Disgust domains in the prediction of contamination fear: A comparison of Dutch and US samples

Environmental and individual determinants of fecal avoidance in semi-free ranging woolly monkeys (Lagothrix lagotricha poeppigii)

OBJECTIVES

Parasite selection pressures have driven the evolution of numerous behavioral defenses in host species, but recent studies revealed individual variation in their expression. As little is known about the factors causing heterogeneity among individuals in infection-avoidance behaviors, we investigated in woolly monkeys (Lagothrix lagotricha poeppigii) the influence of several environmental and individual characteristics on the tendency to avoid food contaminated by soil and by their own and conspecifics' feces.

MATERIALS AND METHODS

We conducted feeding tests on 40 semi-free ranging individuals rescued from the pet trade. Using generalized linear mixed models, we investigated the effect of season, sex, age, dominance rank, and exposure to non-natural living conditions on feeding decisions.

RESULTS

Woolly monkeys did not avoid soil-contaminated food and equally avoided food contaminated by their own and conspecifics' feces. Individuals varied greatly in their level of fecal avoidance. Only females exhibited strong avoidance of fecally contaminated food, but adapted their behavior to food availability, highlighting the trade-off between nutritional intake and parasite avoidance. Additionally, low-ranking females, less competitive over food resources, exhibited lower avoidance than dominant ones. Juveniles were more cautious than adults, possibly to compensate for a higher parasite susceptibility. Finally, we reported an unknown effect of exposure to non-natural living conditions on behavioral defenses, as animals kept as household pets for an extended period apparently lost their ability to avoid fecally contaminated food.

CONCLUSION

We argue that striving to understand variation in infection-avoidance behaviors in natural populations is crucial to predict disease spread and inform conservation policies.

Confirming the Three-Factor Structure of the Disgust Scale—Revised in Eight Countries

The current study evaluates the factor structure of the Disgust Scale—Revised (DS-R) in eight countries: Australia, Brazil, Germany, Italy, Japan, the Netherlands, Sweden, and the United States ( N = 2,606). Confirmatory factor analysis is used to compare two different models of the DS-R and to investigate the invariance of the factor structure of the DS-R across countries and gender. A three-factor solution consisting of three different but interrelated disgust factors (a 12-item core disgust factor, an 8-item animal-reminder disgust factor, and a 5-item contamination disgust factor) best accounted for the data in all countries except the Netherlands. Relative to the United States, the three-factor solution is invariant in Australia, Brazil, and Japan but not in Germany, Italy, the Netherlands, and Sweden. The three-factor solution is also invariant across gender in most countries. The implications of these cross-cultural findings for promoting a more valid and reliable assessment of disgust dimensions, as assessed by the DS-R, are discussed.