Regression equations used to derive substrate areas from linear dimensions




Дата канвертавання26.04.2016
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S1. Regression equations used to derive substrate areas from linear dimensions.
Samples of Balanus crenatus and Serripes groenlandicus shells were used to provide regression equations:

SSer=0.8lSer2+15.91lSer-284.48, R2=0.91 (n=57),

SoutBcr=5.5lBcr2.1215, R2=0.87 (n=30),

where SSer is the area of the convex side of a Serripes shell, lSer is its length, SoutBcr is the area of the outer barnacle shell surface and lBcr is the aperture length of that shell. Live barnacles, in addition to their outer surface, provide sessile fauna with the surface of their movable plates, tergum and scutum, and small inner parts of all other plates. This area (hereafter SapertBcr) was estimated using the following equation:

SapertBcr=0.64lBcr2+0.37lBcr, R2=0.92 (n=30).

In addition to the outer surface, shells remaining from dead barnacles provide their relatively large inner surface for sessile organisms. The equation used to estimate their area was based on that for live barnacles:

SDBcr=11lDBcr2.1215,

where SDBcr is the area of the barnacle shell surface and lDBcr is the aperture length of that shell.



S2. Distribution of all sessile taxa by substrate type (larger circle) and by subtypes of primary substrate (smaller circle) in terms of the number of individuals. Pri – primary substrate; LB – shells of live barnacles; DB – empty barnacle shells; A – solitary ascidians; R – red algae; ? – substrate unknown.




S3. A table listing the frequency distribution of different epibenthic patches, obtained by combining each of the principal substrate types present


Substrate

Fraction, %

Pri

LB

DB

A

R










+

+

0.9







+







0.3







+

+




0.3







+

+

+

0.9




+




+

+

1.2




+

+







0.6




+

+




+

1.2




+

+

+




4.0




+

+

+

+

10.2

+













1.5

+







+




0.3

+




+







2.5

+




+

+




0.9

+




+

+

+

2.5

+

+










2.5

+

+







+

1.9

+

+




+




2.5

+

+




+

+

5.0

+

+

+







3.4

+

+

+




+

5.3

+

+

+

+




10.2

+

+

+

+

+

41.8



















Total, %




80.2

89.8

84.2

80.8

70.9



Pri – primary substrate; LB – shells of live barnacles; DB – empty barnacle shells; A – solitary ascidians; R – red algae; + stands for presence



S4. Dead:live ratios compared for Balanus crenatus from different substrates (2 on 2×2 tables).


Aperture length, mm

1

3

5

7

9

11

13

15

DB : Pri

*

ns

ns

ns

ns

ns

ns

ns

LB : Pri

***

***

***

***

**

***

ns

ns

LB : DB

***

***

ns

***

**

**

*

ns

Data collected in 2001–2005 was used. LB – shells of live barnacles; DB – empty barnacle shells; Pri – primary substrate. ns: not significantly different; * p<0.05; ** p<0.01; *** p<0.001.



S5. Dead:live ratio (S.E.) of Balanus crenatus on different substrates. Pri – primary substrate; LB – shells of live barnacles; DB – empty barnacle shells. Data collected in 2001–2005 was used.




S6. Effects of substrate type and location on individual mean weight in Styela rustica (ANOVA, type III sum of squares).


Source of variation

Effect type

d

SS

MS

F

P

Substrate (A, LB, DB)

Fixed

2

215.63

107.81

58.13

***

Site (1, 2)

Random

1

3.34

3.34

1.80

ns

Substrate × Site

Random

2

11.17

5.59

3.01

ns

Error




186

344.98

1.85






LB – shells of live barnacles; DB – empty barnacle shells; A – solitary ascidians. ns: not significantly different; * p<0.05; ** p<0.01; *** p<0.001.







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