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Table 1 Seaweed community features (species richness, proportions of Rhodophyta, Chlorophyta and Heterokontophyta, ESG ratio and functional group composition) for 8 sections of shore within the bay of Ferraria and 3 sections of shore in Porto Formoso

From: Intertidal rocky shore seaweed communities subject to the influence of shallow water hydrothermal activity in São Miguel (Azores, Portugal)

Site

Ferraria

Porto Formoso

Substratum type

Vertical bedrock

Boulders

Pebbles/small boulders

Shore section

A

B

C

D

Average

A

B

C

D

Average

A

B

C

Average

Species richness

11

11

18

19

14.8

9

16

16

14

13.8

10

18

19

15.7

Proportions

 Rhodophyta

0.45

0.64

0.61

0.68

0.60

0.22

0.38

0.38

0.36

0.34

0.60

0.61

0.53

0.58

 Chlorophyta

0.36

0.18

0.22

0.21

0.24

0.67

0.38

0.31

0.29

0.41

0.20

0.17

0.21

0.19

 Heterokontophyta

0.18

0.18

0.17

0.11

0.16

0.11

0.25

0.31

0.36

0.26

0.20

0.22

0.26

0.23

ESG ratio

0.57

0.83

1.00

0.58

0.75

0.29

0.33

0.14

0.27

0.26

1.50

0.80

2.80

1.70

Proportions

 FG1

0

0

0

0

0.00

0

0

0.06

0

0.02

0

0

0

0.00

 FG2

0.27

0.27

0.28

0.32

0.29

0.33

0.38

0.31

0.29

0.33

0.10

0.06

0.05

0.07

 FG3

0.36

0.18

0.22

0.16

0.23

0.44

0.19

0.25

0.36

0.31

0

0.22

0.05

0.09

 FG4

0.09

0.09

0.06

0.05

0.07

0.11

0.13

0.19

0.07

0.13

0.40

0.39

0.26

0.35

 FG5

0.27

0.45

0.44

0.47

0.41

0.11

0.25

0.19

0.29

0.21

0.40

0.22

0.47

0.36

 FG6

0

0

0

0

0.00

0

0

0

0

0.00

0.10

0.06

0.11

0.09

 FG7

0

0

0

0

0.00

0

0

0

0

0.00

0

0

0

0.00

 FG8

0

0

0

0

0.00

0

0.06

0

0

0.02

0

0.06

0.05

0.04

  1. Legend for shore section according to Figs. 2 and 3