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Table 4.1
Mean abundance, (standard error), and percent of total abundance
for all common species at the NCF6 station, by year.
Common taxa are defined as those species comprising 3% or more of
the total abundance at a station on any given year. Percent abundance is given in parentheses.
Taxa
1996
mean (stderr)
Taxa
1997
mean (stderr)
Taxa
1998
mean (stderr)
Amphipod sp.(3.13%)
0.44(0.3)
Bivalvia sp.(9.96%)
1.02(0.31)
Chironomid sp.(6.90%)
0.52(0.42)
Gammarus
mucronatus(3.6%)
0.52(0.28)
Oligochaete sp.(22.88%)
2.38(0.98)
Polypedilum sp.(12.32%)
0.93(0.43)
Gammarus
palustris(8.24%)
1.16(0.71)
Marenzellaria virdis(36.53%)
3.81(1.33)
Procladius sp.(3.45%)
0.26(0.19)
Chironomid sp.(15.34%)
2.16(1.25)
Oligochaete
sp.(17.73%)
1.33(0.7)
Polypedilum
sp.(10.23%)
1.44(1.10)
Marenzellaria
virdis(17.24%) 1.3(0.59)
Procladius
sp.(9.38%)
1.32(0.54)
Polydora socialis(12.32%)
0.93(0.43)
Cyathura
sp.(5.11%)
0.72(0.29)
Spio pettiboneae(6.4%)
0.48(0.48)
Oligochaete sp.(13.64%)
1.92(0.52)
Marenzellaria
virdis(11.65%)
1.64(0.99)
Tanaidacea sp.(3.13)
0.44(0.25)
Taxa
1999
mean (stderr)
Taxa
2000
mean (stderr)
Gastropoda sp.(4.61%)
2.36(1.14)
Gastropoda sp.(11.0%)
1.8(0.89)
Insect pupa(12.32)
1.6(0.95)
Hydrobia sp.(4.59%)
0.75(0.45)
Oligochaete sp.(3.44%)
1.76(0.74)
Cladotanytarsus sp.(22.63)
3.7(1.96)
Boccardiella
sp A(47.54%)
24.32(23.87)
Coelotanypus sp.(3.06%)
0.5(0.4)
Polydora
socialis(16.81%)
8.6(7.55)
Polypedilum sp.(10.4%)
1.7(0.56)
Polydora
sp.(3.83%)
1.96(1.56)
Oligochaete sp.(3.67%)
0.6(0.34)
Tubificidae
sp.(5.5%)
0.9(0.44)
Marenzellaria virdis(6.12%)
1.0(0.43)
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