4 R. M. Anderson, J. B. Layzer, and M. E. Gordon 



species were represented by single specimens (which was not true 

 upstream), and at four downstream sites we found no live unionids. 

 Unlike the unionids, C. fluminea was found alive at all sites where it 

 had been previously reported, as well as at four additional sites 

 upstream. Data were not collected on other invertebrates or on fishes; 

 however, both were commonly observed throughout the stream. 



Our quantitative sampling also indicated that the mussel fauna 

 significantly declined between 1981 and 1987. Apparently there was an 

 almost complete kill of the unionid fauna at sites 8, 13, and 16 (Table 

 2). Ptychobranchus subtentum was the only unionid found alive in the 

 quantitative sampling; three specimens were collected at site 13. Between 

 1981 and 1987, the density of C. fluminea increased markedly at all 

 three sites. 



Table 1. Bivalves recorded from the Little South Fork Cumberland River in 1987. 



Stations 



Species 1 2 3 4 5 6 7 8 9 10 1 1 12 13 14 15 16 



Alasmidonta viridis (Rafinesque, 1820) R 



Villosa taeniata (Conrad, 1834) b 



Lampsilis fasciola Rafinesque, 1820 



Medionidus conradicus (Lea, 1834) 



Ptychobranchus fasciolaris (Rafinesque, 1820) 



Ptychobranchus subtentum (Say, 1825) 



Strophitus undulatus (Say, 1817) 



Villosa iris (Lea, 1829) 



Villosa trabalis (Conrad, 1834) 



Lasmigona costata (Rafinesque, 1820) 



Pleurobema oviforme (Conrad, 1834) 



Lampsilis cardia Rafinesque, 1820 



Toxolasma lividum (Rafinesque, 1831) 



Alasmidonta marginata Say, 1818 



Elliptio dilatata (Rafinesque, 1820) 



Leptodia fragilis (Rafinesque, 1820) 



Pegiasfabula(Lea, 1838) 



Obovaria subrotunda (Rafinesque, 1820) 



Proptera a/a/a (Say, 1817) 



Villosa lienosa (Conrad, 1834) 



Actinonaias ligamentina (Lamark, 1819) 



Actinonaias pectorosa (Conrad, 1834) 



Corbicula fluminea (Miller, 1774) 







R 



R 



R 



R 



L 



R 



L 



R*R 



R R*R 



L*R R 



L*R 





L 



R* * 



R R*R" 



<R*L R* 



R 





R 



R*R 



L*R 



L*R R * 



R 







L*R* 



R*L*R 



L*R R* * 



L 



R 



R 



L*R* 



R L*R 



L*R R R* 



* 







R 





R 



L R 



R 



L 



L 



R R R 



L*R R 



L L 



R 



R 



R* 



* R 



R R 



L 







L*R 



R*R* 



L*R* *R 





R 



R 



R 



R 



R*R 





R 



R* R 



L* R 



R * 







L 



R R 



R 



R*R 









R* 



* 



R R 









R R 



R L 



L*R R * 









R 



* * *R R 









R*R* 



R*R*R 



R*R*R * 









R*R 



*R R 



R*R R * 









R* 



R*R* *R*R R* * 









R 



* 

 R R 



L R 



L L 



L 



L 



L*L* 



L* L* L* 



L* L* L* L* 



a R = relic shells; L = live specimens observed; * - live specimens observed by Starnes and Bogan 

 (1982). Species listing is by first occurrence starting at the most upstream site. 



b Represents the form listed as Villosa taeniata punctata in Starnes and Bogan (1982). 



