NOTE Abookiie et a\ Nedrsurface, daytime occurrence of two mesopelagic fishes in a glacial fjord 



379 



Northern lampfish and northern smoothtongue serve as 

 important Hnks in oceanic food webs (Cailliet and Ebel- 

 ing, 1990). Myctophids provide a high-lipid energy source 

 for a variety of predators (Van Pelt et al., 1997; Springer 

 et al., 1999). For example, stomachs of marbled murrelets 

 iBrachyramphiis marmoratus) collected at the entrance 

 to Glacier Bay contained northern lampfish almost exclu- 

 sively.'^ Black-legged kittiwakes {Rissa tridactyla), which 

 are restricted to foraging on fish at the surface, must feed 

 nocturnally to obtain northern lampfish at oceanic islands 

 in the Aleutians (Springer et al., 1996). However, near 

 Muir Glacier and other tide-water glaciers in Glacier Bay, 

 kittiwakes may be able to regularly forage on myctophids 

 during daylight hours. Further investigations of fish dis- 

 tributions and predator diets are necessary to understand 

 trophic interactions in Alaska's glacial fjords such as Gla- 

 cier Bay. 



Acknowledgments 



We thank Mayumi Arimitsu, Janene Driscoll, Captain 

 Mark Hottman, and the crew of the RV Pandalus for their 

 assistance during the cruise. Becka Seymour helped to 

 process fish samples, and Claire Armistead made Figure 1. 



Turbidity (FTU) 

 5 Id 15 20 



m 



m 

 » 

 m 



15 



-♦- Site I 

 • Site 2 



Figure 3. 



Vertical profiles of turbidity (FTU, formazine tur- 

 bidity units! at site 1 and site 2 from the surface 

 to 1.5 m depth. Black diamonds symbolize data 

 from site 1 and gray squares symbolize data from 

 site 2. 



2 Piatt, J. F. 1991. Unpubl. data. U.S. Geological Survey. 101 ! 

 E. Tudor Road, Anchorage, Alaska, 99503. 



We thank Greg Cailliet, Michael Litzow, James Orr, and 

 David Somerton for critical reviews of the manuscript. 

 This project was supported by U.S. Geological Survey 

 (USGS) Natural Resource Preservation Program (NRPP) 



