Generally speaking, I was checking if the presence of animal carcasses could be determined based on the chemical composition of the soil. I know that in the context of ecological modeling and environmental data analysis, the moderate predictive power of models, as suggested by the R² values presented in my analysis (around 38%), is often considered acceptable. I used GLM. I am having trouble finding scientific articles to support this... I am only finding articles from the "social sciences". Can you help?