Sex ratio and dynamic behavior in populations of the exotic blowfly Chrysomya albiceps (Diptera, Calliphoridae)

Brazilian Journal of Biology

H. Serra²  Wac. Godoy²  Fj. Von Zuben¹  Cj. Von Zuben¹  Sf. Reis¹ 

[1] ,Universidade Estadual Paulista Instituto de Biociências Departamento de ParasitologiaBotucatu SP ,Brazil

关键词: density-dependent model;    population dynamics;    sex ratio;    modelo de dependência da densidade;    dinâmica populacional;    razão sexual;   

DOI  :  10.1590/S1519-69842007000200022

来源: SciELO

【 摘 要 】

Sex ratio is an essential component of life history to be considered in population growth. Chrysomya albiceps is a blowfly species with a naturally biased sex ratio. In this study, we evaluated the impact of changes in sex ratio on the dynamic behavior of C. albiceps using a density-dependent mathematical model that incorporated demographic parameters such as survival and fecundity. These parameters were obtained by exponential regression, with survival and fecundity being estimated experimentally as a function of larval density. Bifurcation diagram of the results indicated the evolution of stable equilibrium points as a function of sex ratio. A continually increasing sex ratio yielded a hierarchy of bifurcating stable equilibrium points that evolved into a chaotic regime. The demographic parameters obtained by exponential regression were also changed to maximum and minimum values in order to analyze their influence on dynamic behavior with sex ratio being considered as an independent variable. Bifurcations with periodicity windows between chaos regimes were also found.

【 授权许可】

CC BY   
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