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Table 4 Macroinvertebrate taxa occurring in the study area, with indication of their presence in the different habitats, and in the hypersaline reference community (REF 1983); mean density of macroinvertebrate taxa during the study period, and P-levels of significance of the Mann-Whitney U paired test for comparisons between disturbed and re-established conditions for a given month.

From: Response of biotic communities to salinity changes in a Mediterranean hypersaline stream

     Habitat REF 1983 Mean density (ind m-2) Mann-Whitney U test
Order Family/Subfamily Genus/species code Run Pool   J3 O3 J4 O4 J3–J4 O3–O4
Oligochaeta Tubificidae   tubi +      1035   ** n.s.
Gastropoda Hydrobiidae Potamopyrgus antipodarun poan + +   1125 5124 657 972 n.s. n.s.
Neotaenioglossa Melanopsidae Melanopsis praemorsa mela +     7    n.s. n.s.
Ephemeroptera Baetidae Cloeon schoenemundi clsh + +   377 287 7 112 ** n.s.
Odonata Aeshnidae Anax sp. anax   +    14    n.s. n.s.
Diptera Chironomidae/Chironominae Chironomus salinarius chsa + +   38920 2978 3977 7640 n.s. n.s.
  Chironomidae/Chironominae Chironomus sp. chir + +   210 7    n.s. n.s.
  Chironomidae/Tanypodinae   tanp   +   245 14    n.s. n.s.
  Chironomidae/Orthocladiinae Halocladius varians hava + +   2691 538 4592 329 n.s. n.s.
  Ceratopogonidae   cera + +   105 7    ** n.s.
  Culicidae   culi   +    7   7 n.s. n.s.
  Ephydridae Ephydra flavipes epfl + + + 203 105 49 3940 n.s. **
  Dolichopodide   doli   +      7 n.s. n.s.
  Stratiomyidae Stratiomys longicornis stlo + + + 7 7 21 147 n.s. n.s.
  Simuliidae   simu +    147 336    n.s. *
Heteroptera Corixidae Sigara selecta sise   + + 3942 1014 804 126 n.s. **
Coleoptera Dytiscidae Nebrioporus ceresyi nece + + + 391 217 21 7 ** n.s.
   Nebrioporus baeticus neba + + + 259 391 112   n.s. **
  Hydrophilidae Berosus hispanicus behi   + + 28 189   75 n.s. n.s.
   Enochrus falcarius enfa + + + 405 77 496 154 n.s. n.s.
   Enochrus bicolor enbi +       7 n.s. n.s.
  Hydraenidae Ochthebius cuprescens occu + + + 147 84 161 28 n.s. n.s.
   Ochthebius delgadoi ocde +    7 14 7 14 n.s. n.s.
   Ochthebius tudmirensis octu +    7   7   n.s. n.s.
   Ochthebius corrugatus occo + +   7    496 n.s. **
  1. *P < 0.05, **P < 0.01