Figure 2. Plant and arthropod responses to nutrient manipulations.

Effects of press (solid line) and pulse (dashed line) treatments on Spartina %N (A, B), Spartina live biomass density (C, D), density of Prokelisia planthoppers (E, F), density of the predatory mirid Tytthus (G, H), and density of the top intraguild predator Pardosa (I, J) (results from CHNS on left, TUCK on right; means ±se). Effect means within gray bands were not significantly different from zero, meaning that treatment and control values did not differ. Asterisks indicate that pulse and press treatments had significantly different effects in a given year (α. = 0.05). Asterisks are displayed only when the year by treatment interaction was significant. See methods for information on how treatment effects were calculated.