Choat et al.: Comparison of ichthyoplankton sampling methods 



203 



3000 



• Goblldaa 



O Apogonldae 



 Lutjanldaa 160 



A Labrldae 



140 



CO 



+l 



E 

 o 

 o 

 o 



DC 

 LU 



Q_ 



CO 

 LL. 



m 



2 



2000 



1000 



• Pomacentrldae 

 O Lethrlnldae 

  Atherlnldaa 

 ▲ Mullldae 



Bongo Purse Seine Neuston Tucker Trawl Bongo 



NET TYPE 



Purse Seine 



Neuston Tucker Trawl 



Figure 5 



Mean densities of eight selected families (see Materials and methods! collected by four different net types on the nights of 3, 5, and 6 

 December 1986 off Lizard Island, Great Barrier Reef. 



Table 5 



Multivariate analysis of variance of density data for apogonids, 

 atherinids, gobiids, lethrinids, mullids, and pomacentrids (see 

 Materials and methods) from off Lizard Island, Great Barrier 

 Reef. Factors include sampling methods (purse-seine, bongo 

 net, neuston net, Tucker trawl) and nights (3, 5, and 6 

 December 1986). Data are ln(x+l) transformed. Test statistic 

 used is Pillai's trace. Significance levels: **0.01>p>0.001; 

 ***p<0.001. 



Source 



F 



Numerator 

 df 



Denominator 

 df 



Method 

 Night 

 Method < Night 



11.53 

 4.05 

 1.65 



18 

 12 

 36 



Z.A *** 



186 ** 



dominant families; neuston, by higher numbers of 

 atherinids, a neustonic group. The significant interac- 

 tion is attributable largely to the purse-seine result. 



