheil, 1869) (a) 0.03 0.31 - - - 1.56 0.03 0.21 0.28 0.03 0.06 - 0.11 2.64
Paracymus sp. (l) 0.19 1.56 - 0.07 - 0.09 0.03 0.01 - - - 0.21 1.58 3.73 Sp 12
Paracymus sp. (a) 0.56 1.03 - 0.97 - 3.71 0.19 1.14 0.45 0.17 0.95 0.97 0.80 10.91 A Au W 13
Tropisternus sp. (l) 1.73 11.75 - - - 8.70 0.14 1.82 23.92 2.25 1.66 7.05 12.11 71.13 A Au W Sp 14
T. burmeisteri Fernández & Bachmann, 1981 (a) - - - - - - - 0.00 - - - - 0.03 0.03
T. ignoratus Knisch, 1921 (a) 0.67 1.54 - - - 0.03 - 0.02 0.03 0.03 0.03 0.08 0.05 2.48
T. lateralis (Brullé, 1837) (a) 0.08 0.24 - 0.07 - 0.36 - 0.01 0.05 - 0.01 0.29 0.08 1.20
T. scutellaris Castelnau, 1840 (a) - 0.01 - - - - - - - - - - - 0.01
T. setiger (Germar, 1824) (a) 0.66 1.52 - 0.68 - 1.05 0.40 0.72 0.42 0.11 0.83 0.71 0.88 7.99 A Au 15
 Noteridae
Hydrocanthini (l) 0.02 3.01 - - - 4.53 - - - - - - 0.74 8.31
Hydrocanthus sp. (a) - 0.06 - - - - - - 0.04 - 0.03 - - 0.13
Suphis sp. (l) - 0.94 - - - - - - - - - - - 0.94
S. cimicoides Aubé, 1836 (a) 0.01 0.03 - - - - - - - - - - - 0.04
S. notaticollis Zimmermann, 1921 (a) 0.02 0.68 - - - 0.03 - 0.01 - - - 0.10 - 0.83
Suphisellus sp. (a) 0.41 7.89 - 0.38 - 0.86 - 0.10 0.02 0.03 1.10 2.29 2.56 15.64 A Sp 16
Diptera
 Ceratopogonigae (l,p) - 0.04 - - - - 0.03 - - - - 0.17 0.16 0.40
  Dasyheleinae (l,p) 0.02 - - - - - 0.05 - - - - - 2.09 2.16
   Forcypominae (l,p) - 0.10 - - - 2.06 0.04 0.00 0.11 0.16 - 0.13 0.18 2.78
 Chaoboridae (l) - - - - - 0.04 - - - - - - - 0.04
 Chironomidae
  Chironominae (l,p) 27.40 80.06 - 0.33 - 21.99 1.33 22.37 1.66 0.29 2.74 5.52 4.44 168.1 A Au W Sp 17
  Orthocladiinae (l,p) 48.74 24.57 - - - - 0.13 1.45 1.29 1.14 97.09 10.53 9.89 194.8 A Au W Sp 18
  Tanypodinae (l,p) 3.41 30.74 - - - 3.36 0.01 6.66 13.05 0.18 1.37 5.49 11.25 75.52 A Au W Sp 19
 Culicidae
Anopheles sp. (l) - 0.05 - - - - - 0.02 0.08 - - 0.27 - 0.42
Culex sp. (l) 1.84 3.16 - - - 4.84 4.17 5.39 7.18 0.67 0.73 2.39 83.15 113.5 A Au Sp 20
Culex sp. (p) 0.01 0.23 - - - 3.23 - - - - - - 0.17 3.64
Cx. apicinus Philippi, 1865 (l) - - - - - - - 0.04 - - - - - 0.04
Cx. eduardoi Casal & García, 1968 (l) 0.16 1.33 - - - - 0.05 0.88 8.35 - 0.06 2.97 87.06 100.9 A Au 21
Cx. dolosus (Lynch A., 1891) (l) - 0.06 - - - - - 3.57 - - - - - 3.63
Cx. maxi Dyar, 1928 (l) - 0.11 - - - 3.47 0.02 0.44 0.15 - - 0.05 21.83 26.07
Cx. tatoi Casal & García, 1971 (l) - - - - - 0.05 - 0.22 - - - - - 0.27
Ochlerotatus sp. (l) 8.10 0.01 - 0.35 - - 0.30 - - 0.32 0.13 0.41 0.29 9.91
Ochlerotatus sp. (p) 0.49 - - - - - 28.22 1.06 - - - - - 29.78 Au 22
Oc. albifasciatus (Macquart, 1836) (l) 21.55 - - 0.66 - 0.12 34.56 0.56 - 0.44 0.03 0.20 0.07 58.21 A Au 23
Oc. crinifer (Theobald, 1903) (l) - - - - - - 0.08 0.03 - 0.27 - - - 0.38
Oc. scapularis (Rondani, 1848) (l) - - - - - - 0.24 0.03 - - - 0.02 - 0.29
Psorophora sp. (l) 0.08 - - 0.15 - 0.02 0.004 0.01 - - - - 0.04 0.30
Ps. cyannescens (Coquillett, 1902) (l) - 0.05 - 0.22 - - - - - - - 0.08 - 0.35
Ps. ferox (von Humboldt, 1819) (l) 0.08 - - - - - - - - - - - - 0.08
Uranotaenia sp. (l) - 0.03 - - - - - - - - - 0.04 1.11 1.18
 Ephidridae (l,p) 0.28 1.80 - 0.99 - 0.23 0.02 - - - 0.17 - 0.40 3.90
 Muscidae (l,p) 1.66 12.92 1.33 5.79 - 3.97 2.09 1.98 2.03 2.81 1.03 1.47 2.67 39.74 A Au W Sp 24
 Sciomyzidae (l,p) 0.01 4.47 - - - - - - 0.02 0.08 - 0.04 1.10 5.72 A Sp 25
 Stratiomyiidae
Hedriodiscus sp. (l) - 1.70 - 0.10 - 0.02 - - - - - - - 1.81
 Syrphydae (l) - - - - - - - - - - - - 0.20 0.20
 Tipulidae
  Limoniinae (l,p) 0.08 0.22 - - - 0.03 0.01 0.04 - 0.11 0.11 0.15 0.57 1.33
Limonia sp. (l) 0.13 0.01 - - - - 0.01 - - - - - - 0.14
Rhabdomastix sp. (l) - - - - - - - - - 0.01 - - - 0.01
Ephemeroptera
 Baetidae
Callibaetis sp. (l) 27.90 71.04 26.67 1.09 - 24.88 1.22 19.09 56.92 - 0.12 4.77 39.26 273.0 A Au Sp 26
Heteroptera
 Belostomatidae
Belostoma sp. (l) 0.43 21.01 - - - 8.50 0.03 - - - - - 1.66 31.64 A Au 27
B. elegans (Mayr, 1871) (a) 0.10 0.17 - - - 0.05 - - - - 0.13 0.13 0.06 0.65
B. micantulum (Stål, 1860) (a) - - - - - 0.06 - - - - - - - 0.06
B. oxyurum (Dufour, 1863) (a) - - - 0.04 - - - - - - - - - 0.04
B. plebejum (Stål, 1860) (a) - - - - - - - 0.01 - - - - - 0.01
 Corixidae
Sigara sp. (l) 9.01 35.15 - - - 35.96 - 2.62 66.77 0.19 0.60 20.16 39.07 209.5 A Au W Sp 28
S. argentiniensis Hungerford, 1948 (a) - 0.02 - - - 0.01 - - 0.01 - - - - 0.04
S. chrostowskii Jaczewski, 1927 (a) - - - - - - - 0.06 0.01 - 0.04 - - 0.12
S. denseconscripta (Breddin, 1897) (a) - 0.01 - - - - 0.01 - - - - - - 0.02
S. platensis Bachmann, 1962 (a) 1.40 12.85 5.33 0.42 - 0.42 0.42 2.42 3.98 6.24 12.72 7.29 5.71 59.21 A Au W Sp 29
S. rubyae (Hungerford, 1928) (a) - 0.04 - - - - 0.01 - - 0.04 - - - 0.09
S. shadei (Hungerford, 1928) (a) - - - - - - - 0.01 - - - - - 0.01
 Gerridae
Limnogonus ignotus Drake & Harris, 1934 (a) 0.01 0.02 - - - - - 0.01 0.01 - 0.06 - - 0.11
 Hebridae
Lipogomphus sp. (l) - 0.65 - - - - - - - - - - - 0.65
L. lacuniferus Berg, 1879 (a) 0.11 0.80 - 0.79 - 0.59 - 0.18 0.08 0.04 0.08 0.04 0.08 2.78
 Hydrometridae
Hydrometra sp. (l) 0.09 3.27 - - - 1.78 0.07 - - - - 0.04 1.01 6.25 Sp 30
H. argentina Berg, 1879 (a) - 1.04 - 0.24 - 0.92 - 0.03 0.06 0.04 0.59 0.20 1.14 4.27
 Mesoveliidae
Mesovelia sp. (l) - 0.10 - - - - - - - - - - - 0.10
M. mulsanti White, 1879 (a) - - - - - 0.07 - 0.04 0.06 - 0.20 - - 0.37
 Nepidae
Ranatra sp. (l) - 0.05 - - - - - - - - - - - 0.05
R. sjostedti Montandon, 1911 (a) - - - 0.23 - - - - - - - - - 0.23
 Notonectidae
Buenoa sp. (l) - 3.03 8.00 - - - - 0.01 - - - 0.04 - 11.09
B. fuscipennis (Berg, 1879) (a) 0.05 0.03 - 0.06 - 0.08 2.41 0.67 1.08 - 0.28 0.18 - 4.84 Au Sp 31
B. salutis Kirkaldy, 1904 (a) 0.13 - - - - - - 0.11 0.31 - - - - 0.55
Notonecta sp. (l) 0.01 4.79 5.33 - - 1.07 0.06 0.10 0.32 0.04 0.03 0.42 3.02 15.19 A Sp 32
N. sellata Fieber, 1851 (a) 0.27 0.90 - 0.35 - 0.03 0.18 0.31 0.33 0.10 1.16 0.84 0.04 4.53 A W 33
 Pleidae
Neoplea sp. (l) 0.07 3.06 - - - - - - - - - - - 3.13
N. maculosa (Berg, 1879) (a) 0.93 0.90 - 0.18 - 0.38 0.06 0.20 0.26 0.06 2.32 1.72 0.83 7.85 A W Sp 34
 Veliidae
Microvelia sp. (l) - 18.58 - - - - - - - - - - - 18.58 Sp 35
M. mimula White, 1879 (a) 0.13 1.99 - 1.36 - 0.65 0.26 0.13 0.06 - - - - 4.58
Odonata
 Anisoptera (l) 0.13 13.63 6.67 0.13 - 0.04 0.01 - - - - - 0.33 20.93 A Sp 36
  Aeshnidae (l) 0.004 1.32 - - - 0.01 0.03 - - - - - - 1.37
  Libellulidae (l) 0.04 0.66 - - - - - - - - - - - 0.71
 Zygoptera (l) 0.90 22.63 1.33 - - - 0.01 - 0.01 - - 0.04 10.17 35.09 A Sp 37
  Coenagrionidae (l) 0.08 3.42 - - - - - - - - - - 0.04 3.54
Lestes sp. (l) - 2.27 2.67 - - 0.03 - - - - - - 0.74 5.70
Trichoptera
 Hydroptilidae
Oxyethira sp. (l) - 0.02 - - - - - - - - - 0.10 - 0.11

a = adult, l = larva, p = pupa

A = annual, Au = autumn, W = winter and Sp = spring

The taxa selected as indicators in the canonical correspondence analysis (CCA) are indicated

Numbers refer to the species represented in the CCA ordination graphic shown in Figure 4.

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