Consumption (mean ±1SE) of confamilial pairs of native vs exotic macrophytes by five herbivore species: (a) <i>P. spiculifer</i>, (b) <i>P. canaliculata</i>, (c) <i>P. insularum</i>, (d) <i>P. haustrum</i>, and (e) <i>P. paludosa</i>.

2013-02-20T20:08:25Z (GMT) by Wendy E. Morrison Mark E. Hay
<p>The sloping line in each figure represents the 50∶50 distribution expected if there is no preference for native versus exotic plants. The filled-in symbols indicate significant preference for one plant in that pair. Inset histograms show the mean consumption across exotic and native plant pairings. P-values from two-tailed paired T-tests are for the pooled histogram data. The triangles present in a) and e) represent comparisons including <i>Ludwigia grandiflora</i> and <i>Pistia stratiotes</i>, plants whose native distribution is in question. P-values for these two graphs are provided with (N = 9) and without (N = 7) these two data points. The a and b's designate comparisons from the North American and South American perspective, respectively.</p>