Results of two field experiments showed that selective removal of omnivorous mosquito larvae (Aedes triseriatus (Say)) functioning as top predators in the food web of a temperate, tree hole ecosystem resulted rapidly in increased abundance of flagellate and then ciliate populations. Flagellate density increased from <1 per ml to >103 per ml within 4 days of omnivore removal, followed shortly thereafter by an increase in ciliate density from <1 per ml to >102 per ml, after which flagellate density declined, and flagellate and ciliate densities stabilized. Rod-shaped bacteria increased slightly in density after removal of larval mosquitoes, then declined as protist density increased. Cocciform bacteria did not vary in density with these changes, thus the trophic cascade dampened at the remotest trophic level. Concomitant with the increase in protist densities, some bacteria formed elongated filaments >10 μm in length, likely an anti-predation, morphological response stimulated by suddenly intensified grazing as protozoan density rose. Results suggest that feeding by omnivorous mosquito larvae exhibited strong top-down effects on flagellate and ciliate populations, depressing them to below their equilibrium densities and nearly to extinction in tree hole ecosystems.
Authors:Glenn Geher, Scott Barry Kaufman, Justin R. Garcia, James C. Kaufman and Blair Bryant Dawson
Mating Intelligence (MI) is a hypothesized constellation of mental adaptations that generate adaptive strategies in human mating (Geher & Miller, 2008). Although past research has theoretically explored and empirically evaluated the construct, using a MI scale that was borne of the ideas from Geher and Miller’s work, this study seeks further understanding of this construct by demonstrating incremental validity. Two studies, each with large samples, demonstrate that MI predicts important outcomes beyond traditional conceptions of personality and intelligence. Exploratory factor analyses revealed that the factor structure suggested in previous work was generally congruent with predictions. Further, MI accounted for a significant portion of variance in mating success after controlling for age, the five-factor model of personality and general intelligence.