Life Sciences Commons^™

Overcompensation In Aedes Mosquitoes Populations: Field Tests On Likelihood And An Agent-Based Model To Investigate The Influence Of Cohort Structure, Katherine G. Evans

Theses and Dissertations

The number of individuals in a competitive environment can affect the growth rate, survival, size, and fecundity of those individuals, which is known as density-dependent effects. Overcompensation may occur if few juveniles survive to adulthood in a high-density environment. Overcompensation arises when density dependent survival interacts with extrinsic sources of mortality, such that more juveniles survive to adulthood than if no extrinsic mortality had occurred.

I tested the hypothesis that density dependent effects are common and strong in the field for three mosquito species: Aedes aegypti, Aedes albopictus, and Aedes triseriatus. I surveyed naturally occurring densities in novel and established …

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 …