St. Croix Quantitative Data

Summary Data from Quantitative sampling - mussel density, mussel richness and sediment size. Click on the image for a larger size.

Mussel Density
Mussel Density
Mussel Richness
Mussel Richness
sediment size
Sediment Size
A map of locations can be found here.
An overview of the methods used to collect these data can be found
here.

Summary of Mussel Assemblages based on Quantitative sampling 1991-2009

Distribution of Mussels - % found at each site 

Dominant species - shaded blue
2nd most abundant species - shaded green

Species Bayport Franconia Interstate Lakeland Osceola  Prescott Riverside

Seven
Islands

Wild
River

Actinonaias ligamentina

0.33

5.58

5.84

0.64

4.19

0.42

58.16

65.99

35.74

Alasmidonta marginata

0.00

0.35

0.59

0.07

0.47

0.10

0.77

1.51

0.38

Amblema plicata

63.83

2.01

1.02

41.84

2.64

29.30

1.53

0.50

0.52

Cyclonaias tuberculata

0.00

1.05

2.10

0.14

0.47

0.00

2.04

1.51

3.79

Ellipsaria lineolata

0.00

0.35

2.23

0.99

0.16

0.21

0.00

0.00

0.00

Elliptio dilatata

3.06

4.36

2.65

9.12

1.24

6.47

22.70

12.59

24.35

Epioblasma triquetra

0.00

3.84

2.78

0.00

1.40

0.00

0.51

0.00

0.00

Fusconaia ebena

0.00

0.00

0.00

0.00

0.00

0.83

0.00

0.00

0.00

Fusconaia flava

13.33

6.11

4.27

15.05

18.76

19.60

3.83

0.50

1.81

Lampsilis cardium

0.11

3.05

0.89

0.78

1.09

3.02

1.79

6.05

2.45

Lampsilis higginsii

0.00

0.52

0.02

1.13

0.16

1.25

0.00

0.00

0.00

Lampsilis siliquoidea

0.55

1.13

0.17

0.35

0.00

1.36

1.28

0.50

3.29

Lasmigona complanata

0.00

0.09

0.09

0.07

0.62

0.21

0.00

0.00

0.05

Lasmigona compressa

0.00

0.00

0.04

0.00

0.00

0.00

0.26

0.00

0.02

Lasmigona costata

0.00

0.00

0.23

0.00

0.00

0.00

0.51

3.53

2.45

Leptodea fragilis

0.87

2.18

1.80

1.27

1.40

1.04

0.26

0.76

1.22

Ligumia recta

0.00

0.52

0.25

0.14

0.31

0.52

2.81

2.52

1.19

Megalonaias nervosa

0.00

0.00

0.00

0.14

0.00

0.00

0.00

0.00

0.00

Obliquaria reflexa

7.65

0.61

1.91

11.94

1.71

17.94

0.00

0.00

0.17

Obovaria olivaria

0.00

1.31

1.55

0.00

0.62

0.10

1.02

0.76

2.81

Pleurobema sintoxia

1.20

4.71

3.21

3.18

3.26

9.59

0.00

0.76

1.88

Potamilus alatus

0.98

1.22

0.87

0.99

2.17

0.42

0.00

0.00

1.12

Potamilus ohiensis

0.00

0.00

0.00

0.00

0.31

0.00

0.00

0.00

0.00

Pyganodon grandis

0.77

0.17

0.02

0.21

0.16

0.73

0.00

0.25

0.05

Quadrula fragosa

0.00

0.09

0.13

0.00

0.31

0.00

0.00

0.00

0.00

Quadrula metanevra

0.00

14.22

2.02

0.42

3.72

1.04

0.00

0.00

0.00

Quadrula pustulosa

4.37

2.97

6.73

3.75

5.12

2.71

1.53

1.51

8.15

Quadrula quadrula

0.33

0.09

0.02

0.78

0.16

0.10

0.00

0.00

0.00

Strophitus undulatus

0.22

0.35

0.13

0.35

0.93

0.10

0.00

0.50

1.12

Toxolasma parvus

0.33

0.09

0.19

0.14

0.00

1.46

0.51

0.00

0.05

Tritogonia verrucosa

0.00

2.36

2.65

0.07

6.98

0.00

0.00

0.00

0.00

Truncilla donaciformis

0.33

1.22

3.59

0.00

0.93

0.00

0.26

0.00

0.00

Truncilla truncata

1.09

37.43

51.50

5.94

40.78

1.04

0.00

0.25

6.89

UNKNOWN ADULT

0.22

0.26

0.11

0.07

0.00

0.00

0.26

0.00

0.14

UNKNOWN JUVENILE

0.11

1.75

0.40

0.21

0.00

0.10

0.00

0.00

0.31

Utterbackia imbecillis

0.33

0.00

0.00

0.21

0.00

0.31

0.00

0.00

0.05

Total number of mussels collected

915

1146

5289

1415

645

959

392

397

4197

Number of 0.25 m2 quadrats

500

700

820

400

500

500

500

200

700