Toyokawa, W. （豊川航）(2017). Scrounging by foragers can resolve the paradox of enrichment. 捕食者による略奪行動が生物群集における富栄養化のパラドクスを解消する Royal Society Open Science, 4: 160830. doi:10.1098/rsos.160830
Intuition and experimental evidence suggests that increases in prey availability lead to increases in predator populations. However, theoretical models paradoxically suggest that increased prey can lead to instability in the predator-prey ecosystem and possible extinction. To resolve this paradox, I considered social interactions between predators. Some predators produce (find their own prey) and others scrounge (join in on their companions’ prey). I showed mathematically that when scrounging is prevalent, the ecosystem becomes stable and hence, the paradox disappears. My results highlight the importance of social interactions within group-living animals in maintaining stability of ecological communities.