Before revision:  We explore the interplay of this effect with different environmental factors and diversity-supporting mechanisms , such as immigration and cross-feeding, and find a variety of ensuing relationships between nutrient supply and diversity . The large variation seen in this simple model suggests that real ecosystems may not obey a single universal relationship between nutrient supply and diversity.
After revision:  We explore the interplay of this effect with different environmental factors and diversity-supporting mechanisms , such as immigration and cross-feeding, and find a variety of ensuing relationships between nutrient supply and diversity , suggesting that real ecosystems may not obey a single universal relationship between nutrient supply and diversity.