(29) 



Reef Flot 



Reef Slope! I -IOm) 



Reef Slope (30-40m) 



(39) 



(30) 



CARRIE BOW 

 BELIZE 



LIGHTHOUSE 

 BELIZE 



BECERRO 

 HONDURAS 



® CARRIE BOW, BELIZE (24h) 



i pjpiNa sanctae-cbuos 



2 ACANTHOPHOBA SPEClFERA 



3 LAURENCIA INTRICATA 



4 HALIMEDA TUNA 



5 LIAGORA Sp. 



6 SABGASSUM POLfCEBATIUM 



7 5TYP0P0DIUM ZONALE 



8 CRYPTONEMIA CBENULATA 



9 HALIMEDA O ISCOIDEA 



10 HALIMEDA GOBEAUII 



11 BHIPOCEPHALUS PHOENIX 



12 L080PH0BA VABIEGATA 



D 



LIGHTHOUSE, BELIZE (I9h) 



1 LAUBENCIA PAPILLOSA 



2 PADINA SANCTAE-CBUCIS 



3 SABGASSUM POLrCE BATIUM 



4 DIGENIA SIMPLEX 



5 TUBBINABIA TBICOSTATA 



6 L080PH0BA VABIEGATA 



7 HALIMEDA COPIOSA 



8 GELIDIELLA ACEBOSA 



9 HALIMEDA TUNA 



10 HALIMEDA GOBEAUII 



11 HALIMEDA OPUNTIA 



12 BHIPOCEPHALUS PHOENIX 



INDIVIDUALS EATEN (%) 

 ) 20 40 60 80 100 



SIGNIFICANTLY 



DIFFERENT 



FROM 



1125) 

 (191 



1(10) 



^2(ii) 

 E3(iO) 



B3(37) 

 8(20) 



BliOl 



0i2O) 

 3(20) 

 H(i5) 

 3(19) 



20 40 60 80 100 



© BECERRO, HONDURAS (l.75h) 20 40 60 BO 



I ACANTHOPHOBA SPICIFEBA 



100 



LAUBENCIA PAPILLOSA 

 TUBBINABIA TRICOSTATA 

 HALIMEOA OISCOIDEA 

 HALIMEDA TUNA 

 PADINA Sp 



BHIPOCEPHALUS OBLONGUS 

 STTPOPODIUM 20NALE 



4-12 

 4-12 

 4-12 

 -3 

 -3 

 -3 

 -3 

 -3 

 -3 

 -3 

 -3 

 -3 



6- 



6 



6 



8 



8 

 1-3 

 1-3 

 1-5 

 1-5 



I 



12 

 12 

 12 

 12 

 12 



11,12 

 11,12 

 11,12 

 12 

 5 

 8 

 ■9 



REEF FLAT 



REEF SLOPE (I- IOm) 



, 2 

 . 2 



- 3 



- 3 

 -3 



1REEF SLOPE (30-40m) 



Fig. 1. The mean % of Thalassia eaten 

 in different habitats on the 3 study 

 reefs. Vertical lines represent + 2 

 standard errors. Numbers in parenthe- 

 ses = N. At each reef, all differences 

 are significant (p < .05, ANOVA and 

 Newman- Keuls Test). 



Fig. 2. Percentage of individuals eaten 

 when placed on the shallow reef slope. 

 For Carrie Bow, numbers in parentheses = 

 N. Significant differences (p < .05) were 

 evaluated using Contingency Table Analysis 

 or Fishers Exact Test (if cell sizes were 

 small ) . 



Susceptibility to herbivory of seaweeds from the shallow versus the deep 

 reef slopes showed no consistent pattern. At Carrie Bow (fig. 2A), there were 

 no significant differences between seaweeds from deep and shallow areas of the 

 reef slope (p < .05, Fishers Exact Test). At Lighthouse (fig. 2B), there were 

 some differences between species but these revealed no consistent between- 

 habitat patterns. 



For a given algal species, susceptibility to herbivory showed similar 

 patterns on different reefs (fig. 2). There were, however, a few interesting 

 exceptions. Acanthophora specifera , Laurencia papillosa , and Padina sanctae- 

 crucis were consumed rapidly on each reef where they were tested. Species of 

 Halimeda and Rhipocephalus were consistently resistant to herbivory, as was 

 Stypopodium zonale . Turbinaria tricostata was of intermediate preference. 

 Sargassum polyceratium from the reef flat on Lighthouse was very susceptible to 

 herbivory (fig. 2B); S^ polyceratium from the deep reef slope on Carrie Bow was 

 very resistant (fig. 2A). 



99 



