Intraspecific density dependence
For both αCC and αGG, the combination
GAM was optimal (Table 2). Among the αGG candidate
models, two had ΔAIC scores < 2 (Table 2).
For both C. dalli and G. furcata , while the strength of
intraspecific density dependence decreased as their own intrinsic growth
rate increased, the intrinsic growth rate of the opposite species
exerted only a weak influence (Fig. 4a, b; Fig. S1, Supporting
Information). For both species, the strength of intraspecific density
dependence showed a similar trend in response to variations in the
intrinsic growth rate. For αCC, the isoline interval
decreased as rC increased (Fig. 4a), whereas for
αGG the isoline interval was nearly uniform and parallel
(Fig. 4b).