|Figure 1: Here is the original graph when simply plotting out the length of the arthropod larvae to its biomass. Though some details escape the plot, there are 3 points on this graph that show a different type of larvae (dark red circles).|
|Figure 2: After doing a log transform, this is what the data looks like; much data pertaining to body size are non-linear. There is now more of a distinction between the two types of arthropod larvae.|
|Figure 3: Voila! These fit lines better help illustrate the relationship of each type of larvae length to biomass.|
It might be more presumable to think that this is due to bird predation because the larger these larvae are, the more conspicuous it is on the sagebrush leaves. This leads to the possible conclusion that there could a top-down effect on the arthropod community, but only on the larvae in the earlier months, and not necessarily on the mature arthropods that appear closer to summer. Maybe the earlier hypothesis that I came up with should also include a comparison of temporal variation of herbivory; it would be interesting to see if the data changes at different times of the year.
1. Sage, R.D. 1982. “Wet and Dry-weight Estimates of Insects and Spiders Based on Length.” American Midland Naturalist 108(2): 407-411.2. Saint-Germain, M; Buddle, C.M.; Larrivee, M; et al. 2007. “Should Biomass be considered more frequently as a currency in terrestrial arthropod community analyses?” Journal of Applied Ecology 44: 330-339.