Table 4.2: Dominant taxa, species richness (no. taxa), total faunal density (no. per 0.02 m²) and diversity (Shannon Weiner) at the 4 benthic monitoring stations in 1997. Percent of total fauna collected for that site/date combination is shown for common species.

Winter 1997 NCF6               Winter 1997 NAV               Winter 1997 M31                     Winter 1997 M54       

Species richness                  11            Species richness                  14          Species richness                     19      Species richness                17
Total Faunal density           3.3           Total Faunal density           155.11     Total Faunal density              26.2     Total Faunal density        29.55
Faunal diversity                  0.83          Faunal diversity                   0.33       Faunal diversity                      0.55    Faunal diversity                0.67 
  Common taxa:                                    Common taxa:                                   Common taxa:                                   Common taxa:
  Bivalvia sp.                       9.1             Procladius sp.                     5.4             Marenzellaria virdis           68.8         Oligochaete sp.            32.9   
  Chironomus sp.                 6.1             Oligochaete sp.                  82.7           Mediomastus californiensis 7.9           Marenzellaria virdis        9.2
  Procladius sp.                   9.1                                                                         Mediomastus spp.             11.3                        
  Oligochaete sp.                39.4                                                                                        
  Marenzellaria virdis          18.2                                                                                        

Spring 1997 NCF6                Spring 1997 NAV               Spring 1997 M31                     Spring 1997 M54   

Species richness                 28           Species richness                    26         Species richness                   14          Species richness             19
Total Faunal density           20.8         Total Faunal density           206.67     Total Faunal density             33.5         Total Faunal density     39.86
Faunal diversity                   1             Faunal diversity                   0.74        Faunal diversity                  0.92         Faunal diversity            0.94
Common taxa:                                   Common taxa:                                    Common taxa:                                    Common taxa:
  Bivalvia sp.                       6.3             Gastropoda sp.                   9.6            Marenzellaria virdis           25.1          Gammarus mucronatus  9.3
  Bivalvia sp. (juv)               5.3             Oligochaete sp.                  45.8           Mediomastus ambiseta     12.5           Gammarus palustris      30.5
  Oligochaete sp.               21.2             Tubificidae sp.                    26.9          Mediomastus californiensis7.8             Gammarus sp.                5 
  Marenzellaria virdis          36.1                                                                       Mediomastus spp.             25.4           Oligochaete sp.            8.6                                                                                                                        Parandalia sp.                     9              Mediomastus spp.      22.2

Sum 1997 NCF6                   Sum 1997 NAV                    Sum 1997 M31                          Sum 1997 M54     

Species richness                  4             Species richness                  5            Species richness                  14           Species richness                  12
Total Faunal density           5.5           Total Faunal density           237          Total Faunal density           54.5          Total Faunal density           25.5
Faunal diversity                   0.5           Faunal diversity                 0.07         Faunal diversity                  0.82         Faunal diversity                  0.94
Common taxa:                                    Common taxa:                                   Common taxa:                                    Common taxa:            
  Haustoriidae sp.                 18.2             Oligochaete sp.               97              Bivalvia sp.                       25.7           Bivalvia sp.                      7.8
 Procladius sp.                     9.1                                                                       Marenzellaria virdis          12.8           Cyclaspis pustulata          13.7 
  Oligochaete sp.                  18.2                                                                      Streblospio benedicti        36.7           Edotea montosa              9.8
  Marenzellaria virdis           54.5                                                                                                                                 Oligochaete sp.               7.8                                                                                                                                                                                 Eteone heteropoda         21.6
                                                                                                                                                                                Mediomastus ambiseta    9.8                                                                                                                                                                                 Mediomastus sp.           19.6

Fall 1997 NCF6                   Fall 1997 NAV                      Fall 1997 M31                             Fall 1997 M54    

Species richness                    5          Species richness                  5             Species richness                  20          Species richness                  9
Total Faunal density           4.75         Total Faunal density           68.4         Total Faunal density           56.8         Total Faunal density           25.4
Faunal diversity                  0.49         Faunal diversity                 0.05          Faunal diversity                 0.67         Faunal diversity                  0.36
Common taxa:                                   Common taxa:                                    Common taxa:                                  Common taxa:
   Gammarus sp.                  5.3             Oligochaete sp.             98.2             cumacean                      6.7             Mediomastus spp.             5.5
   Insect pupa                      5.3                                                                      Mediomastus spp.         15.1           Streblospio benedicti        81.9
   Isopoda sp.                     10.5                                                                    Streblospio benedicti     59.9                        
   Oligochaete sp.               15.8                                                                                     
   Marenzellaria virdis          63.2