Table 3 Total number of species (N ₀) and average (±SE) of species richness, species diversity (H), evenness, total abundance, abundance without mussels, biomass, biomass without mussels, and abundances of dominant species in Limfjorden at the small spatial scale: nm-site (n = 9, samples without mussels or 1 individual) and m-site (n = 16, samples with mussels)

N ₀

12

20

Species richness

3.78 ± 0.36

7.31 ± 0.50

<0.01

Diversity (H)

1.02 ± 0.11

0.70 ± 0.05

<0.01

Evenness

0.77 ± 0.03

0.35 ± 0.02

<0.01

Abundance (ind. m⁻²)

922 ± 53

7,250 ± 752

<0.01

Abundance without mussel (ind. m⁻²)

846 ± 50

1,182 ± 213

ns

Biomass (g AFDW m⁻²)

17.8 ± 3.4

473 ± 61

<0.01

Biomass without mussel (g AFDW m⁻²)

11.9 ± 1.9

7.4 ± 1.5

0.05

Pectinaria koreni (ind. m⁻²)

561 ± 52

348 ± 77

ns

Nereis sp. (ind. m⁻²)

0

123 ± 19

<0.01

Harmothoe impar/imbracata (ind. m⁻²)

0

96 ± 23

<0.01

Capitella capitata (ind. m⁻²)

0

59 ± 33

ns

Polydora sp. (ind. m⁻²)

0

48 ± 22

<0.05