Table 3. Mean (±1SE) response values in control (C) and exclusion (E) treatments for all three reaches. Significantly larger values (P<.05) for each treatment pair indicated in bold.
| Chl a Biomass | Chl a Accrual | Periphyton AFDM | Invert Biomass | Invert Abundance | Leaf Decay | ||
| Reach | Treatment | (mg chl a·m−2) | (mg chl a·m−2·d−1) | (g AFDM·m−2) | (mg DM·m−2) | (# m−2 X100) | (d−1) |
| UP | C | 20.7(3.2) | 1.01(.16) | 79.2(20.5) | 932(97) | 29.2(2.4) | 0.211(.016) |
| E | 36.1(12.2) | 1.89(.73) | 88.4(18.1) | 613(179) | 17.1(2.3) | 0.073(.011) | |
| MID | C | 36.7(8.2) | 1.57(.40) | 73.9(9.4) | 721(78) | 28.9(5.4) | 0.087(.013) |
| E | 65.1(19.2) | 2.83(.93) | 155.9(40.6) | 526(114) | 24.9(6.5) | 0.082(.019) | |
| DOWN | C | 7.0(0.5) | 0.25(.01) | 16.3(2.5) | 493(171) | 8.2(1.3) | 0.133(.001) |
| E | 37.3(12.4) | 1.49(.62) | 50.2(8.0) | 599(177) | 8.5(1.7) | 0.109(.010) |
Chlorophyll a biomass and periphyton AFDM (ash-free dry mass) collected in week 3 for all reaches.
Invertebrate biomass and abundance collected after 4 weeks in upstream and midstream reaches, after 3 weeks in downstream reach.