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Table 1 Overview of most important variables for each experimental date

From: Length- and weight-dependent clearance rates of juvenile mussels (Mytilus edulis) on various planktonic prey items

Year

Date

Temp (°C)

Phyto (×103 cells mL−1)

Treatment N

Control N

N mussels 100 L−1

Mean length (mm) ± SD

Clearance rate measured

Bacteria

Pico and nano

Ciliates

Mesocosm experiments

2010

21 June

18

7.9 ± 2.1

3

2

0.4

1.71 ± 0.72

 

ν

ν

5 July

21

36.5 ± 1.9

3

2

2.0

3.18 ± 2.08

 

ν

 

19 July

20

11.9 ± 2.2

3

2

1.2

4.60 ± 2.58

 

ν

 

3 August

19

52.5 ± 9.2

3

2

1.1

6.93 ± 2.17

 

ν

ν

21 September

15

2.3 ± 0.9

3

2

14

13.27 ± 4.42

  

ν

13 October

13

24.7 ± 2.8

3

2

11

15.32 ± 6.34

 

ν

 

2011

28 June

19

16.1 ± 0.6

3

2

5.3

8.15 ± 2.90

ν

ν

ν

12 July

19

32.4 ± 1.1

3

2

23

11.81 ± 4.27

ν

ν

ν

27 July

18

33.0 ± 0.6

2

2

13

13.49 ± 5.58

ν

ν

ν

9 August

15

42.7 ± 6.5

2

2

31

17.49 ± 7.18

ν

ν

ν

7 Septembera

16

14.1 ± 18.2

2

2

78

20.04 ± 6.00

ν

ν

ν

Laboratory experiments

2012

5 June

16

50.5 ± 17.2

2

2

0.3

3.17 ± 0.73

ν

ν

 

5 June

13

40.3 ± 13.1

2

2

0.2

1.48 ± 0.49

ν

ν

 

13 June

16

7.9 ± 0.7

2

2

1.0

4.60 ± 0.54

ν

ν

 

13 June

17

14.8 ± 7.9

2

2

0.7

3.06 ± 0.44

ν

ν

 

14 June

17

22.0 ± 0.8

2

2

0.2

2.14 ± 0.42

ν

ν

 

19 June

16

19.8 ± 12.6

2

2

1.0

4.96 ± 0.27

ν

ν

 

20 June

12

27.7 ± 21.2

2

2

1.3

6.57 ± 0.63

ν

ν

 

27 June

14

12.3 ± 0.8

2

2

1.0

4.20 ± 0.20

 

ν

 

27 June

15

12.6 ± 0.5

1

1

1.3

5.77 ± 0.23

 

ν

 

27 June

15

11.8 ± 0.9

1

1

1.3

7.16 ± 0.28

 

ν

 

28 June

15

11.9 ± 1.1

1

1

2.1

8.41 ± 0.24

 

ν

 

11 July

17

39.8 ± 0.8

1

1

2.5

7.40 ± 0.34

ν

ν

 

11 July

16

40.3 ± 2.0

1

1

2.5

10.61 ± 0.35

ν

ν

 

12 July

14

32.1 ± 1.7

2

2

3.3

12.03 ± 0.36

ν

ν

 

7 August

21

75.6 ± 4.2

1

1

3.6

13.48 ± 0.42

ν

ν

 

8 August

21

70.5 ± 3.5

2

2

7.1

15.03 ± 0.30

ν

ν

 

5 September

20

56.4 ± 1.4

1

1

10

20.20 ± 0.43

 

ν

 

5 September

20

49.5 ± 1.0

1

1

10

25.37 ± 0.30

 

ν

 

5 September

19

49.5 ± 2.1

4

4

10

25.52 ± 0.21

 

ν

 
  1. Temp is the average water temperature during the experiment, Phyto is the average number of phytoplankton cells (pico- and nanophytoplankton) as counted with the flow cytometer in 103 cell per millilitre, N treatment and N control give the number of mesocosms incubated with mussels or kept as control respectively. In 2012, an experiment was sometimes repeated with the same mussels using new sea water; this is than indicated by a two. On the last experimental date in 2012, the average of four separate experiments with four individual mussels is given. The number of mussels present per experiment is given as the number of mussels per 100 L of water (100 L−1). Mean length gives the average shell length in millimetres of the juvenile mussels used per experiment. The last three columns indicate whether clearance rates were measured for each particular prey item on each date
  2. aMussels originated from a different location than the artificial collector
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Helgoland Marine Research

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