Bromaghin et al: Diets of Phoca vitulma in the Salish Sea revealed by analysis of fatty acid signatures 
19 
Figure 2 
Mean diet composition estimates: (A) adjusted and (B) unadjusted for differential fat 
mass among prey classes, for all harbor seals (Phoca vitulina) combined in our inves- 
tigation of the diet composition of harbor seals in the Salish Sea. Error bars are ±1 
standard error of the estimate. Prey classes are defined as B&YR (Black [ Sebastes 
melanops ) and Yellowtail [S. flavidus ] Rockfish), CR (Copper Rockfish [S. caurinus]), 
PSR (Puget Sound Rockfish [S. emphaeus 1), Chin (mature Chinook Salmon \Oncorhyn- 
chus tshawytscha]), Chum (mature Chum Salmon 10. keta}), Coho (mature Coho Salmon 
(O. kisutch ]), Sock (mature Sockeye Salmon [O. nerka J), Pink (mature Pink Salmon 
10. gorbuscha]), Sal-M (medium-size Chinook and Coho Salmon), Sal-S (small Chinook, 
Chum, Sockeye, and Pink Salmon), Pol (Walleye Pollock [ Theragra chalcogramma 1), Her 
(Pacific Herring [ Clupea pallasii 1 at least 2 years old), YH&SL (Pacific Herring less 
than 2 years old and Pacific Sand Lance [ AmmocLytes hexapterus]), NA (Northern An- 
chovy [Engraulis mordax ]), SP (Shiner Perch [ Cymatogaster aggregata]), PM (Plainfin 
Midshipman | Porichthys notatus ]), SD (Spiny Dogfish [Squalus acanthias]), OIS (Opal- 
escent Inshore Squid [ Loligo opalescens]), G&S&F (Kelp Greenling [ Hexagrammos 
decagrammus] , Pacific Staghorn Sculpin [Leptocottus armatus 1, and Starry Flounder 
[Platichthys stellatus]). 
