C A = i=1 



• s 



2 j; (ai) (bi) 



where A and B are the total number of individuals in samples from communities 1 

 and 2, respectively, and a^ and bj^ are the number of individuals in each 

 species present in samples from communities 1 and 2, respectively. CA varies 

 from zero when the communities are completely distinct (containing no species 

 in common) to unity vrtien the ccanmunities are identical in proportional species 

 composition. 



In comparing the communities, the values of CA were considered to 

 indicate the following: values below 0.500 indicated the communities were 

 dissimilar; values from 0.500 through 0.749 indicated that the communities were 

 similar; and values from 0.750 through 0.99 indicated that the communities were 

 highly similar. 



7. Fish . 



Fish were sampled with a 4 6-meter- long, 2 .4-meter-deep beach seine (0.6- 

 centimeter mesh, stretched measure) and 43-meter-long, 1 .8-meter-deep graded 

 mesh gillnets, each constructed of seven 6-meter-long panels of gillnet mesh 

 (one panel each of 2.5-, 3.8-, 5.1-, 6.3-, 7.6-, 10. 1-, and 12.7-centimeter 

 mesh, stretched measure) joined end-to-end. One seine haul was made at night 

 at station 1 on transects I, IV, and VI during each sampling period. The seine 

 haul was accomplished by anchoring one end of the net on the beach, setting the 

 remainder of the net by boat in a semicircle extending from the beach out into 

 the lake and back to the beach, and then pulling the entire net onto the beach. 

 One gillnet was set overnight, perpendicular to the shoreline at stations 3 and 

 4 on transects I, IV, and VI. All fish collected in seines and gillnets were 

 identified, weighed to the nearest gram, and measured to the nearest 

 millimeter. 



The fish sampling was designed to indicate the changes in the abundance of 

 the major commercial, sport, and forage fish species throughout the study area 

 that might have occurred as a result of the beach nourishment activities. Fish 

 catch data were compared among transects. 



III. RESULTS 



1. Beach Face Profile. 



Aerial photographs of the shoreline in the vicinity of the Lexington 

 Harbor (Figs. 3 to 5) show that the beach face profile changed markedly during 

 the study. On 16 June 1980 the beach face in area A (accretion area) was lo- 

 cated about 1 5 meters lakeward of the west end of the harbor's north breakwater 

 (Fig. 3); the beach in this area, as measured to the tree line, was about 90 

 meters wide. In areas B and C the beach face was located within 15 meters of 

 the tree line except at the north end of area B where the maximum width of the 

 beach was about 30 meters. Several groins, piers, and docks, some extending 

 15 meters or more into the leike beyond the beach face, were visible in areas B 

 and C. 



15 



