Due to the experimental design we cannot rule out the confounding effects of attractants and
location (and potentially depth) and we thus refer to the effect of location as a nominal effect. We
could not discern an effect of attractants within locations where both attractants were used, but
this may also be an artefact of small sample sizes. Given that the locations differed quite markedly
in their physical characteristics (depth, water movement), it is not unreasonable to assume that
location may be influencing the assemblage composition, noting that location did not affect species
richness or abundance, a possible consequence of the overall low numbers of species and individuals.