The Role Of Fish Life Histories In Allometrically Scaled Food-Web Dynamics
This R code inputs the simulation output and reformats it into tidy data (Wickham 2014), as contained in clean_2018May03_1.zip. It also creates colnames_clean_2018May03_1.txt, which stores the column names for the data sets. (2.963Kb)
colnames_clean_2018May03_1.txt contains the column names for all the data sets. This is called by Appendix_Analysis.R. (185bytes)
clean_2017Nov28_0.zip contains the compressed text file for the complete simulation results, both phase 1 and phase 2. (790.4Mb)
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Body size determines key ecological and evolutionary processes of organisms. Therefore, organisms undergo extensive shifts in resources, competitors and predators as they grow in body size. While empirical and theoretical evidence show that these size-dependent ontogenetic shifts vastly influence the structure and dynamics of populations, theory on how those ontogenetic shifts affect the structure and dynamics of ecological networks is still virtually absent. Here, we take a first step towards generating such theory by developing an Allometric Trophic Network (ATN) model that incorporates size-structure in the population dynamics of fish species within complex food webs. Our preliminary results show that fish with larger allometric ratios attain higher biomass and tend to be correlated with greater ecosystem stability. We also find that that fish with a larger asymptotic body mass tend to be correlated with a larger total ecosystem biomass, a result that holds true across models for both the largest fish in the ecosystem and each fish species in the ecosystem. The approach adopted here offers a potentially instructive means of disentangling the effects of increasing life-history complexity in food-wed models.