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Field Trip Writing Assignment Based on my observations in the field today, I became aware that there are a variety of species of insects which would serve as good “indicator species” for monitoring water or plant quality. Although I will not discuss all of these species, I will provide a short list of species which fit the criteria. These species include: ladybird beetles, aphids and alderflies. Aphids for example, are very abundant, and “in 1 acre there may be 200 million individuals on green parts of plants and a further 260 million underground on roots” (McGavin, 164). Based on these figures, it is quite evident that a significant reduction in the amount of aphids in a given area may present strong evidence supporting the idea that there is a lower plant quality. Additionally, another species, alderflies, are more important in