Biology Commons^™

Finding The Sweet Spot: What Levels Of Larval Mortality Lead To Compensation Or Overcompensation In Adult Production?, Zoey R. Neale, Steven A. Juliano

Faculty Publications – Biological Sciences

Extrinsic mortality impinging on negative density-dependent populations can result in no change in the number of survivors (compensation) or an increase (overcompensation) by releasing the population from density-dependent effects on survivorship. The relationship between the level of extrinsic mortality (i.e., percentage of mortality) and the level and likelihood of overcompensation is theoretically important, but rarely investigated. We tested the hypothesis that overcompensation occurs below a threshold value of extrinsic mortality that is related to density-dependent mortality rate and that additive extrinsic mortality occurs above this threshold. This hypothesis predicts that survivorship vs. extrinsic mortality will (1) be best described by …

The Demographic And Life-History Costs Of Fear: Trait-Mediated Effects Of Threat Of Predation On Aedes Triseriatus, Geoffrey D. Ower, Steven A. Juliano

Faculty Publications – Biological Sciences

1. Predators alter prey populations via direct lethality (density-mediated effects), but in many taxa, the indirect nonlethal threat of predation may be almost as strong an effect, altering phenotypically plastic traits such as prey morphology, behavior, and life history (trait-mediated effects). There are costs to antipredator defenses and the strength of prey responses to cues of predation likely depends on both the perceived level of risk and food availability.
2. The goal of this study was to test the hypothesis that the costs of nonlethal trait-mediated interactions impacting larvae can have carryover effects that alter life-history traits, adult characteristics, and ultimately population …

Microplastic Prevalence In Two Fish Species In Two U.S. Reservoirs, William Perry, Catherine M. O'Reilly, Raven Hurt

Faculty Publications – Biological Sciences

No abstract provided.

How Do Trait-Mediated Non-Lethal Effects Of Predation Affect Population-Level Performance Of Mosquitoes?, Karthikeyan Chandrasegaran, Steven A. Juliano

Faculty Publications – Biological Sciences

Non-lethal, trait-mediated effects of predation impact prey behavior and life-history traits. Studying how these effects in turn influence prey demography is crucial to understand prey life-history evolution. Mosquitoes are important vectors that claim several million lives every year worldwide by transmitting a range of pathogens. Several ecological factors affect life-history traits of both larval and adult mosquitoes, creating effects that cascade to population-level consequences. Few studies have comprehensively explored the non-lethal effects of predation and its interactions with resources and competition on larval, adult, and population traits of mosquitoes. Understanding these interactions is important because the effects of predation are …