Secor et al ; Dispersal and growth of Acipenser oxyrinchus 



803 



Nanticoke River 



Chesapeake Bay 



5 



km 



Figure 2 



Map of Nanticoke River showing survey region, sites of release of yearling Atlantic sturgeon, and 

 river sections utilized for statistical analysis. On 7 July 1996, >3000 yearlings were released at rkm 

 36 and 50. Later in summer and fall smaller releases of yearlings fitted with ultrasonic devices 

 (Table 2 1 were made at rkm 13, 24, 36, and 50. 



bined into a single group for statistical analysis. Consis- 

 tency of mean trajectories and parallelism within and 

 among released fish groups was tested by using multiple 

 regression analysis, after modeling within-individual cor- 

 relations (repeated measures) through a spatial power 

 covariance model (Littel et al., 1996). Degrees of freedom 

 were adjusted using Satterthwaite's approximation. 



On the basis of upon multivariate analysis of available 

 water quality data, the Nanticoke River was divided into 

 three relatively homogeneous sections (Fig. 2): lower river: 

 rkm 8 to 19.9, middle river: rkm 20 to 33.9, and upper 

 river: rkm >34 (Table 3). Discriminate analysis indicated 

 that this classification resulted in consistent differences in 

 temperature, dissolved oxygen, and salinity records across 



