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RESULTS<br />

Species abundances - Table 5.1 shows the mean number of species, individuals and<br />

Shannon-Wiener diversity index values for the non-weed and weed plots. After 4<br />

weeks of algal cover, the total number of individuals and diversity significantly<br />

increased in the weed plots while there was no change in the mean number of species.<br />

There was no change in the total number of species: a total of 17 species were<br />

obtained from the 6 replicates for both the weed and non-weed plots, 10 being<br />

sufficiently abundant for statistical analysis.<br />

The invertebrate abundances for the 4 weeks and 20 weeks samples together with their<br />

standard errors are shown in Figures 5.2(i) and (ii) respectively. Eight of the 10<br />

species sufficiently abundant for statistical analysis after 4 weeks showed significant<br />

differences in abundance between the two plot types, all being more abundant in the<br />

weed plots compared to the non-weed plots (P. elegans, p=0.012; C. capitata,<br />

p

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