Five Natural Hybrid Combinations in Minnows (Cyprinidae)

This concise study explores five naturally occurring hybrid pairings among North American minnows. The authors document crosses such as Chrosomus erythrogaster with Notropis cornutus frontalis and several others, all collected from small spring‑fed streams that endured a severe drought in the 1950s. The work links the unusual spawning crowding caused by low water levels and overgrazed watersheds to the increased chance of inter‑species fertilization.

Using standard ichthyological measurements, the researchers compare hybrid specimens to their parent species, noting traits like enlarged heads and intermediate jaw proportions. Detailed tables illustrate how dimensions shift toward one parent or the other depending on the ratio used. The paper offers a clear snapshot of how environmental stress can foster hybrid formation, providing useful baseline data for anyone interested in fish ecology or evolutionary biology.