Appendix G. Comparison of prey consumption patterns.
TABLE G1. Comparison of prey consumption patterns between monocultures and the polyculture observed and expected consumption of all prey types at both high and low predator density. Proportional deviation from expected (%) is also shown (see Appendix C for calculation of these values).
Prey species |
P. ulyssiponensis |
P. ulyssiponensis |
M. edulis |
M. edulis |
L. littorea |
L. littorea |
G. umbilicalis |
G. umbilicalis |
Chthamalus spp. |
Prey size |
Small |
Large |
Small |
Large |
Small |
Large |
Small |
Large |
|
Expected (low density) |
0.003 |
0.011 |
0.018 |
0.006 |
0.004 |
0.009 |
0.0004 |
0.002 |
0.002 |
Expected (high density) |
0.002 |
0.009 |
0.010 |
0.014 |
0.002 |
0.005 |
0.0002 |
0.0005 |
0.002 |
Observed (low density) |
0.005 |
0.029 |
0.015 |
0 |
0.005 |
0.024 |
0.0004 |
0.004 |
0.001 |
Observed (high density) |
0.002 |
0.036 |
0.015 |
0.0143 |
0.002 |
0.013 |
0.0003 |
0.0007 |
0.001 |
Deviation (low density) |
0.002 |
0.018 |
-0.003 |
-0.006 |
0.002 |
0.015 |
-0.00003 |
0.002 |
-0.001 |
Deviation (high density) |
0.0006 |
0.027 |
0.004 |
0 |
0.001 |
0.008 |
0.00007 |
0.0001 |
-0.001 |
Percentage deviation (low density) |
63.6 |
157.1 |
-14.3 |
-100 |
43.5 |
160 |
-7.7 |
125 |
-45.7 |
Percentage deviation (high density) |
36.4 |
275 |
39.5 |
0 |
35 |
147 |
36.4 |
20 |
-55.8 |