Copepod density: Results of model selection for copepod spp. abundance in ecosystems with grazers and with grazers and predators.

We used linear regressions (Methods: Statistical analysis). Models included terms for weekly average temperature (Twj), ecosystem trophic treatment (Zj) and their interaction, and a random effect for ecosystem identity. We compared models using likelihood ratios (LogLik), AICC, Akaike weights (w), and δAICC weights. We modeled 120 observations in 20 groups (10 AGP ecosystems with predators, and 10 AG ecosystems without predators). NA indicates that the term was not included in the model.