194 HUMMON et al. 



sediment, and the interstitial-water values were multiplied by the 

 decimal fraction of remaining abundance. Noncarbonate conduc- 

 tivity is given in micro mhos per centimeter, and oxygen saturation is 

 given as a decimal fraction, rather than as percent. The third 

 parameter is the cube root of cubic decimeters of stresim flow per 

 second, or decimeters per second. 



In an alternate way of viewing meiofaunal relationships between 

 sites, the H' (Lloyd, Zar, and Karr, 1968) taxon diversity was 

 calculated for the arithmetic aggregate of station abundances at each 

 site. It is proper to use the H' diversity measure with respect to taxa 

 so long as (1) the results are compared with those of other studies 

 using the same taxa and sampling— analytic scheme and (2) no 

 inferences are made with respect to H' generic or species diversity. 

 Faunal abundances from all 14 sites were then subjected to an Sh' 

 similarity analysis (Hummon, 1974), based on shared taxon diversity, 

 and the results were assembled in a dendrogram using the unweighted 

 mean, pair— group method. 



RESULTS 



Values for pH were lowest at Raccoon Creek and Sandy Run, the 

 two streams most heavily polluted by acid mine effluents (Table 2). 

 In both streams the lower site showed slightly moderated effects of 

 mine acid. Minkers Run was the only other stream having pH values 

 consistently below 7.0, with the lower site in this case showing 

 slightly increased effects of mine acid, probably associated with the 

 nearby tipple zone. Interstitial waters generally showed slightly 

 lower pH values than the adjacent stream waters, the major 

 exception being Sandy Run (upper site) where interstitial water was 

 higher than stream water. 



Total conductivity was greatest at Raccoon Creek and least at 

 Tick Ridge, which lay just below the recently stripped and reclaimed 

 area (Table 2). Intermediate values, in descending order, were Minkers 

 Run, Sandy Run (upper site). Long Run, Strouds Run, Sandy Run 

 (lower site), and Margaret Creek. Total conductivity of interstitial 

 waters was similar to or lower than that of stream waters, the trend 

 being most accentuated at Sandy Run (lower site), but with major 

 reversals at Minkers Run cind Margaret Creek (south site). Carbonate 

 conductivity was absent or minimal at Raccoon Creek, Sandy Run, 

 and Minkers Run (lower site), low at Tick Ridge and in the stream 

 water at Minkers Run (upper site), and high in the interstitial water 

 at Margaret Creek (south site). Other stream sites had intermediate 



