192 
Fishery Bulletin 109(2) 
2“ 
1 - 
CM 
< 
O 
o 0 . 
PTC**BTP 
PHR* : 
SIP* 
BFE 
m • 
WBP* SL ^ *WEP 
SPg| 480 m 
PIP* 
PFP* 
BRF, 
SHP* 
*QRF 
*BBE 
#SPDs 
20 m pc^ m 
en!^ t G > NS ' 
RKS^^SFS 
COS^SPS 
DOV 
•REX 
LNS 
RAT **phk 
160 m 
SAS* 
GRS 
-3 
-1 0 1 
CCA 1 (4.9%) 
CCA 1 (43.6%) 
CCA 1 (6.7%) 
Figure 4 
Species-based partial canonical correspondence analysis (CCA) tri-plots for fall+summer and all-seasons 
analyses in which depth (A, B) and season (C, D) are the constraining variables, respectively. In the 
tri-plots, the site centroids coded for each constraining factor are indicated by triangles. The proxim- 
ity of factor centroids in ordination space to one another corresponds to their respective similarity in 
average species composition. Species that have strong loadings (large eigenvectors) are distant from 
the tri-plot origin and contribute the most to differentiating factor centroids that separate along the 
same axis. The eigenvalue or variance associated with each axis is indicated by parentheses. In cases 
were the constraining factor consisted of only two groups as in (B) and (C) only one CCA axis was 
generated. To aid interpretation two dimensional plots were generated by plotting the CCA (x-axis) 
against the residual axis (y-axis) derived from standard correspondence analysis (CA) performed 
on the remaining community variance. Species codes: BFE = bigfin eelpout ( Lycodes cortezianus)\ 
BBE=blackbelly eelpout (Lycodes pacificus)', BTP=blacktip poacher ( Xeneretmus latifrons)', BRF=brown 
rockfish ( Sebastes auriculatus ); C0S = C-0 sole (Pleuronichthys coenosus)', DOV=Dover sole ( Micros - 
tomus pacificus ); ENS1 and ENSs for English sole ( Parophrys vetulus) large and small, respectively; 
GRS=breat sculpin ( Myoxocephalus polyaca n thoceph alus); LNS=longnose skate (Raja rhino ); PHK=Pacific 
hake (Merluccius productus ); PHR = Pacific herring ( Clupea pallasii pallasii ); PSD = Pacific sanddab 
(Citharichthys sordidus)\ PTC = Pacific tomcod (Microgadus proximus)', PIP=pile perch (Rhacochilus 
vacca)\ PFP=plainfin midshipman (Porichthys notatus ); QRF=quillback rockfish ( Sebastes maliger ); 
REX=rex sole (Glyptocephalus zachirus ); RKS=rock sole (Lepidopsetta bilineata); RBS=roughback 
sculpin (Chitonotus pugetensis)\ SAS = sand sole ( Psettichthys melanostictus); RAT=spotted ratfish 
(Hydrolagus colliei ); SGP=sturgeon poacher ( Podothecus accipenserinus ); SFS = sailfin sculpin (Nautich- 
thys oculofasciatus ); SIP=shiner perch (Cymatogaster aggregata)\ SLS = slender sole (Lyopsetta exilis)', 
SPS = speckled sanddab (Citharichthys stigmaeus ); SPD1 and SPDs = spiny dogfish (Squalus acanthias) 
large and small, respectively; SHP=staghorn sculpin ( Leptocottus armatus ); WEP=walleye pollock 
( Theragra chalcogramma ); WBP=whitebarred prickleback ( Poroclinus rothrocki). 
