Ecological Archives E086-025-A9

James E. Byers. 2005. Marine reserves enhance abundance but not competitive impacts of a harvested nonindigenous species. Ecology 86:487–500.

Appendix I. A table showing the number of clams (Venerupis philippinarum and Protothaca staminea) eaten by each replicate adult red rock crab, Cancer productus, in prey choice trials.

Crab (No.)
Crab size (mm)
Crab sex
Elapsed time (d)
No. trials (No. clams eaten)
Venerupis philippinarum
Protothaca staminea
1
155
f
34
12
8
4
1.33
2
158
f
48
15
10
5
1.67
3
160
f
33
16
13
3
6.25*
4
145
m
36
18
10
8
0.22
5
148
f
13
13
7
6
0.077
6
145
f
22
16
10
6

1

7
142
f
12
12
7
5
0.33
8
160
f
52
12
8
4
1.33
9
141
m
40
14
7
7

0

10
135
m
31
13
8
5
0.69
   
 
 
 
 
 

Total , df =10

 
 
 
12.91

Pooled , df = 1

141
88
53
8.69

Heterogeneity , df = 9

 
4.22ns

a = 0.05, df = 9 = 16.92      

   

Therefore, pooling justified.  Pooled C2 = 8.20**, df =1

   
 

Overall Proportion Selected

0.624
0.376
 

   Notes: Crab size is maximum carapace width in mm. Elapsed time is the number of days each crab took to eat the total number of clams documented.

* P <0.05; ** P < 0.005; ns not significant



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