Before revision:  The form of this dependence varies with the precision of trade-offs and the presence of cross-feeding, immigration, or evolution .
After revision:  These changes in diversity are driven by an "early-bird" effect in which species specialized for nutrients that are initially more abundant gain a population advantage over other species. We explore the interplay of this effect with different environmental factors and diversity-supporting mechanisms, such as immigration and cross-feeding, immigration, or evolution .