Interspecific density dependence
According to the AIC score, the optimal models for αCGand αGC were the GAM parametric term (G. f) model and
the GAM interaction model, respectively (Table 2). Among the
αCG candidate models, five had ΔAIC scores <
2, and among the αGC candidate models, one had a ΔAIC
score < 2 (Table 2).
Similar to intraspecific density dependence (Fig. 4c, d; Figs. S2, S3,
Supporting Information), the strength of interspecific density
dependence decreased as the intrinsic growth rate of each species
increased, whereas the intrinsic growth rate of the opposite species had
little effect (Fig. 4c, d). However, the intrinsic growth rate of the
opposite species exerted a slightly stronger effect than in the case of
intraspecific density dependence (Fig. 4c, d). For αGC,
the isoline interval decreased as rC increased
(Fig. 4d).