506 



Fishery Bulletin 104(4) 



Townsville regions were distinctly greater than those 

 of the Mackay and Storm Cay regions in 1995 <HSD, 

 P<0.05; Fig. 5A) and in Townsville were greater than 



6 



^ 1995 

 '-J 1999 



^ 



Lizard Island Townsville Mackay Storm Cay 



20 



1,5 

 HI 



en 

 « 1,0 



o 



> 



O 00 



CL 



§-(55 

 S 

 -1,0 



B 



1995 

 O 1999 



* 



^ 





^ 

 I 



T- CM — — — 



— .- — — CM 



Lizard Island Townsville 



Pi/lackay Storm Cay 



Figure 3 



Mean (A) principal component (PC) II scores per region 

 and cohort, and (B) PC IV scores per reef within region 

 and cohort of four-year-old common coral trout iPlectro- 

 pomuf; leopardus). collected from three reefs in each of 

 four regions in 1995 and 1999 on the Great Barrier Reef 



the Mackay and Storm Cay regions in 1999 (HSD, 

 P<0.05; Fig. 5B). 



Different combinations of harmonics 9, 114, 118 de- 

 scribing the finer details of the otolith shape, and har- 

 monic 124 and shape variables area and circularity 

 representing the broad details of otolith shape, were 

 selected into the DFs to maximize the separation of 

 cohorts within regions (Table 7). The primary predictor 

 variables selected for separating regions in each of the 

 cohorts were similar to those selected in the region-spe- 

 cific CDA, although the variables were not the same in 

 each cohort (Table 7). Between 66.79f and 76.3'7f of P. 

 leopardus within a region could be correctly classified 

 to their cohort of origin (Table 8). Fewer cohort specific 

 individuals could be classified to a region however; 



B 



m n 



DFI score 



Figure 4 



Frequencies of discriminant function (DF) I scores from 

 otolith morphological variables (Fourier harmonics and 

 shape variables combined) per cohort (sampled in 1995 

 and 1999) for regions (A) Lizard Island, (B) Towns- 

 ville, (C) Mackay, and (D) Storm Cay for four-year-old 

 common coral trout iPlectropomus leopardus), from the 

 Great Barrier Reef (The data were pooled across reefs 

 within regions.) 



