Auth et al : DIel variation in vertical distribution of an offshore ichtfiyoplankton community 



325 



determine the underlying causes of the DVM of larval 

 fish, it does provide some evidence for type-I DVM (up 

 at night, down during the day) for S. leucopsarus and 

 Sebastes spp. larvae (and to a lesser extent for L. exilis 

 larvae), and type-II DVM (down at night, up during the 

 day) for T. crenula?-is larvae (Fig. 3). Evidence for either 

 type of DVM for larval Sebastes spp. has not been found 

 in previous studies (Sakuma et al., 1999; Bjorkstedt 

 et al, 2002). This new type-I DVM could help explain 

 the retention of Sebastes spp. larvae close to settlement 

 areas along and inshore from the shelf as observed by 

 Auth and Brodeur (2006) — a retention that is due to 

 the ability of larvae to regulate their position in the 

 water column and to take advantage of selective Ekman 

 transport (Sakuma and Larson, 1995). 



Acknowledgments 



We thank the captains and crews of all research vessels 

 participating in this study for their cooperation and 

 assistance in the sampling. Collection of all MOCNESS 

 tows discussed in this paper was made possible through 

 two grants to W. Peterson from the U. S, GLOBEC 

 program (NA 67RJ10151 and NA 86OP0589). We are 

 indebted to the Peterson Zooplankton Group for their 

 efforts in collecting data at sea and for archiving the 

 samples. In this regard, special thanks to J. Keister, 

 M. Vance, L. Feinberg, T. Shaw, J. Lamb, A. Roestad, 

 and D. Swenson. We also thank M. Busby, D. Blood, 

 and A. Matarese of the Alaska Fisheries Science Center 

 Recruitment Studies Program for their help in identify- 

 ing eggs and larvae. We thank G. Boehlert, B. Mundy, 

 A. Moles, and three anonymous reviewers for critical 

 reviews of the manuscript. Funding was provided by 

 NOAAs Stock Assessment Improvement Program, Fish- 

 eries and the Environment Initiative, and the Northeast 

 Pacific GLOBEC Program. This is contribution number 

 512 of the U.S. GLOBEC Program. 



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