3. Results
3.1. Sediment properties
Day 0 sediment properties were significantly different between the
two sites (t-tests, p b 0.05), and these inter-site differences persisted
throughout the experiment (Table 1). Sediments at site 2 were
characterised by a lower median grain size (131 vs. 198 μm), but a
mud (b63 μm), pigment (chl a and phaeo) and OM content approxi-
mately 2 times higher than at site 1.
At both sites, sediment properties were unaffected by the addition of
detritus (repeated measures ANOVA, treatment effect p N 0.05), but
properties did vary temporally (time effect p b 0.05). Although statisti-
cally significant, the sediment properties at each site did not vary sub-
stantially during the experiment, as indicated by the narrow range of
treatment means (Table 1).
Even though sediment properties did not differ with treatment, we
did detect a difference in the amount of detritus (N500 μm) between
DA and control plots at both sites, which persisted for the duration of
the experiment (Fig. 1). Two weeks after the addition, the detritus in
DA plots was 8–9 times higher than that in ambient sediment measured
on day 0, and by the end of the experiment (week 24) there was still
marginally significant higher levels of detritus in DA than in control sed-
iments at both sites 1 and 2 (t-test, p = 0.02 and 0.1, respectively). The
decline in detritus from DA plots as the experiment progressed through
time was probably associated with losses due to decay and/or tidal
transport (Fig. 1)
3. Results3.1. Sediment propertiesDay 0 sediment properties were significantly different between thetwo sites (t-tests, p b 0.05), and these inter-site differences persistedthroughout the experiment (Table 1). Sediments at site 2 werecharacterised by a lower median grain size (131 vs. 198 μm), but amud (b63 μm), pigment (chl a and phaeo) and OM content approxi-mately 2 times higher than at site 1.At both sites, sediment properties were unaffected by the addition ofdetritus (repeated measures ANOVA, treatment effect p N 0.05), butproperties did vary temporally (time effect p b 0.05). Although statisti-cally significant, the sediment properties at each site did not vary sub-stantially during the experiment, as indicated by the narrow range oftreatment means (Table 1).Even though sediment properties did not differ with treatment, wedid detect a difference in the amount of detritus (N500 μm) betweenDA and control plots at both sites, which persisted for the duration ofthe experiment (Fig. 1). Two weeks after the addition, the detritus inDA plots was 8–9 times higher than that in ambient sediment measuredon day 0, and by the end of the experiment (week 24) there was stillmarginally significant higher levels of detritus in DA than in control sed-iments at both sites 1 and 2 (t-test, p = 0.02 and 0.1, respectively). Thedecline in detritus from DA plots as the experiment progressed throughเวลาอาจเกี่ยวข้องกับการขาดทุนเนื่อง จากการผุ หรือบ่าขนส่ง (Fig. 1)
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