Fig. 4: Variation in sperm concentration and bacterial taxa in the prepuce microbiomes of male black-footed ferrets (Mustela nigripes).

Ferrets were housed at two ex-situ facilities (FCC and NZCBI) and the wild (Conata) (n = 21). Sperm concentration varies across individual ferrets (a) and correlations with differentially abundant bacterial genera (as calculated by ANCOMBC) visualized with linear trendlines (b–e).