highly significantp < 0.01
Nestedness was highly significant (p < 0.01) against nearly all null models, except null model B, which was shown to be excessively conservative [ 30 ].
Nestedness was highly significant (p < 0.01) against nearly all null models, except null model B, which was shown to be excessively conservative [ 30 ].
However, none of these factors significantly affected the total number of defence systems, although the effect of phylogroup approached significance (GLM: p = 0.06) ( Fig 2B ).