Food Preference of Algivorous Invertebrates — Leighton 
107 
Aplysia califormca 
E gr e g i a 
47 2 
Macrocystis 40.3 
Gigartina 
34 3 
\ 
E i s enia 2 8 
.9 
\ 
Pterygophoro 
8.2 
Laminaria 
2.7 
C ys toseira 
1.6 
WSD =: 21.2 
A s t r a e a 
undosa 
M acrocys tis 
6 1.2 
Gigartina 
50.8 
E gregia 
48.2 
\ 
Laminaria 
35 0 
E isenia 
20.6 
Cystoseira 30 
Pterygophoro 0.9 
WSD * 1 21.4 
Halictis corrugata 
Macrocystis 
688 
E gre g io 
55.0 
E i s enia 
52 8 
Laminaria 
50.9 
Pter y gophora 
47.2 
\ 
Cystoseira 

27.1 
Gigarti n a 
22 
WSD = ! 2 9.7 
Haliot is fulgens 
Egregla 
I 2 7.9 
Macrocystis 
97 8 
WSD = 
E isenia 
62.6 
Laminaria 
58.2 
Gigarti n a 
57.7 
Cys toseira 
38.4 
Pterygophoro 
34.9 
4 8.3 
Haliotis rufescens 
Macrocystis 
" \ 
E g r e g i a 
Lominaria 
160.5 
I 10.9 
107 9 
\ 
E isenia 
91 
\ 
Gigartina 71.8 
Pterygophoro 43.4 
\ 
Lytechmus anamesus 
Cystoseira 
27 9 
WSD = ! 58.8 
WSD 
I 4.7 
Fig. 1. Differences in amounts of various algae consumed by invertebrate grazers. Species in boxes are not 
significantly different (.05 level) from each other, but do differ from those in preceding or following boxes. 
Intermediates are not boxed. Algae are arranged from top to bottom in order of decreasing preference. WSD, 
the wholly significant difference, is the minimum difference between species which would be significant at the 
5% level (see Tukey, 1953). 
