Competitive reshuffling
In W plots, where we observed competitive reshuffling, competitive
effects strongly increased for the dominant species, mostly driven by
the subdominant species group (Fig 3, S8, Table S3). This enhanced
competitive pressure on the dominant species was not present in any
other global change treatment (Fig 3, Table S3). Competitive effects
also increased on the subdominant species, driven by enhanced
competition from the moderate species group (Fig 3, S8, , Table S3).
Predictive steady-state distributions show that this was likely driven
by competition for ambient N, as both moderate and subdominant species
respond positively to ambient N in W plots (Fig 2). Thus at higher
levels of ambient N, the subdominant species are outcompeted by the
moderate species (Fig 4). Finally, net competition weakened slightly in
W plots for rare species (Fig 3, Table S3), via reduced competition from
the dominant species (Fig S8), consistent with the increase of rare
species in these plots over time.