In this study, we focus on the stability analysis of equilibrium points of population dynamics with delay when the Allee effect occurs at low population density is considered. Mainly, mathematical results and numerical simulations illustrate the stabilizing effect of the Allee effects on population dynamics with delay.

Differences in larval survival and development of bollworm, Helicoverpa zea (Boddie), and fall armyworm, Spodoptera frugiperda(J.E. Smith), respectively,were found toexist among commercially available Cry1A(c) transgenic Bacillus thuringiensis Berliner (Bt) varieties. Using a quantiÞcation assay (ELISA) to measure the levels of d-endotoxin in two of these varieties (ÔDP 451B/RRÕ and ÔNuCOTN 33B...

Variation in vital demographic (e.g., survival) rates of males can influence population dynamics, but the male segment of the population is frequently ignored in ecological studies of mammals. Using a multistate capture– mark–recapture model and 44 years (1962–2006) of data from 17 habitat patches, we investigated spatial and temporal variation in age-specific survival rates of male yellow-bell...

Current knowledge of the principles of population dynamics is unsatisfactory on both empirical and theoretical grounds. The main problems are a weak empirical base, overly simple models with but vague links to real systems, and little effective interplay between theory and experiment. We therefore believe there is a need for renewed emphasis on carefully controlled laboratory studies of populat...

Stock dynamics and demographic parameters of a family of annual icefishes (Salangidae) were investigated in Lake Nanyi in eastern China before and after construction of irrigation infrastructure. After hydroregulation, two of four icefish species, a migratory species (Hemisalanx brachyrostralis) and a previously rare species (Neosalanx tangkahkeii) were absent from survey samples. The relative ...

33 Begon, M. and Wall, R. (1987) Individual variation and competitor coexistence: a model, Funcf. Ecol. 1,237-241 Rogers, A.R. (1986) Population dynamics under exploitation competition, J. Theor. Biol. 119,363-368 Rogers, A.R. (1989) Resource partitioning and stability of population dynamics: a reply to Lomnicki and Sedziwy, J. Theor. Biol. 138, 545-549 Bjernstad, O.N. and Hansen, T.F. (1994) I...

Aznar, F. Javier, et al. 2001. Establishing the relative importance of sympatric definitive hosts in the transmission of the sealworm, Pseudoterranova decipiens: a host-community approach, pp. 161171 In: Geneviève Desportes and Gary McClelland, editors, Sealworms in the North Atlantic: ecology and population dynamics. North Atlantic Marine Mammal Commission, Tromso. NMML BOOK COLLECTION QL128 ....

Soliton rate equations are based on non-Kolmogorovian models of probability and naturally include autocatalytic processes. The formalism is not widely known but has great unexplored potential for applications to systems interacting with environments. Beginning with links of contextuality to nonKolmogorovity we introduce the general formalism of soliton rate equations and work out explicit examp...