Sevigny et al : Identification and distnbution of larvae or Sebastes fasaatus and S. mentella 



379 



among the three genotypes within and between sam- 

 pled areas and between years was tested with a 

 Kruskal-Walhs test. Nonparametric multiple com- 

 parisons (Dunn test) were used a posteriori to deter- 

 mine which genotypes had significantly different 

 sizes of larvae. Differences between genotypic pairs 

 were considered significant when P<0.05; the statis- 

 tics Q is thus not provided in our text. 



The relative proportion of S. mentella and of S. 

 fasciatus in the sampled larval population was esti- 

 mated by using two different approaches depending 

 on the taxonomic status of the heterozygous indi- 



viduals. With the first approach, the heterozygous 

 individuals were not taken into account and the con- 

 tribution of S. mentella and of S. fasciatus was based 

 on the frequencies of the genotypes MDWAlAl and 

 MDH'^A2A2, respectively. This approach yielded a 

 conservative estimate. With the second approach, the 

 heterozygous individuals were attributed to S. men- 

 tella. This procedure can be justified by the lack of 

 difference in the size distribution of the MDW'AIAI 

 and MDH'^A1A2 individuals and by the similar geo- 

 graphic distribution of these two genotypes (see "Re- 

 sults" and "Discussion" sections). 



