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<br />5.2.4 Station Comparisons <br />Table 5-3 shows the total number of species found in major in- <br />• <br />vertuate groupings by station for the three collection periods. <br />Table 5- 2 provides further detail on three insect groups by particular <br />species presence or absence at the four stations on the North Fork. <br />These data show a definite difference between stations in the study <br />area for particular species. For the caddisflies, stations 11F'-1 & 2 were <br />very similar for all the sampling periods, but were quite different from <br />the doxnstrea~ stations NF'- 3 &4. There were far fewer caddisfly species <br />at the lower stations, rdth several species never being recorded at any of <br />the 3 sampling periods. In the March sample no caddisfly species were <br />recorded for Station t1F'-3. Betxeen stations NF 3 & 4, the lower station <br />(below the mouth of Stevens Gulch Creek) had more species than the station <br />just above the mouth ir. October & March, and the same number (one) in July, <br />In fact no caddis.°lles were found ~t St:_tion NN'-3 in October or March <br />indicating poor conditionsfor caddisflles ir. this loxes area. <br />In terms of numbers of species of chironomids found, there xas a <br />u <br />tendency for fewer species at upstream stations (especially at control <br />Station NF-1) compared to the loxes stations, This trend xas especially <br />marked ir. the October samples when there were 4 & 6 species identified up- <br />stream vs. 14 & 8 species doxnstrea~. Over the whole year (three sample <br />periods) there were '] & 9 species identified from stations NF 1 & 2 com- <br />pared to i5 ~ 12 species at NF-3 & 4, 'rlhen chironomid species are sub- <br />tracted from the total number or species found in the four. sampling areas, <br />they. the lower two stations (h:~'-3 &-4) show marked fewer species in ';arch, <br />2~ & 29 vs. 12 & 20, although ir. the GC lobes & July reriods the numbe_ of <br />5-O <br />