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Table 8 Top-ranked species densities (quadrat sampling, mean per 0.1 m2 ± SD) of macrofauna inside and outside Sabellaria alveolata reefs at three sites from the west coast of Cotentin

From: Macrofauna associated with temporary Sabellaria alveolata reefs on the west coast of Cotentin (France)

Site

Rank

Inside Reef

Outside Reef

Species

Mean density ± SD

 

Mean density ± SD

Saint-Germain-sur-Ay

 

16a–3.9b

 

21a–7.9b

 

1

Sabellaria alveolata

22.90 ± 15.62

Gibbula umbilicalis

11.00 ± 11.87

2

Gibbula umbilicalis

3.50 ± 3.31

Boccardia polybranchia

10.90 ± 27.62

3

Gibbula pennanti

1.10 ± 1.66

Gibbula cineraria

6.90 ± 6.21

4

Gibbula cineraria

0.30 ± 0.67

Patella ulyssiponensis

4.70 ± 3.33

5

Mytilus edulis

0.20 ± 0.63

Patella vulgata

4.50 ± 5.04

Blainville-sur-Mer

 

11a–3.7b

 

18a–5.3b

 

1

Sabellaria alveolata

43.40 ± 24.36

Gibbula pennanti

8.50 ± 11.31

2

Gibbula umbilicalis

7.80 ± 7.39

Gibbula umbilicalis

5.70 ± 7.04

3

Gibbula pennanti

1.70 ± 3.68

Gibbula cineraria

5.50 ± 12.34

4

Gibbula cineraria

0.70 ± 2.21

Patella ulyssiponensis

3.40 ± 3.37

5

Nassarius reticulatus

0.60 ± 0.84

Patella vulgata

3.40 ± 3.50

Champeaux

 

7a–3.3b

 

15a–4.4b

 

1

Sabellaria alveolata

99.00 ± 58.93

Spisula solida

6.38 ± 2.97

2

Sphaeroma spp

55.20 ± 42.54

Macoma balthica

6.13 ± 5.57

3

Golfingia vulgaris

1.10 ± 1.97

Sphaeroma spp

2.75 ± 3.81

4

Mytilus edulis

0.60 ± 0.97

Venerupis philippinarum

1.25 ± 1.39

5

Carcinus maenas

0.30 ± 0.48

Crepidula fornicata

0.75 ± 2.12

  1. See “Appendix 3” for taxonomic details and complete species list
  2. aTotal species number and
  3. bMean species/number per 0.1 m2 quadrat