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Table 1 Summary of the six communities, their habitat types and environmental variables

From: Spatial variability in structural and functional aspects of macrofauna communities and their environmental parameters in the Jade Bay (Wadden Sea Lower Saxony, southern North Sea)

  Community 1
Hydrobia ulvae
partially covered with seagrass beds
Community 2
Mudflats
Community 3
Mixed sediments 1
Community 4
Mixed sediments 2
Community 5
Sandflats
Community 6
Subtidal
(n = 39) (n = 43) (n = 15) (n = 13) (n = 14) (n = 4)
Environment
 Median grain size (μm) 66 (6) 30 (4) 59 (9) 76 (13) 166 (16) 153 (18)
 Mud content (%) 49 (4) 76 (3) 55 (5) 46 (7) 9 (2) 18 (2)
 TOC (%) 0.7 (0.1) 0.97 (0.1) 0.7 (0.1) 0.5 (0.2) 0.11 (0.01) 0.6 (0.3)
 Chl a (mg/m²) 9 (0.4) 54 (3.2) 3 (0.2) 7 (0.9) 0.6 (0.1) 0.4 (0.03)
 Submergence time (h) 8.53 6.07 10.72 14.51 10.49 24
Macrobenthos
 S (total/79 cm²) 37 33 26 14 26 47
 S (mean/79 cm²) 10 (0.7) 16 (0.6) 11 (0.69) 6 (0.68) 10 (0.81) 23 (8)
 Mean abundance (ind./m²) 145,165 (13614) 30,492 (3665) 3,791 (853) 940 (143) 4,977 (2375) 3,991 (2547)
 H′ 0.12 (0.03) 1.38 (0.06) 1.5 (0.13) 1.21 (0.13) 1.4 (0.16) 2.3 (0.19)
 Eveness J′ 0.05 (0.01) 0.5 (0.02) 0.62 (0.05) 0.67 (0.05) 0.62 (0.08) 0.81 (0.06)
Characteristic species (mean abundance ind./m²) Hyd ulv 142,809 Tub ben 9,241 Cau kil 1,165 Sco arm 193 Hyd ulv 3,968 Sco arm 728
  Cer edu 159 Hyd ulv 10,151 Pyg ele 326 Hyd ulv 238 Sco arm 164 Mic mac 205
  Ret obt 186 Pygo ele 2,531 Hyd ulv 1,458 Cau kil 182 Uro pos 353 Lan con 1,026
  Pygo ele 318 Cor spp. 2,972 Tub ben 133 Ret obt 68 Bat sar 85 Pyg ele 199
  Mac bal 63 Ner spp. 1,108 Sco arm 108 Ret spp. 28 Nep spp. 24 Ari min 32
  Tub ben 993 Ret obt 828 Nep hom 34 Nep spp. 21 Nep hom 20 Ret obt 42
  Nep hom 14 Cor vol 507 Amp acu 72    Cum goo 17 Nym brev 55
    Het fil 240      Bat pilosa 60 Ete lon 190
          Ete lon 20 Phy muc 221
Trophic structure
 Surface deposit feeders 99   43   46   28   81   4  
 Subsurface deposit feeders 1   40   9   34   5   30  
 Interface feeders    5   36   22   1   40  
 Sand-lickers    0   0   0   11   0  
 Predatores    10   7   14   2   20  
  1. The most dominant species characterizing the different communities are given in bold. Mean values are given for median grain size (μm), mud (%), TOC (%), Chl a (mg/m²) contents and submergence time (h), total number (S total) and mean number of species (S mean) per 79 cm², mean abundance (ind./m²), Shannon-Wiener diversity index (H′), eveness (J′), characteristic species (ind./m2) and feeding type structure (%). Standard errors are given in parentheses. For abbreviation of the macrofauna species names see Appendix Table 5