FISHERY BULLETIN: VOL. 86, NO. 2 



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GASTRO* OSTRA 



AMPHI 



ISO 



DECA ECHINO* 



Figure 2. — Abundances (x ± 1 SE) of the six most common prey found in algal clumps at 

 the silted No Name Key and unsilted Burnt Point sites. Five clumps were collected at each 

 site. Values are standardized by clump volume. Asterisks denote significant difference in 

 Bonferroni multiple comparison tests (P = 0.051. Abbreviation key: GASTROpod, OSTRAcod, 

 AMPHlpod, isopod, DECApod, ECHlNOderm. 



Table 3. — Two-way fixed-effects ANOVA testing for differences in 

 the total number of individuals among six prey categones (see 

 Table 1) at two sites, one silted (No Name Key) and one unsilted 

 (Burnt Point). Data were log transformed. 



Source 



df 



SS 



Site 1 0.841 18.78 0.001 



Prey type 5 6 242 27.89 0.001 



Site X prey type 5 0.847 3.78 0.006 



Error 48 2.149 



(Marx and Herrnkind 1985b; Herrnkind and But- 

 ler 1986), 2) most spiny lobsters recovered from 

 open sand were actually in corners, indicating 

 edge-seeking behavior rather than selection for 

 sand per se, and 3) only 10.6% of 142 spiny lob- 

 sters tested were found on sand even though it 

 constituted 68% of the exposed substrate in 

 aquaria. Silt had no effect on puerulus survival 

 through metamorphosis to the first benthic instar 

 (13% vs. 9% mortality in silted and unsilted 

 algae, respectively), or time-to-metamorphosis 

 (Fig. 3; t = 0.37, P > 0.05). 



The total number of prey items consumed in the 

 juvenile prey selection experiments ranged from 

 19 to 57 prey per lobster per 12 hours. Juveniles 

 fed randomly from the three different prey combi- 

 nations and frequencies offered to them (Table 1). 



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DAYS 



FlGt_iRE 3. — Cumulative number of spiny lobster postlarvae 

 metamorphosing as a function of time in one of two treatments: 

 silted algae (Laurencia spp.) or unsilted algae. Twenty-three 

 postlarvae were tested in each treatment; two postlarvae died in 

 the unsilted treatment and three in the silted treatment. 



DISCUSSION 



The relative paucity of newly settled spiny lob- 

 sters in the heavily silted region around No Name 

 Key over a 3-yr period indicates that low recruit- 

 ment to benthic habitat is typical there. The ab- 

 sence of juveniles was apparently not due to a 



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